JPH0679969A - Color display member - Google Patents

Abstract

PURPOSE:To make it possible to provide the clear contrast of colors, to make the thickness thin, to achieve light weight and to improve conveying property by constituting a thermochromic layer by regularly arranging thermochromic materials, which repeat the coloring and fading of blue, green and red, respectively. CONSTITUTION:A thermochromic layer 1, whose heating is controlled by the current conduction, is held between intersecting stripe electrodes 2 and 2'. which are provided so as to face each other. In the thermochromic layer 1, thermochromic materials 1B, 1G and 1R, which perform the coloring of blue (B), green (G) and red (R), are regularly arranged at the intersecting positions of the facing electrodes 2 and 2'. This state indicates the mosaic alignment. When the thermochromic materials 1B, 1G and 1R are made to be the round shape or the cylindrical shape and the colors are arranged, the part other than the round-shaped thermochromic material is the heat resisting, or colored or transparent resin or pneumatic layer. Especially, when the pneumatic layer is provided, the diffusion of heat between the thermochromic materials is prevented, and the bleeding of the colors is less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention forms a color recording material in which the visible color state of the recording material changes with temperature in the form of a sheet.
The present invention relates to a color display member of a flat color panel for printers, fax machines and other information devices.

[0002]

2. Description of the Related Art Conventionally, flat color panel display devices for displaying numbers, letters, kana, and simple figures include light emitting diodes (LED), plasma (PDP), fluorescent display tubes (VDF), liquid crystals (LCD), Ferroelectric liquid crystal (FLCD)
It is or is about to be put into practical use. In addition, a thermochromic material that visually changes between white turbidity and transparency depending on temperature is sandwiched between electrodes to cause visible change by Joule heat. Japanese Patent Application Laid-Open No. 2-414438 discloses a display body in which a colored layer is provided and the colored portion is changed to white turbidity or transparency.

[0003]

In the above-mentioned prior art, the display device using the LED, PDP, VDF, LCD, FLCD, etc. requires a special equipment such as a clean room and crystal growth when manufacturing members, elements and the like. Not only is it necessary and costly to manufacture, but also as a product, when the display member is a PDP between glass plates, a gas that emits light, LC
In the case of D and FLCD, it is necessary to enclose a liquid that emits light to maintain the parallelism of the glass plate, and in the case of VDF, it is necessary to maintain the degree of vacuum. It is not easy to secure the damage and display characteristics against impacts, and there is a problem in that the weight increases due to the use of the glass plate. In addition, the writing characteristics are constant in the method of Joule heating by a heating element in which a thermosensitive recording material whose light transmittance changes reversibly changes with temperature and a coloring layer, but the writing characteristics are constant, but the turbidity and the transparency of the thermosensitive recording layer vary depending on the temperature. Since the colors are displayed through the layers, the color lacks in vividness.

[0004]

For the purpose of solving the above-mentioned problems, a thermochromic material in which blue, green, red coloring and decoloring are repeated by temperature changes without using LEDs, PDPs, VDFs, LCDs, FLCDs and the like. The thermochromic layer consisting of 3 colors is arranged in 3 rows in the horizontal direction and 3 rows in the vertical direction, and 3 colors in the horizontal and vertical directions are repeated one by one. Or the like, or the thermochromic material of each color is formed into a round shape or a cylindrical shape with such an arrangement of three colors, and the remaining portion is colored or is made of a transparent heat-resistant material. The color-developing thermochromic material of the thermochromic layer which is covered with a resin or is an air layer is provided at the intersecting positions of the intersecting striped electrodes which are provided so as to face each other, or this division of the flat electrode and the split electrode group which are provided so as to face each other electrode By arranging it underneath, controlled electric current is applied between the electrodes to repeatedly develop and decolor each color of the thermochromic layer, which enables writing and erasing with good thermal efficiency, and the rule of blue, green and red. The present invention has been completed because the color developed by the dynamic arrangement can be vividly revealed.

The invention of claim 1 is a case where the thermochromic layer has sufficient resistance and can generate heat by energization by the electrodes. That is, a thermochromic device in which heat generation is controlled by energizing the flat electrodes and the divided electrode groups, which are provided so as to be opposed to each other, or between the flat plate electrodes and the divided electrode groups, which are provided so as to be opposed to each other, by the control device. The layers are sandwiched, and this thermochromic layer is formed by regularly arranging thermochromic materials that repeat coloring and decoloring in blue, green, and red, respectively, and a thermochromic material that develops in each color is formed between the stripe electrodes. It is a color display member characterized by being arranged at a crossing position or below a divided electrode group. The invention of claims 2 to 4 is a low resistance body in which the thermochromic layer does not function as a resistance body, or when the power consumption is large to generate heat from this material, a heating body is separately energized for use,
This is a form in which the thermochromic layer is colored and decolored by the controlled heat generation. According to a second aspect of the present invention, a heating element layer whose heat generation is controlled by a control device and a thermochromic layer are superposed and sandwiched between the flat plate electrode and the divided electrode group which are provided so as to face each other, and the thermochromic layer is blue. ,
A color characterized in that a thermochromic material that repeats coloring and decoloring in green and red is arranged regularly, and the thermochromic material that develops in each color is arranged under the divided electrode group. It is a display member. According to a third aspect of the present invention, a heating element layer whose heat generation is controlled by a control device is sandwiched between intersecting striped electrodes provided to face each other or between flat plate electrodes and split electrode groups provided to face each other, This heating element layer is provided with a thermochromic layer via a stripe electrode or a group of divided electrodes, and this thermochromic layer is formed by regularly arranging thermochromic materials that repeat coloring and decoloring in blue, green and red, respectively. The color display member is characterized in that the thermochromic material that develops each color is arranged at the intersecting position between the stripe electrodes or above the divided electrode group. According to a fourth aspect of the invention, a heating element and blue whose heat is controlled by a control device are provided between intersecting stripe electrodes provided to face each other or between flat plate electrodes and split electrode groups provided to face each other.
Green and red are colored and decolored repeatedly.A thermochromic material that is colored separately is adhered to the body.Blue, green and red thermochromic materials that are colored separately are formed at the crossing positions between the striped electrodes or in the divided electrode group. It is a color display member characterized by being arranged at the bottom. The invention of claim 5 is
A thermochromic material that repeats coloring and decoloring in blue, green, and red is mainly composed of a color former and a developer, and the color former is a triphenylmethanephthalide compound, a fluoran compound,
Phenothiazine compounds, leuco auramine compounds,
5. The compound selected from indinophthalide compounds, wherein the developer is a compound selected from long-chain alkylphosphonic acid, long-chain alkylmalonic acid, and long-chain alkylmalic acid. Is a color display member. The invention of claim 6 is characterized in that the temperature range of coloring and erasing by temperature of the thermochromic material that repeats coloring and erasing in blue, green and red has a common temperature range. The color display member according to any one of the above. Claim 7
Invention, the temperature range of color development of each thermochromic material is
7. The color display member according to claim 6, wherein the temperature range is 100 ° C. to 180 ° C. and the erasing temperature range is 60 ° C. to 90 ° C. According to the invention of claim 8, when the thermochromic material that repeatedly develops and erases colors of blue, green and red is in a decolored state, each color is in a white state and the reflection density is 0.10 to 0.50. The color display member according to any one of items 1 to 7. According to the invention of claim 9, the means for controlling heat generation of the heating element or the thermochromic material applies a plurality of pulse voltages within the pulse application time, and the heat generation control on the high temperature side is shorter than the heat generation control on the low temperature side. It is a color display member in any one of Claims 1-8 performed by making a pulse voltage high.

The thermochromic material of the present invention, which repeats coloring and decoloring in blue, green and red, mainly comprises a color former and a developer, and the color former is a triphenylmethanephthalide compound, a fluoran compound, It is selected from phenothiazine compounds, leuco auramine compounds, indinophthalide compounds and the like. The color-developing agent that develops blue color is 3,3-bis (p-dimethylaminophenyl) phthalide, 3,3-bis (p-dimethylaminophenyl)-
6-dimethylaminophthalide, 3,3-bis (p-dimethylaminophenyl) -6-diethylaminophthalide and the like can be mentioned, and the color-developing agent that develops green color is 2-dibenzylamino-
6-diethylaminofluorane, 2-dibenzylamino-
4-methyl-6-diethylaminofluorane, 2-dibenzylamino-6- (di-n-butylamino) fluorane, 2-
Anilino-6- (di-n-hexylamino) fluorane, 2
-Anilino-6- (N-ethyl-p-toluidino) fluorane and the like can be mentioned, and the color developing agent which develops in red color is 1-methyl-3-
Methyl-6- (di-n-amylamino) fluorane, 1-methyl-3-methyl-6- (di-n-butylamino) fluorane, 2-methyl-6- (di-n-butylamino) fluorane, 2 -Methyl-6- (N-cyclohexyl-Nn-amylamino) fluorane, 2-methyl-6- (N-ethyl-p-toluidino) fluorane, 1,2-benzo-6- (N-ethyl)
-N-isoamylamino) fluorane and the like.

The color developer is selected from long-chain alkylphosphonic acid, long-chain alkylmalic acid, long-chain alkylmalonic acid and the like. And long-chain alkylphosphonic acid is dodecylphosphonic acid, tetradecylphosphonic acid, hexadecylphosphonic acid, octadecylphosphonic acid, eicosylphosphonic acid, docosylphosphonic acid, tetracosylphosphonic acid, hexacosylphosphonic acid, octacosylphosphonic acid. Luphosphonic acid and the like can be mentioned. Long-chain alkylmalic acid, dodecylmalic acid, tetradecylmalic acid, hexadecylmalic acid, octadecylmalic acid, eicodecylmalic acid, docosylmalic acid, tetracosylmalic acid, dodecylthiomalic acid, tetradecylthiomalic acid, Hexadecylthiomalic acid, octadecylthiomalic acid, eicosylthiomalic acid, docosylthiomalic acid, tetracosylthiomalic acid, dodecyldithiomalic acid, tetradecyldithiomalic acid, hexadecyldithiomalic acid, octadecyldithiomalic acid , Eicosyldithiomalic acid, docosyldithiomalic acid, tetracosyldithiomalic acid and the like. Long-chain alkylmalonic acid, dodecylmalonic acid, tetradecylmalonic acid, hexadecylmalonic acid, octadecylmalonic acid, eicosylmalonic acid, docosylmalonic acid, tetracosylmalonic acid, didodecylmalonic acid,
Ditetradecylmalonic acid, dihexadecylmalonic acid, dioctadecylmalonic acid, dieicosylmalonic acid, didocosylmalonic acid, methyloctadecylmalonic acid, methyleicosylmalonic acid, methyldocosylmalonic acid, methyltetracosylmalonic acid, Examples thereof include ethyl octadecyl malonic acid, ethyl eicosyl malonic acid, ethyl docosyl malonic acid and ethyl tetracosyl malonic acid. These color-developing agents and color-developing agents are appropriately selected so that the colors are blue, green and red, and these are selected from polyester, polyamide, polyacrylate, polymethacrylate, polystyrene, silicone resin, polyvinyl chloride, vinyl chloride-acetic acid. It is composed of a binder resin such as a vinyl copolymer, a vinylidene chloride-vinyl chloride copolymer, or a vinylidene chloride-acrylonitrile copolymer. When the layer is formed of the above materials, the resistance value is almost determined by the binder resin. Therefore, a binder for reducing the resistance is dispersed in the resin. A method of uniformly dispersing the binder in the resin layer,
By arranging needle-shaped binders in the electrode direction, a layer structure having anisotropic resistance characteristics can be formed. Carbon particles, needle-shaped magnetic metal materials, and the like can be used as the binder. The particles and needle-shaped binders can be colored and then mixed with the binder resin to improve the visual characteristics.

This thermochromic material reversibly repeats coloring and decoloring depending on temperature. FIG. 1 is a diagram showing decolorization and color development of this thermochromic material. The vertical axis represents the decolored and colored state, and the horizontal axis represents the temperature at which the thermochromic material is heated. First, the material in the decolored state D
When the temperature rises from room temperature to T ₂ after passing through the temperature T ₁ , the material is in the coloring state B. Even when the material in the color-developed state is cooled to room temperature, the color-developed state is maintained and the color-developed state C is obtained. When the material in the colored state C is heated from around room to temperatures T ₁ passes through the temperature T ₀ at a temperature T ₀ or less, the decolorized state D lowers the concentration with a broken line state. When the temperature of this material is lowered to room temperature, the decolored state D is maintained, and when the temperature is raised from T ₁ to T ₂ again, the material becomes the colored state B again, and even when the temperature of this material is lowered to room temperature, the colored state C is maintained. To be done. Thus, the thermochromic material is repeatedly colored and decolored depending on the temperature. In the present invention, this coloring temperature range is 100 to 1
It is preferable that the temperature is 80 ° C and the erasing temperature range is 60 to 90 ° C. It is preferable that the thermochromic materials have the same temperature range for coloring and decoloring.

The color display member of the present invention has a mechanism in which the above thermochromic material is heated to develop blue, green, or red of the same material or to repeat decoloring. In this case, as a heating means, the same material is sandwiched between electrode groups provided so as to face each other, and heat is generated by controlling the energization of the electrodes to control the material at a predetermined temperature. To control this heat generation, a plurality of pulse voltages are applied within the pulse application time, and the heat generation control on the high temperature side is performed by making the pulse application time shorter and increasing the pulse voltage than the heat generation control on the low temperature side. The electrode groups facing each other used in the present invention, stripe electrodes are provided so as to be orthogonal to each other,
One of the electrodes is a flat plate electrode, and the opposite electrodes are provided as a divided electrode group.By the opposing electrodes, blue, green, and red are repeatedly colored and decolored. The thermochromic material is heated locally or through a heating element. Any electrode will do. This thermochromic material layer is a thermochromic material in which the constituent materials containing the above-mentioned color former, developer and binder as main components are dispersed in a solvent to repeatedly develop and decolorize blue, green and red. 1 at the crossing or position of the intersecting striped electrodes provided to face each other or below the divided electrode group.
It is formed by applying an appropriate method such as a screen printing method, a spray method, or a wire bar method on the electrode group or between the electrodes so that they are regularly arranged color by color.

If the above-mentioned thermochromic material layer is a low resistance material that does not function as a resistance material, or if the power consumption is large to generate heat from this material, a thermoelectric material may be used by energizing separately. Generates heat in the chromic material layer. Various structures are adopted as the structure for causing the thermochromic material to generate heat by the heat generated by the heating of the heating element. 1. A structure in which the thermochromic material layer and the heating element layer described above are superposed and sandwiched between opposed electrode groups (the invention of claim 2). 2. A structure in which a heating element layer is sandwiched between opposed electrode groups and a thermochromic material layer is provided on the upper surface thereof (the invention of claim 3). 3. Adhere the thermochromic material and the heating element,
A structure in which a thermochromic material that repeats coloring and decoloring of green and red and another thermochromic material of a heating element are formed and sandwiched between opposing electrode groups (the invention of claim 3). The structure of is adopted. In the configuration in which the thermochromic material layer is sandwiched between the electrode groups and the configurations 1 to 3 described above, one coloring area of each color is larger than the area where heat is generated, that is, the area of the electrode groups facing each other, so that the energization time is increased. Since the area where heat is diffused by control is changed, the area that causes a visible change is changed, and gradation can be expressed.

The material of the heating element layer used in the present invention is a metal boride such as lanthanum, vanadium, chromium, molybdenum, titanium, tantalum, hafnium and zirconium. Other examples include tantalum-SiO ₂ mixture, tantalum nitride, nichrome, silver-palladium alloy, and silicon semiconductor. These are formed into a desired shape by vapor deposition or sputtering to produce a heating element layer. Also, by coating a thin layer of resin in which carbon is dispersed, a heating element layer can be obtained. In addition, indium oxide (I
TO) can also be used as a transparent heating element layer. It is also possible to form a thin heating element layer by using metal such as nickel chrome or stainless steel by electrodeposition or a metal foil, or to use a ceramic semiconductor obtained by adding a trace amount of a rare earth element and baking it in a furnace as a thin heating element layer.

[0012]

In the above invention, the invention of claim 1 is such that a thermochromic layer is sandwiched between stripe electrode groups or flat plate electrodes and split electrode groups which are provided facing each other and intersect each other.
When electricity is applied between the electrodes by the control device, heat generation of the thermochromic layer at the intersecting position where the stripe electrodes face each other or the contact position of the divided electrode group is controlled. In that case, a thermochromic material that repeatedly develops and erases colors of blue, green, and red is applied to the intersecting positions of the intersecting striped electrodes or the contact positions of the divided electrode groups, which are provided facing each other, one color at a time. Therefore, it is possible to perform vivid color display by coloring and erasing blue, green, and red, respectively, under the temperature controlled by the energization of the electrodes. According to a second aspect of the present invention, a thermochromic layer and a heating element layer are overlapped and sandwiched between intersecting striped electrode groups or flat plate electrodes and divided electrode groups which are provided so as to face each other. When energized, the heat generation of the heating element layer at the intersecting position of the stripe electrodes or the contact position of the divided electrode group is controlled, and the portion of the thermochromic layer in contact with the heating portion of the heating element layer is blue,
Repeats coloring and erasing on green and red, respectively. According to a third aspect of the present invention, the heating element layer is sandwiched between the intersecting striped electrode groups that are provided to face each other or the flat plate electrodes and the split electrode groups that are provided to face each other, and electricity is energized by the control device between the electrode groups. Then, the heat generation of the heating element layer sandwiched between the intersecting positions of the striped electrode groups facing each other or the part where the divided electrodes are in contact is controlled, and the electrode group is sandwiched and provided on the opposite side of the heating element layer. The portion of the thermochromic layer that is in contact with the heat generating portion of the heating element layer of the thermochromic layer is blue,
Repeats coloring and erasing on green and red, respectively. According to a fourth aspect of the present invention, between the striped electrode groups or the flat plate electrodes and the divided electrode groups which are provided so as to face each other, the body portion of the heating element is repeatedly colored and erased in blue, green and red for each color. When the thermochromic material in which the thermochromic layer is adhered is sandwiched between the electrodes facing each other and the electrodes are energized by the control device,
The heating element of each thermochromic material generates heat, and the thermochromic material repeatedly develops and erases colors of blue, green, and red, respectively.

[0013]

EXAMPLES Examples of the present invention are shown in FIGS. The present embodiment will be described with reference to these drawings.

Embodiment 1 In FIG. 2, FIGS. 2A and 2B are a perspective view and a sectional view showing the outline of the basic shape of the display member of this embodiment. Figure 2a shows
The intersecting stripe electrodes 2 provided so as to face each other with the thermochromic layers 1 whose heat generation is controlled by energization
Clap between 2 '. In the thermochromic layer 1, thermochromic materials 1B, 1G and 1R which develop blue (B), green (G) and red (R) are regularly arranged at the intersecting positions of the electrodes 2 and 2'which face each other. This state shows a mosaic arrangement as shown in Figures 3a and 3b. Figure 3c shows thermochromic material 1
In the example in which B, 1G, and 1R are formed in a round shape or a cylindrical shape and each color is arranged, a portion other than the round thermochromic material is a heat-resistant or colored or transparent resin or an air layer. In particular, if an air layer is used, heat diffusion between thermochromics can be prevented, and color bleeding is small.

In the following examples, when the thermochromic layer does not function as a resistor or the power consumption for heat generation is large, the thermochromic layer is repeatedly colored and decolored by the heating element layer which generates heat upon energization. is there.

Example 2 As shown in FIG. 4, the thermochromic layer 1 and the heating element layer 5
Is a display member sandwiched between a divided electrode group 4 and a single-plate electrode 3 that are formed by overlapping. In this case, since the thermochromic layer 1 functions as an electrode, the one plate electrode 3 and the divided electrode group 4 are used as the electrodes facing each other. FIG. 4 is a perspective view of this display member. In FIG. 4, a heating element layer 5 that generates heat when energized
And a blue, green, and red color are arranged as shown in FIGS. 3a, 3b, and 3c, a thermochromic layer 1 made of a thermochromic material is overlaid, and the blue, green, and red thermochromic materials 1B of the thermochromic layer 1 are stacked. , 1G, 1R, the display member is in contact with each of the divided electrodes 4. A pulsed power supply 6 is energized between the divided electrode group 4 and the single-plate electrode 3 to generate heat at a contact portion between the electrode 4 and the heat generating layer 5, and to generate the color of the thermochromic layer 1 in contact therewith. Material 1B, 1G, 1R
Repeats coloring and erasing.

Embodiment 3 As shown in FIG. 5, a heating element layer 5 which generates heat when energized is sandwiched between intersecting striped electrodes 2 and 2'opposed to each other, and one of the electrodes 2 ' On the opposite side of the heating layer 5, the blue, green, and red coloring thermochromic materials are arranged on the thermochromic layer 1 as shown in FIGS. This is a display member in which thermochromic materials 1B, 1G, and 1R that repeat these coloring and decoloring are arranged at positions.

Embodiment 4 As shown in FIG. 6, a heating element layer 5 which generates heat by energization is sandwiched between intersecting striped electrodes 2 and 2 ′ provided so as to face each other, and either one of the electrodes 2 is provided. ', And each of the blue, green and red coloring thermochromic materials is arranged on the opposite side of the heating element layer 5 as shown in FIGS. 3a, 3b and 3c. These colored thermochromic materials 1B, 1G,
1R is arranged, and a white or black colored layer 7 is further provided below the thermochromic layer 1 to provide a display member. When the colored layer is provided between the electrode 2 and the thermochromic layer 1, the color development of the thermochromic layer can be clearly seen.

Embodiment 5 As shown in FIG. 7, the heating element layer 3 and the thermochromic material 1 which generate heat when energized are provided in the same thickness between the intersecting striped electrodes 2 and 2 ′ provided so as to face each other. It is formed and provided in close contact with the body portion of the heating element layer 3.
Then, the adhered body of the thermochromic material and the heating element layer uses 1B, 1G, 1R of the thermochromic material which repeats coloring, decoloring of any one of blue, green and red,
One at each crossing position of the stripe electrodes 2 and 2 ', FIG.
Arrange like 3b and 3c.

Embodiment 6 As shown in FIG. 8, the thermochromic material 1 is formed into a cylindrical shape at the center of the heating element layer 5 which generates heat by energization between the intersecting striped electrodes 2 and 2'provided to face each other. 1B, 1 of thermochromic material which is molded and repeats coloring, erasing of any one of blue, green and red
G and 1R are used and arranged one by one at the crossing positions of the stripe electrodes 2 and 2'as shown in FIGS. 3a, 3b and 3c.

Embodiment 7 This embodiment is a perspective view, a sectional view, and a control block diagram showing an example in which color control is performed by a control device for a color display member of the present invention. In FIG. 9, crossing stripe electrodes 2 and 2'provided to face each other, 2 is an X address electrode, 2'is a Y address electrode, and a heating element layer 3 which generates heat by energization is sandwiched between these electrodes. , Y address electrode 2 '
Then, the thermochromic layer 1 having the arrangement shown in FIG. 3a is placed so that each color-developing thermochromic material is arranged in a color at the intersection of the electrodes 2 and 2 '. The orthogonal stripe electrodes 2 provided to face each other are X address electrodes, 2'is a Y address electrode, and a control signal from a CPU including an output circuit, a ROM and a processing circuit is passed through the Y address selection circuit to the Y address electrode 2 'To X through the X address selection circuit
A voltage is applied to the address electrode 2 in the thickness direction of the heating element layer 3 between the intersections of arbitrary electrodes, and electricity is applied. Then, that portion generates heat. The heat generation can be controlled by the amount of current for energization and the energization time. The applied voltage is a pulse voltage, and a plurality of pulses are given. The temperature at which each color of the thermochromic layer is decolorized is lower than the temperature at which it is colored, but at the time of decoloring, a voltage lower than the pulse voltage for color development, and applying a large number of pulses or a long period of time ensures more reliable decolorization. Can be A plurality of temperature detectors 7 are provided on the surface of the thermochromic material, and the temperature is fed back to the heating element layer for controlling the amount of current and the duration of current flow depending on the detected temperature, and optimal color development and decolorization are performed. .

The thermochromic layer used in each of the above examples, which repeatedly develops and erases colors of blue, green and red, is prepared as follows. All parts are parts by weight. 1-Methyl-3-methyl-6- (di-n-amylamino) fluorane 3 parts Octadecylphosphonic acid 9 parts Vinyl chloride-vinyl acetate copolymer (VYHH, Union Carbide) 10 parts Toluene 45 parts Methyl ethyl ketone 45 parts The composition liquid is pulverized with a ball mill to a particle size of 1 μ to 4 μ,
A thermochromic material that is dispersed and repeats coloring and erasing in red is obtained. 3,3-Bis (p-dimethylaminophenyl) phthalide 3 parts Octadecylphosphonic acid 9 parts VYHH 10 parts Toluene 45 parts Methyl ethyl ketone 45 parts are obtained in the same manner as above to obtain a thermochromic material that repeatedly develops and disappears in blue. 2-Dibenzylamino-6-diethylaminofluorane 3 parts Octadecylphosphonic acid 9 parts VYHH 10 parts Toluene 45 parts Methyl ethyl ketone 45 parts are obtained in the same manner as described above to obtain a thermochromic material that repeatedly develops and disappears in green color. Each thermochromic material obtained as described above is applied by a screen printing method so that each material is regularly arranged as shown in FIG. 2A to form a film having a layer thickness of 5 μm to 15 μm. This thermochromic layer starts to develop color at a color development temperature of 100 ° C. or higher, and a maximum density is obtained at 120 to 180 ° C. The erasing temperature is 60 to 90 ° C, and the minimum density is 70 to 80 ° C. The color density of each color is measured by a reflection densitometer, blue is 1.0 to 1.5, green is 1.3 to 1.8, and red is 1.5 to 1.5.
It will be 2.0. The reflection density of each color at the time of erasing becomes 0.15 to 0.5, and the heating method for erasing can be made to be 0.2 to 0.3 by the method of Example 7.

[0023]

In the color display member of the present invention, the thermochromic layer is made to develop into three colors of blue, green and red, and further, the arrangement of the colors is regularly constructed, and each color portion is colored by heat generation. The colors are vividly compared. In the inventions of claims 1 and 2, the electrodes sandwich the thermochromic layer,
Since a glass substrate or the like is not used to hold the electrode and the thermochromic layer, the thickness and thickness can be reduced, and even if dropped, it is not damaged and is advantageous in transportability. In addition, a low-cost manufacturing method can be adopted for forming the electrode and the thermochromic layer. Particularly, in the invention of claim 1, since the thermoceramic layer is heated by direct energization, the thermal efficiency is good and the power consumption for writing is small. Furthermore, power consumption for holding the written information is not necessary, and a flat color display can be achieved with further power saving. Further, since the information written in the thermochromic type is a light receiving type, it has an advantage that visual fatigue is small unlike the light emitting type. In the inventions of claims 3 and 4, since the heating element layer and the thermochromic layer are separated, the functions of both are separated, and it is possible to select the optimum materials that match each other's functions. There is an advantage that a flat color display excellent in high speed can be obtained. According to the invention of claim 5, a flat color display excellent in color rendering can be obtained by employing a thermochromic material with a color-developing agent that develops blue, green and red and a specific developer. According to the inventions of claims 6 and 7, by adjusting the temperature characteristics of writing and erasing of the thermochromic material of each color, control by energization can be simplified and a flat color display excellent in high speed can be obtained. In the inventions of claims 8 and 9,
Since the afterimage of the previous information recorded on the thermochromic material of each color is not left, the screen is easy to see. Also, in order to control the heat generation of the heating element, multiple pulse voltages are applied within the pulse application time, and the heat generation control on the high temperature side is shorter than the heat generation control on the low temperature side. And a constant color density such as storage temperature, elapsed time, and number of repetitions can be obtained to provide a high-contrast color display of image quality. It has various industrial effects such as.

[Brief description of drawings]

FIG. 1 is a decolorization of a thermochromic material used in the present invention,
It is a figure which shows the visualization degree with respect to the temperature which repeats coloring.

FIG. 2A is a schematic perspective view showing the first embodiment of the present invention, and b is a vertical sectional view of a.

FIG. 3 is a drawing showing blue, green, red color development and material arrangement of the thermochromic layer of the present invention.

FIG. 4 is a schematic perspective view showing a second embodiment of the present invention.

FIG. 5 is a schematic perspective view showing a third embodiment of the present invention.

FIG. 6 is a schematic perspective view showing Embodiment 4 of the present invention.

FIG. 7 is a schematic view showing the shape of a thermochromic material of Example 5 of the present invention.

FIG. 8 is a schematic view showing the shape of a thermochromic material of Example 6 of the present invention.

FIG. 9 is a schematic partial cross-sectional perspective view showing a seventh embodiment of the present invention and a block diagram of a control mechanism.

[Explanation of symbols]

 1 Thermochromic layer 1R Thermochromic material that develops red 1G Thermochromic material that develops green 1B Thermochromic material that develops blue 2 2'Stripe electrode 3 Plate electrode 4 Split electrode 5 Heating element layer 6 Pulse power supply 7 Coloring Layer 8 Temperature detector 9 Substrate

Claims (9)

[Claims] 1. Heat generation is controlled by energizing the electrodes between a plurality of intersecting stripe electrodes provided facing each other or between the flat electrode and the split electrode group provided facing each other by the controller. The thermochromic layer is sandwiched, and the thermochromic layer is formed by regularly arranging thermochromic materials that repeat coloring and erasing in blue, green, and red, respectively, and the thermochromic material that develops in each color is striped. A color display member, which is arranged at a crossing position between electrodes or below a divided electrode group. 2. A heating element layer whose heat generation is controlled by a control device and a thermochromic layer are superposed and sandwiched between a flat plate electrode and a divided electrode group provided facing each other, and the thermochromic layer is blue and green. , Thermochromic materials that repeat coloring and erasing in red are arranged regularly,
A color display member, wherein a thermochromic material that develops each color is arranged below the divided electrode group. 3. A heating element layer whose heat generation is controlled by a control device is sandwiched between intersecting stripe electrodes provided so as to face each other or between a flat plate electrode and a divided electrode group provided so as to face each other, and one of A thermochromic layer is provided on the opposite side of the heating element layer via a striped electrode or a divided electrode group, and this thermochromic layer regularly arranges thermochromic materials that repeat coloring and decoloring in blue, green and red, respectively. The color display member is characterized in that the thermochromic material that develops each color is arranged at the intersecting position between the stripe electrodes or above the divided electrode group. 4. A heating element whose heat generation is controlled by a control device between crossing stripe electrodes provided to face each other or between flat plate electrodes and split electrode groups provided to face each other and blue, green and red. Adhesion of thermochromic material that develops color repeatedly and decoloring to each other is adhered to the body part.The thermochromic material that develops blue, green and red separately is arranged at the crossing position between the stripe electrodes or below the divided electrode group. A color display member characterized by the following. 5. A thermochromic material that repeats coloring and decoloring in blue, green, and red is mainly composed of a color former and a developer.
The color former is a compound selected from triphenylmethane phthalide compounds, fluoran compounds, phenothiazine compounds, leuco auramine compounds, and indinophthalide compounds, and the developer is a long-chain alkylphosphonic acid,
The color display member according to claim 1, wherein the color display member is a compound selected from long-chain alkylmalonic acid and long-chain alkylmalic acid. 6. The temperature range of coloring and erasing depending on the temperature of the thermochromic material which repeats coloring and erasing in blue, green and red has a common temperature range. The described color display member. 7. The thermochromic material has a coloring temperature range of 100 ° C. to 180 ° C. and a decoloring temperature range of 60 ° C. to 90 ° C.
7. The color display member according to claim 6, wherein 8. When the thermochromic material that repeatedly develops and erases colors of blue, green and red is in a decolored state, each color is in a white state and has a reflection density of 0.10 to 0.50.
7. The color display member according to any one of 7. 9. A heating element or a means for controlling heat generation of a thermochromic material applies a plurality of pulse voltages within a pulse application time, and the high temperature side heat generation control has a shorter pulse application time than the low temperature side heat generation control. The color display member according to any one of claims 1 to 8, wherein the color display member is formed by increasing the height.