JP2004093789A - Display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display panel having a display function by which display/ erasure are performed by applying external force to an inclusion and display/erasure can be repetitively utilized and capable of preventing deformation of a surface plate by expansion and contraction of the inclusion due to the difference of temperature of surroundings. <P>SOLUTION: The display panel having a closed multi cellular structure including the display function by which display/erasure can be repetitively utilized and consisting of the surface plate, a rear surface plate and partitions and a supporting plate disposed on the side opposite to the surface plate of the display panel is characterized in that a weak adhesive agent or an adhesive medium having specified adhesive force is used in a method for joining the rear surface plate and the supporting plate. A further satisfactory effect can be obtained by e.g. making the thickness of the rear surface plate thinner than the thickness of the surface plate. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel having a display function that allows display / erasure to be formed by applying an external force to inclusions and that can be used repeatedly and repeatedly. The present invention relates to a display panel capable of preventing deformation of a face plate.
[0002]
[Prior art]
Some display panels that have been used in the past have various display functions that allow display / erasure to be used repeatedly. Although there are various structures, a structure having a sealed multi-cell structure including a front plate, a back plate, and a partition wall having a display function, and a structure having a sealed multi-cell structure by microcapsules are often used. Even if the display panel has a multi-cell structure, the display panel itself is often thin, and usually, a support plate is closely attached to a back plate to reinforce the display panel. Further, as proposed in International Publication WO01 / 5018841, a fine particle-shaped magnetic display material having different magnetic pole colors is dispersed in a dispersion medium having a yield value and containing a dispersion medium and a thickener as main components. In the case of a magnetic inversion type display panel using a magnetic material inversion display function, it is known that if a magnetic flux concentration member such as an iron plate is used as a support plate to concentrate magnetic flux, the display / erasing effect is improved. Most of the magnetic reversal type display panel uses a magnetic flux concentration member.
[0003]
Conventionally, since the bonding method between the back plate and the support plate of the display panel has been bonded using an adhesive such as SBR for reasons of workability, drying property, etc., the back plate and the support plate have been firmly bonded. On the other hand, the display panel has a problem that the ambient environmental temperature changes remarkably in the manufacturing stage and in the use environment, and the surface plate is deformed due to the expansion and contraction of the inclusion due to the difference in temperature. Was. In other words, the multi-cell structure is closed and the inclusions are sealed, but when the surroundings become hot, the inclusions expand and are mainly made of transparent resin to support transparency. The front plate and the back plate are flexible and the cells are enlarged as shown in FIG. Thereafter, when cooled, a dent is formed as shown in FIG. Here, since the back plate is firmly bonded to the support plate, the dent appears on the front plate. This dent impairs the external shape, and has a problem that a writing panel gives a feeling of unevenness when writing.
[0004]
[Problems to be solved by the invention]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel having a display function that allows display / erasure to be formed by applying an external force to inclusions and that can be used repeatedly and repeatedly. An object of the present invention is to propose a display panel capable of preventing deformation of a face plate, and to propose a solution to such a problem.
[0005]
[Means for Solving the Problems]
The present invention provides a display panel that minimizes deformation of a panel surface plate.
That is, the present invention
"1. A display panel in which a support plate is disposed on the opposite side of the display surface of a display panel having a sealed multi-cell structure including a front plate, a back plate, and a partition wall having a display function capable of repeatedly using display / erasing, A display panel, wherein a weak adhesive having an adhesive force of 50 to 300 N / m is used for a method of joining a back plate and a support plate.
2. 2. The display panel according to claim 1, wherein the weak adhesive is an acrylic adhesive.
3. In a display panel having a support plate disposed on the opposite side of a display surface of a display panel having a sealed multi-cell structure including a front plate, a back plate, and a partition wall having a display function capable of repeatedly using display / erasing, A display panel, wherein an adhesive medium having an adhesive force of 50 to 600 N / m, in which a support medium is sandwiched between adhesives, is used for a method of bonding with a support plate.
4. 4. The display panel according to claim 1, wherein the thickness of the back plate of the display panel is smaller than the thickness of the front plate.
5. Magnetic material reversal in which fine particle-shaped magnetic display materials with different magnetic pole colors are dispersed in a dispersion medium having a yield value that is mainly composed of a dispersion medium and a thickener that can display two colors using a magnet. 5. The display panel according to any one of items 1 to 4, which has a display function. About.
[0006]
According to the display panel described above, it is possible to obtain an excellent effect that the surface plate is not deformed due to a change in the surrounding environment unlike the related art, and the uneven feeling during writing can be suppressed without damaging the external shape. it can.
[0007]
As the display function of the display panel of the present invention, a display function that forms a display / erase by applying an external force to the inclusion and is used repeatedly and repeatedly is used. Specifically, the display body in the cell, for example, a solvent in which magnetic particles are dispersed, filled with a medium such as water and air, sealed, and subjected to external force such as magnetism or electricity to invert, migrate, orient and display. And the like.
[0008]
Conventionally known materials can be used for the front plate, the back plate, the partition, and the like that constitute the closed multi-cell structure, but in view of the display function, in terms of light transmission, it is better to avoid a material that is too thick. Good.
[0009]
As the support material, an iron plate or a wooden plate, a resin material having a moderately rigid feeling, or the like can be used. When used as a magnetic reversal display panel, a magnetic flux concentrating member such as an iron plate is used for the purpose of reinforcing the panel from the advantage of concentrating magnetic flux and improving display / erasing performance. Since the iron plate has a large coefficient of thermal expansion, by using a weak adhesive for the joining, the influence on the surface plate of the display panel or the like can be reduced.
[0010]
In the present invention, a support plate is provided on the opposite side of the display surface of a display panel having a closed multi-cell structure including a front plate, a back plate, and a partition, and a weak adhesive is used in a method of joining the display panel and the support plate. Conventionally, as described above, since the back plate and the support plate are firmly adhered to each other with an adhesive such as SBR as described above, deformation of the surface plate occurs due to expansion and contraction of the inclusion due to a change in the surrounding environmental temperature. Had the problem of doing so. Since the multi-cell structure is closed and the inclusions are enclosed, when the surroundings become hot, the inclusions expand, deforming the flexible surface plate, etc., and the cells expand as shown in FIG. I do. Thereafter, it is cooled, and a dent occurs as shown in FIG. As described above, the depression impairs the external shape, and the writing panel has a problem of giving a feeling of unevenness during writing.
[0011]
As a result of the study of the present inventors, it was found that the reason why the dents appeared on the front plate was largely due to the fact that the back plate was firmly bonded to the support plate.
The adhesive is a fluid liquid before being cured at the time of application, and has wettability to the adherend, but is subsequently cured by heating or a chemical reaction and adheres firmly at the interface.
On the other hand, the pressure-sensitive adhesive is a soft gel at room temperature, and has a property that it is not easily wetted to the adherend and changes over time and state. Among the pressure-sensitive adhesives, a weak pressure-sensitive adhesive having a lower pressure-sensitive adhesive strength is used in the present invention.
[0012]
By using a weak adhesive in the method of joining the back plate and the support plate, the space between the back plate and the support plate becomes flexible, and as shown in FIG. In this case, the back plate can be deformed. Therefore, no load is applied only to the surface plate, and the deformation of the surface plate can be reduced. The weak adhesive preferably has an adhesive strength of 50 to 300 N / m, more preferably 70 to 160 N / m. Below this range, the laminating ability becomes inferior, and above this range, the deformation of the back plate is hindered and the effect of reducing the deformation of the front plate tends to be impaired, which is not preferable. Further, the adverse effect when a material having a high coefficient of thermal expansion such as an iron plate is used for the support plate is also improved by setting the content in this range. In the present invention, the adhesive strength refers to a value measured according to JIS Z0237-2000 (180 degree peeling method).
[0013]
When the weak adhesive is physically classified, a solvent-soluble adhesive, a water-soluble adhesive, an emulsion-type adhesive, a latex-dispersed adhesive, a solventless adhesive, and the like can be mentioned. Acrylic resin, acrylic adhesive such as acrylic emulsion, natural rubber, natural rubber latex, styrene butadiene rubber, isobutylene rubber, rubber adhesive such as isoprene rubber, polyvinyl alcohol, polyacrylamide, polyvinyl methyl ether, silicone, etc. Resin-based adhesives are exemplified. Among them, acrylic pressure-sensitive adhesives are preferred from the viewpoint of easily controlling the weak pressure-sensitive adhesive performance.
[0014]
Further, as a method of joining the back plate and the support plate in the present invention, an adhesive medium having a structure in which a support medium such as a nonwoven fabric or urethane foam is sandwiched by an adhesive can be used. As the adhesive force at this time, an adhesive medium of 50 to 600 N / m can be used. It is presumed that the reason why a material having a slightly higher adhesive strength can be used is that a supporting medium such as a nonwoven fabric or urethane foam acts as a cushioning material to enable deformation of the back plate.
[0015]
However, when the above-mentioned adhesive medium is used, the thickness of the adhesive means is increased, and when applied to only a part of the panel, a step may be formed in that part, or the multi-cell structure part may have transparency. In many cases, it is necessary to wipe out a defect such as the adhesive medium being seen through by a separate means. However, the above problem can be easily eliminated by constructing the entire surface, but it is considered that the cost is high and the process is complicated.
[0016]
As described above, in the present invention, by using a weak adhesive or the above-mentioned adhesive medium in the method of joining the back plate and the support plate, the deformation of the front plate at the time of expansion / contraction of the cell caused by a change in the surrounding environment. However, the cells expand in the same way on the front plate side and the back plate side. Therefore, it can be said that even if a weak adhesive or the above-mentioned adhesive medium is used, there is still a large amount of deformation on the surface plate side due to the adhesion. Therefore, if the back plate is made more flexible with respect to the front plate and is configured such that the back plate is deformed when the cells expand / contract, the deformation of the front plate can be reduced to a high degree. Specifically, the back plate is made thinner than the front plate.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
【Example】
Embodiments of the present invention will be described with reference to examples, but the present invention is not limited to the embodiments.
[0018]
Example 1
A multi-cell honeycomb cell made of vinyl chloride resin with a cell size of 3.5 mm, a regular hexagonal shape and a height of 1.0 mm, which is adhered to one surface of a vinyl chloride resin film having a thickness of 0.125 mm using an epoxy adhesive as a surface plate. The cell of the structure is filled with the encapsulation liquid, and then the open surface of the multi-cell structure is coated with the above adhesive using a 0.05 mm-thick vinyl chloride resin film as a back plate, and weakly adhered to the back plate. An acrylic rubber was applied using isohexane as a solvent as an agent, and an iron plate having a thickness of 0.2 mm was attached as a support plate to obtain a display panel. At this time, the adhesive force of the weak adhesive was 80 N / m.
As the encapsulating liquid, isoparaffin is used as a dispersion medium, ethylene bis-12-hydroxystearic acid amide is used as a thickening agent, and a foil-shaped magnetic display member and a static-preventive agent are separately coated in two colors, green and white. Then, a dispersion liquid in which the magnetic display material was uniformly dispersed in the dispersion liquid was used.
[0019]
This display panel is a magnetic material reversal display panel having a display function that allows display / erasure to be repeatedly and repeatedly used by reversing particles by the action of a magnet. The method of use is to first contact the S pole of the magnet on one side, and to align the magnetic display material in the honeycomb cell, which is painted in two colors, on the surface side so that the particles are partially overlapped and aligned. Then, a writing operation is performed on the display surface with the N pole of the magnet from above the surface plate, and a clear white color is formed only at the portion where the N pole of the magnet passes on the green display surface. To get the right display. Next, using the S pole of the magnet again, the white display portion is operated so as to be rubbed from above, the magnetic display body having the white surface facing the surface is reversed, the green display surface is returned again, and repeated use is possible. It is possible.
[0020]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. Observation confirmed that no irregularities were formed.
[0021]
Example 2
A display panel was obtained in the same manner as in Example 1, except that an acrylic emulsion was used as the weak adhesive. At this time, the adhesive force of the weak adhesive was 157 N / m.
[0022]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. Observation confirmed that no irregularities were formed.
[0023]
Example 3
A display panel was obtained in the same manner as in Example 2 except that the adhesive strength of the weak adhesive was set to 76 N / m.
[0024]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. Observation confirmed that no irregularities were formed.
[0025]
Example 4
A display panel was obtained in the same manner as in Example 1 except that an acrylic resin was applied using toluene as a solvent as a weak adhesive. At this time, the adhesive force of the weak adhesive was 196 N / m.
[0026]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. Upon observation, it was confirmed that the level was not a major problem, although slight unevenness was formed.
[0027]
Example 5
A display panel was obtained in the same manner as in Example 1, except that an adhesive medium having an adhesive strength of 540 N / m and an adhesive resin of 0.16 mm applied to both surfaces of the nonwoven fabric was used in the method of joining the back plate and the support plate.
[0028]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. Upon observation, it was confirmed that the level was not a serious problem, although slight unevenness was formed. In addition, since the adhesive medium was provided on a part of the panel, it was transparent from the front side.
[0029]
Comparative Example 1
A display panel was obtained in the same manner as in Example 1 except that styrene butadiene rubber was applied using isohexane as a solvent as a bonding agent for the back plate and the support plate. At this time, an adhesive having an adhesive force of 1800 N / m was used.
[0030]
The environmental temperature of the above display panel is changed in a room temperature environment (20 ° C.) → 60 ° C./8 hours → 20 ° C./16 hours → −10 ° C./8 hours → room temperature environment (20 ° C.) to change the state of the surface plate. As a result of observation, large irregularities were formed, the appearance was impaired, and the irregularities were felt when writing with a magnetic pen, which was problematic.
[0031]
【The invention's effect】
As described above, the display panel of the present invention has an excellent effect of preventing deformation of the surface plate from expansion and contraction of the inclusion due to a difference in ambient temperature.
[Brief description of the drawings]
FIG. 1 shows an example of a conventional display panel in which an inclusion expands and a surface plate is deformed into a convex shape. FIG. 2 shows an example of a conventional display panel in which an inclusion is contracted and a surface plate is deformed into a concave shape. An example of the display panel of the present invention in which an object shrinks and the back plate is deformed into a concave shape. FIG. 4 is a perspective view showing an example of a display panel.
DESCRIPTION OF SYMBOLS 1 Front plate 2 Back plate 3 Partition wall 4 Support plate 5 Inclusion (closed cell)

Claims (5)

A display panel having a support plate disposed on the opposite side of a display surface of a display panel having a sealed multi-cell structure including a front plate, a back plate, and a partition wall having a display function capable of repeatedly using / removing display / erasing, A display panel, wherein a weak adhesive having an adhesive strength of 50 to 300 N / m is used for a method of bonding to a support plate. The display panel according to claim 1, wherein the weak adhesive is an acrylic adhesive. A display panel having a support plate disposed on the opposite side of a display surface of a display panel having a sealed multi-cell structure including a front plate, a back plate, and a partition wall having a display function capable of repeatedly using / removing display / erasing, A display panel, wherein an adhesive medium having an adhesive force of 50 to 600 N / m, in which a support medium is sandwiched by an adhesive, is used for a method of bonding with a support plate. 4. The display panel according to claim 1, wherein the thickness of the back panel of the display panel is smaller than the thickness of the front panel. Magnetic material reversal in which fine particle-shaped magnetic display materials with different magnetic pole colors are dispersed in a dispersion medium having a yield value mainly composed of a dispersion medium and a thickener which can display two colors by a magnet with a magnet. The display panel according to any one of claims 1 to 4, which has a display function.

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