JP2008015427A - Image display medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display medium which suppresses moisture from entering thereinto from the outside. <P>SOLUTION: The image display medium comprises: a display layer which displays an image; first and second support substrates which are arranged facing each other with the display layer between: a first electrode which has light-transmitting property and is disposed on a surface on the display side of the first support substrate; a first moisture-proof layer which is disposed on the surface on the display layer side of the first support substrate and has light-transmitting property and moisture-proof property; a second electrode which is disposed on the surface on the display layer side of the second support substrate; and a second moisture-proof layer which is disposed on the surface on the side opposite to the display layer side of the second support substrate and has the moisture-proof property. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display medium.

As a conventional image display device, an image display device that reliably blocks the terminal electrode from moisture and impurities in the outside air by arranging a moisture-proof plate on the terminal electrode drawn out from the panel via a moisture-proof coating layer has been reported. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 10-170942

  An object of the present invention is to provide an image display medium that suppresses the entry of moisture from the outside.

  In order to achieve the above object, one embodiment of the present invention provides the following image display medium.

  [1] A display layer for displaying an image, first and second support substrates arranged to face each other with the display layer interposed therebetween, and a transparent layer provided on the display layer side surface of the first support substrate. A light-transmitting first electrode, a light-transmitting and moisture-proof first moisture-proof layer provided on the surface of the first support substrate on the display layer side, and the second support substrate. A second electrode provided on a surface on the display layer side, and a second moisture-proof layer having moisture resistance provided on a surface of the second support substrate on the opposite side of the display layer. An image display medium characterized by that.

  [2] The image display medium according to [1], wherein the second moisture-proof layer includes aluminum.

  [3] The image display medium according to [1], wherein the second electrode and the second moisture-proof layer include aluminum.

  [4] The image display medium according to [1], wherein the second moisture-proof layer has a thickness of 15 μm or more.

  [5] For a second support substrate provided on the surface of the second support substrate on the display layer side and provided outside the second electrode with a gap of a predetermined distance from the second electrode. An outer frame portion, and a gap between the second electrode and the second support substrate outer frame portion, provided in a portion sandwiched between the display layer and the second support substrate; The image display medium according to [1], further comprising: a second support substrate adhesive layer that adheres the two support substrates.

  [6] The image display medium according to [5], wherein the second support substrate adhesive layer has moisture resistance.

  [7] The image according to [6], wherein the second support substrate adhesive layer includes at least one of a urethane resin, an epoxy resin, and a polyester resin. Display medium.

  [8] The image display medium according to [5], wherein the second electrode and the second support substrate outer frame portion include aluminum.

  [9] For the first support substrate provided on the surface of the first support substrate on the display layer side and provided outside the first electrode with a gap of a predetermined distance from the first electrode. An outer frame portion, and a gap between the first electrode and the first support substrate outer frame portion, provided in a portion sandwiched between the display layer and the first support substrate; The image display medium according to [1], further comprising: a first support substrate adhesive layer that adheres one support substrate.

According to the image display medium of the first aspect, it is possible to prevent moisture from entering from the outside.
According to the image display medium of the second aspect, the moisture resistance can be further improved.
According to the image display medium of the third aspect, the manufacturing can be facilitated by sharing the material.
According to the image display medium of the fourth aspect, it is possible to suppress the generation of pinholes in the second moisture-proof layer and to ensure conductivity and moisture-proof property.
According to the image display medium of the fifth aspect, it is possible to suppress the occurrence of unevenness on the surface of the image display medium due to the adhesive layer while maintaining moisture resistance.
According to the image display medium of the sixth and seventh aspects, the moisture resistance can be further improved.
According to the image display medium of the eighth aspect, manufacturing can be facilitated by sharing the material.
According to the image display medium of the ninth aspect, the moisture resistance can be further improved.

[First Embodiment]
(Configuration of image display medium)
FIG. 1 is a perspective view of an image display medium according to the first embodiment of the present invention. The image display medium 1 is formed on a display layer 2 made of liquid crystal or the like, a front substrate 3 and a rear substrate 4 that are opposed to each other with the display layer 2 interposed therebetween, and a front substrate 3 and a rear substrate 4, respectively. It has a front extraction electrode 33 and a rear extraction electrode 43 for electrical connection with the outside, and is schematically configured. A thermoplastic film (not shown) may be formed so as to cover the entire image display medium 1.

  In the present embodiment, the image display medium 1 will be described as being optical writing type electronic paper. In the case of optical writing type electronic paper, although not shown, the display layer 2 is a liquid crystal layer whose reflectance (transmittance) changes according to an applied voltage, a light absorption layer that absorbs light, and resists by light irradiation. It has a configuration in which photoconductive layers with decreasing values are stacked in order from the display surface side, or a configuration in which a light absorption layer, a photoconductive layer, an isolation layer, and a liquid crystal layer are stacked in order from the display surface side. The liquid crystal layer includes, for example, a microcapsule in which cholesteric liquid crystal is sealed. The photoconductive layer includes a charge transport layer and a pair of charge generation layers stacked on both sides of the charge transport layer. Thus, an alternating voltage can be applied to the liquid crystal layer, so that deterioration of the liquid crystal layer can be suppressed, and the driving voltage can be lowered and the lifetime of the electronic paper can be increased.

  The front extraction electrode 33 and the rear extraction electrode 43 are made of a metal such as Ni having a thickness of 140 μm, for example.

  2A and 2B are a top view and a bottom view of the surface substrate, respectively. 2A is a view of the surface substrate 3 and the surface extraction electrode 33 connected to the surface substrate 3, as viewed from the inside (display layer 2 side), and FIG. 2B is viewed from the opposite side. FIG.

  The surface substrate 3 includes a surface support substrate 31, a water vapor barrier layer 36 formed on the surface support substrate 31, a surface electrode 32 formed on the water vapor barrier layer 36, and the surface electrode 32 on the surface support substrate 31. It has a surface adhesive layer 34 formed on the outside.

  The surface support substrate 31 is made of a transparent resin material such as polyethylene terephthalate (PET) having a thickness of 100 μm, for example.

  The transparent water vapor barrier layer 36 is formed, for example, by vapor-depositing a moisture-proof transparent material such as silicon nitride on the inner side (display layer 2 side) of the surface support substrate 31 and passes through the surface substrate 3 to the inside of the image display medium 1. This prevents moisture from entering.

  The surface electrode 32 is a transparent electrode made of, for example, indium tin oxide (ITO) having a thickness of 50 nm, zinc oxide, or the like. The surface electrode 32 is formed by patterning by etching or the like on the surface support substrate 31 and is provided on the inner side of the outer edge of the surface support substrate 31. Therefore, the surface electrode 32 is provided between the outer edge of the surface electrode 32 and the outer edge of the surface support substrate 31. Are spaced.

  The surface adhesive layer 34 is preferably composed of a moisture-proof material such as a urethane resin, an epoxy resin, and a polyester resin. For example, a material obtained by mixing silica with a bisphenol F type epoxy resin may be used. it can. The surface adhesive layer 34 bonds the display layer 2 and the surface substrate 3 together.

  The surface extraction electrode 33 is electrically connected to the surface electrode 32, and conducts electrical connection between the connector of the external device and the surface electrode 32 when an external device (not shown) such as an image writing device is connected to the image display medium 1. .

  3A and 3B are a top view and a bottom view of the back substrate, respectively. 3A is a view of the back substrate 4 and the connected back extraction electrode 43 as seen from the inside (display layer 2 side), and FIG. 3B is a view of this as seen from the opposite side. is there.

  The back substrate 4 includes a back support substrate 41, a back electrode 42 formed on the back support substrate 41, a back adhesive layer 44 formed on the surface of the back electrode 42, and outside the back electrode 42 (back electrode 42 And a moisture-proof layer 46 formed on the surface of the surface opposite to the surface on which is formed.

  The back support substrate 41 can be formed using the same material as the surface support substrate having a thickness of 100 μm, for example, but may be an opaque material.

  The back electrode 42 is made of, for example, a conductive material having moisture resistance such as aluminum, copper having a thickness of 15 μm, and a compound or mixture containing these. When the aluminum film is made thinner than 15 μm, pinholes are generated, which may impair the function and moisture resistance of the electrode. The back electrode 42 preferably has a larger area than the surface electrode 32 and is formed up to a portion that substantially coincides with the outer edge of the back support substrate 41 in a region overlapping the display layer 2.

  The moisture-proof layer 46 is preferably made of a conductive material having moisture-proof properties such as aluminum and copper having a thickness of 20 μm, and a compound or mixture containing these, and is preferably formed in substantially the same area as the back support substrate 41. If thickness is 15 micrometers or more, in order to suppress generation | occurrence | production of a pinhole and to further improve moisture resistance, it is preferable to set it as about 20 micrometers. By providing the moisture-proof layer 46, it is possible to prevent moisture from entering the image display medium 1 through the back substrate 4.

  The back adhesive layer 44 can be formed using the same material as the surface adhesive layer 34, and adheres the display layer 2 and the back substrate 4.

  The back surface extraction electrode 43 is electrically connected to the back surface electrode 42, and when the external device (not shown) such as an image writing device is connected to the image display medium 1, the back surface electrode 42 is electrically connected to the connector of the external device. .

  FIG. 4 is a top view of the image display medium, and FIG. 5 is a cross-sectional view taken along a dashed line A-A ′ in FIG.

  The front substrate 3 and the rear substrate 4 are disposed to face each other so that the front electrode 32 and the rear substrate 42 are located on the liquid crystal layer 2 side. The front electrode 32 and the rear substrate 42 are positioned with the display layer 2 interposed therebetween. When power is supplied from an external device via the front extraction electrode 33 and the rear extraction electrode 43 when writing an image on the image display medium 1, the display layer Apply voltage to 2.

  Due to the presence of the back adhesive layer 44, irregularities are produced in the corresponding portions of the back substrate 4. In order to eliminate the unevenness of the image display medium 1, for example, a thermoplastic film (not shown) is formed so as to cover the entire image display medium 1 with a thickness that makes the surface of the image display medium 1 flat.

  Since the back electrode 42 having moisture resistance has substantially the same size as the liquid crystal layer 2, the back electrode 42 exists between the display layer 2 and the back support substrate 41 at the edge of the image display medium 1, Moisture is prevented from entering from the interface between the display layer 2 and the back support substrate 41 at the end of the image display medium 1.

[Second Embodiment]
The second embodiment of the present invention is different from the first embodiment in the configuration of the back substrate. Note that the description of the same points as in the first embodiment, such as the material and the configuration of other parts, is omitted.

  FIGS. 6A and 6B are a top view and a bottom view, respectively, of the back substrate according to the second embodiment of the present invention. 6A is a view of the back substrate 4 and the connected back extraction electrode 43 as seen from the inside (display layer 2 side), and FIG. 6B is a view of this as seen from the opposite side. is there.

  The back substrate 4 includes a back support substrate 41, a back electrode 42 and a back outer frame portion 45 formed on the back support substrate 41, and a gap between the back electrode 42 and the back outer frame portion 45 on the back support substrate 41. The back adhesive layer 44 is formed, and a moisture-proof layer 46 formed on the outer surface of the back electrode 42 (the surface opposite to the surface on which the back electrode 42 is formed).

  The back electrode 42 has a smaller area than the back support substrate 41 and is formed inside the outer edge of the back support substrate 41.

  The back outer frame portion 45 has moisture resistance and is formed outside the back electrode 42 on the back support substrate 41 with a width of, for example, 2 to 3 mm with a distance of 2 to 3 mm from the back electrode 42. . The rear outer frame portion 45 is preferably formed up to a portion that substantially coincides with the outer edge of the rear support substrate 41 in the region overlapping the display layer 2. The back electrode 42 and the back outer frame portion 45 can be formed simultaneously by patterning a material such as an aluminum film by etching or the like.

  The back adhesive layer 44 is formed in a gap between the back electrode 42 on the back support substrate 41 and the back outer frame portion 45, and bonds the display layer 2 and the back substrate 4.

  FIG. 7 is a cross-sectional view of the image display medium, and shows a cross-section at a position corresponding to the cross-sectional view shown in FIG.

  The back electrode 42 and the back outer frame portion 45 have substantially the same thickness (for example, 15 μm), and the back adhesive layer 44 has the same or slightly thicker thickness. Since the thickness of the back adhesive layer 44 is almost the same as that of the back electrode 42 and the back outer frame portion 45, the occurrence of unevenness on the back substrate 4 is suppressed.

  Since the back outer frame portion 45 having moisture resistance is provided on the outer edge of the back support substrate 41, the back outer frame portion is also provided between the display layer 2 and the back support substrate 41 at the end of the image display medium 1. 45, and moisture is prevented from entering from the interface between the display layer 2 and the back support substrate 41 at the end of the image display medium 1.

[Third Embodiment]
The third embodiment of the present invention differs from the second embodiment in the configuration of the surface substrate. Note that the description of the same points as in the second embodiment, such as the material and the configuration of other parts, is omitted.

  FIGS. 8A and 8B are a top view and a bottom view, respectively, of the surface substrate according to the third embodiment of the present invention. FIG. 8A is a view of the surface substrate 3 and the connected surface extraction electrode 33 as viewed from the inside (display layer 2 side), and FIG. 8B is a view of this as viewed from the opposite side. is there.

  The surface substrate 3 includes a surface support substrate 31, a water vapor barrier layer 36 formed on the surface support substrate 31, a surface electrode 32 and a surface outer frame portion 35 formed on the water vapor barrier layer 36, and a water vapor barrier layer 36. And a surface adhesive layer 34 formed in a gap between the upper surface electrode 32 and the outer surface frame portion 35.

  The surface electrode 32 has a smaller area than the surface support substrate 31 and is formed inside the outer edge of the surface support substrate 31.

  The outer surface frame portion 35 is moisture-proof and is formed outside the surface electrode 32 on the surface support substrate 31 with a width of, for example, 2 to 3 mm with a distance of, for example, 2 to 3 mm from the surface electrode 32. . The surface outer frame portion 35 is preferably formed up to a portion that substantially coincides with the outer edge of the surface support substrate 31 in a region overlapping the display layer 2. The surface electrode 32 and the surface outer frame portion 35 can be simultaneously formed by patterning a single material such as indium tin oxide (ITO) or zinc oxide by etching or the like.

  The surface adhesive layer 34 is formed in a gap between the surface electrode 32 and the surface outer frame portion 35 on the surface support substrate 31 and adheres the display layer 2 and the surface substrate 3.

  9 is a cross-sectional view of the image display medium, and shows a cross-section at a position corresponding to the cross-sectional view shown in FIG.

  Since the back outer frame portion 45 having moisture resistance is provided on the outer edge of the back support substrate 41, the water vapor barrier layer 36 is also provided between the display layer 2 and the back support substrate 41 at the end of the image display medium 1. In addition, there is a rear outer frame portion 45, which more strongly suppresses moisture from entering between the display layer 2 and the rear support substrate 41 at the end of the image display medium 1.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the spirit of the invention.

1 is a perspective view of an image display medium according to a first embodiment of the present invention. (A), (b) is the top view and bottom view of the surface substrate which respectively concern on the 1st Embodiment of this invention. (A), (b) is the top view and bottom view of a back substrate which concern on the 1st Embodiment of this invention, respectively. 1 is a top view of an image display medium according to a first embodiment of the present invention. 1 is a cross-sectional view of an image display medium according to a first embodiment of the present invention. (A), (b) is the top view and bottom view of the back substrate which concern on the 2nd Embodiment of this invention, respectively. It is sectional drawing of the image display medium which concerns on the 2nd Embodiment of this invention. (A), (b) is the top view and bottom view of a surface substrate which concern on the 3rd Embodiment of this invention, respectively. It is sectional drawing of the image display medium which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

1 image display medium 2 display layer 3 surface substrate 31 surface support substrate 32 surface electrode 33 surface extraction electrode 34 surface adhesive layer 35 surface outer frame portion 36 water vapor barrier layer 4 back substrate 41 back support substrate 42 back electrode 43 back extraction electrode 44 back surface Adhesive layer 45 Back frame 46 Dampproof layer

Claims (9)

A display layer for displaying images;
First and second support substrates disposed opposite to each other with the display layer interposed therebetween;
A translucent first electrode provided on the display layer side surface of the first support substrate;
A first moisture-proof layer having translucency and moisture-proof properties provided on the surface of the first support substrate on the display layer side;
A second electrode provided on the display layer side surface of the second support substrate;
A second moisture-proof layer having a moisture-proof property provided on the surface of the second support substrate opposite to the display layer;
An image display medium comprising:   The image display medium according to claim 1, wherein the second moisture-proof layer includes aluminum.   The image display medium according to claim 1, wherein the second electrode and the second moisture-proof layer include aluminum.   The image display medium according to claim 1, wherein the second moisture-proof layer has a thickness of 15 μm or more. A second support substrate outer frame portion provided on the surface of the second support substrate on the display layer side and spaced apart from the second electrode by a predetermined gap on the outside of the second electrode. When,
The display layer and the second support substrate are provided in a portion between the display layer and the second support substrate in a gap between the second electrode and the second support substrate outer frame portion. A second support substrate adhesive layer to be bonded;
The image display medium according to claim 1, further comprising:   The image display medium according to claim 5, wherein the second support substrate adhesive layer has moisture resistance.   The image display medium according to claim 6, wherein the second support substrate adhesive layer includes at least one of a urethane resin, an epoxy resin, and a polyester resin.   The image display medium according to claim 5, wherein the second electrode and the second support substrate outer frame portion include aluminum. A first support substrate outer frame portion provided on the surface of the first support substrate on the display layer side and spaced apart from the first electrode by a predetermined gap on the outside of the first electrode. When,
The display layer and the first support substrate are provided at a portion between the display layer and the first support substrate in a gap between the first electrode and the first support substrate outer frame portion. A first support substrate adhesive layer to be bonded;
The image display medium according to claim 1, further comprising:

Images