JP2012255844A - Information display panel module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid breaks of connection electrode of a flexible connection substrate disposed along a surface of a back side panel substrate, the breaks being caused by the contact of the flexible connection substrate with a corner part of an edge of the back side panel substrate or friction against the corner part, so as to increase display quality.SOLUTION: An information display panel module is assembled in such a manner that while a connection substrate is disposed along a surface of a back side panel substrate without being folded back, the connection terminal part of a display surface side panel substrate and the terminal part for the connection electrodes of the connection substrate are disposed facing closely to each other with the connection substrate being bent, the two terminal parts being connected to each other with anisotropic conductive material. In a conductive mounting part, at least an electrode part exposed from the anisotropic conductive material of each of the connection terminal part and the terminal part for the connection electrodes is covered with moisture-proof insulation material, and further at least an end area including side end faces of the conductive mounting part of the back side panel substrate and corners of the side end faces is also covered therewith.

Description

  The present invention folds back a flexible connection substrate such as a TCP (Tape Carrier Package) or FPC (Flexible Printed Circuit) used for connection to an external drive circuit along the surface of the back side panel substrate of the information display panel. The connection terminal portion that is provided inside the display surface side panel substrate and is connected to the connection substrate (TCP or FPC) and the connection electrode terminal portion of the connection substrate are arranged to face each other. With respect to the information display panel module having a structure connected to each other by an anisotropic conductive material, in particular, the disconnection of the connection electrode of the connection substrate, which is concerned in the vicinity of the end surface on the connection portion side of the rear panel substrate, is avoided. Therefore, it is intended to improve display quality.

  In order to display information on the information display panel, it is necessary to electrically control the display means. For this purpose, it is necessary to connect the information display panel to an external drive circuit that performs this electrical control. For the connection, a flexible connection substrate such as TCP or FPC is usually used. An assembly of the information display device can be improved by preparing an information display panel module in which a flexible connection substrate is joined to the information display panel.

As such an information display panel module, what is described in patent document 1 and patent document 2, for example is known.
An example of the structure of such an information display panel module will be described with reference to FIGS. 1 and 2 and another example with reference to FIGS.
First, an example of the structure of a conventional information display panel module will be described.
1A shows a display surface side panel substrate, FIG. 1B shows a back side panel substrate, and FIG. 1C shows a flexible connection substrate. FIG. 2A is a plan view of an information display panel module configured using each of the substrates shown in FIGS. 1A to 1C. Moreover, FIG.2 (b) is the AA cross-sectional enlarged view of Fig.2 (a).

  In the conventional example shown in FIGS. 1 and 2, reference numeral 1 denotes an information display panel module, 2 denotes a display surface side panel substrate, 3 denotes a back side panel substrate, 4 denotes a flexible connection substrate, and 5 denotes a display surface side. Display electrodes on the panel substrate (in this example, stripe electrodes are shown), 6 is a connection terminal portion serving as a terminal portion of the display electrode of the display surface side panel substrate, and 7 is a connection electrode of a flexible connection substrate. , 8 are terminal portions of connection electrodes of the flexible connection substrate, and 9 is an anisotropic conductive material. In addition, 10 is a display electrode on the back side panel substrate (in this example, indicates a stripe electrode), 11 is a terminal portion of the display electrode of the back side panel substrate, 12 is TCP, 13 is a partition for securing a gap between substrates, 14 Is a seal material formed in a frame shape around the information display screen area.

  The display surface side panel substrate 2 is configured by a substrate whose information display screen region is transparent, and an information display screen region (region surrounded by a dotted line in the figure) is provided on one side thereof as shown in FIG. ), A transparent stripe electrode (display electrode) 5 is formed, and a connection terminal portion 6 drawn from the display electrode 5 is provided outside the information display screen area.

Further, as shown in FIG. 1B, a stripe electrode (display electrode) 10 is formed on one surface of the back side panel substrate 3 in an information display screen area (area surrounded by a dotted line in the figure). A terminal portion 11 drawn from the display electrode 10 is provided outside the information display screen area.
Further, as shown in FIG. 1 (c), a line electrode (connection electrode) 7 for connection wiring to an external drive circuit is formed on the flexible connection substrate 4, and at one end thereof. A terminal portion 8 of the connection electrode is formed.

  Then, the display surface side panel substrate 2, the back side panel substrate 3 and the flexible connection substrate 4 are stacked without folding the flexible connection substrate 4 as shown in FIG. As shown in FIG. 2 (b), the connection terminal portion 6 of the display surface side panel substrate 2 and the connection electrode 7 of the flexible connection substrate 4 are bent while the flexible connection substrate 4 is bent. These two connection terminal portions (the connection terminal portion 6 of the display surface side panel substrate 2 and the terminal portion 8 of the connection electrode 7 of the flexible connection substrate 4) are arranged in close proximity to each other. Are connected by an anisotropic conductive material 9. A region having a structure in which the connection terminal portion 6 of the display surface side panel substrate 2 and the terminal portion 8 of the connection electrode 7 of the flexible connection substrate 4 are connected by an anisotropic conductive material 9 is described below. This is referred to as “conductive mounting portion”.

  Further, between the display surface side panel substrate 2 and the back side panel substrate 3, a sealing material 14 is provided in a frame shape around the outer peripheral portion of the inter-substrate gap securing partition wall 13, that is, around the information display screen region. A display medium layer in which a display medium driven by electrical control is sealed is provided inside the gap securing partition wall 13 (not shown). Display media driven by electrical control include, for example, those in which particles containing charged particles are driven in a gas (including vacuum) or in an insulating liquid, or liquid crystals such as cholesteric liquid crystals and so on.

Then, display is performed via an electrode pair formed by the display electrode 5 of the display surface side panel substrate 2 and the display electrode 10 of the back side panel substrate 3 which are arranged to face each other as shown in FIG. The medium is electrically controlled and driven to display information.
In an example in which a particle group including a chargeable particle is used as a display medium, an electric field formed by applying a voltage to an electrode pair formed by intersecting, preferably orthogonally intersecting, stripe electrodes facing each other with this electrode pair, Information is displayed by moving the chargeable particles constituting the display medium.

Next, another example of the structure of a conventional information display panel module will be described.
3 (a) and 3 (b) are views before mounting the first and second flexible connection substrates 4-1 and 4-2, respectively, when viewed from the front side of the display surface side panel substrate. It is a schematic diagram which shows after mounting. FIG. 4A is a diagram showing a part of the information display panel when viewed from the back side of the display surface side panel substrate. FIG. 4B is an AA cross-sectional enlarged view crossing the first flexible connection substrate 4-1 in FIG. FIG. 4C is an enlarged cross-sectional view taken along the line B-B crossing the second flexible connection substrate 4-2 in FIG.

  In the conventional example shown in FIGS. 3 and 4, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and 30 is for connection provided on the inside of the display surface side panel substrate. An electrode 31 is an anisotropic conductive seal (ACS) that connects the connection electrode 30 and a display electrode provided on the inner side of the rear panel substrate, that is, an anisotropic conductive sealant that is a sealant containing conductive particles. , 32 are drive circuit boards, and 33-1 and 33-2 are connectors provided on the drive circuit board 32.

  As shown in FIG. 4B, one end of the first flexible connection substrate 4-1 is provided on the display surface side panel substrate 2, and the display electrode 10 on the back side panel substrate side. And the connection terminal portion of the connection electrode 30 connected via the ACS 31 via the anisotropic conductive material 9. The other end of the first flexible connection board 4-1 is connected to a connector 33-1 provided on the drive circuit board 32 disposed on the back side of the rear panel board 3.

  Further, as shown in FIG. 4C, one end of the second flexible connection substrate 4-2 is different from the connection terminal portion 6 of the display electrode of the display surface side panel substrate 2. They are connected via the isotropic conductive material 9. The other end of the second flexible connection board 4-2 is connected to a connector 33-2 provided on the drive circuit board 32.

  In this way, by mounting the flexible connection board so that the connection end with the drive circuit side faces inward, the information display panel can be driven without folding the flexible connection board. It is connected to the drive circuit side of the device.

JP 2010-145722 A International Publication No. 2010/073716 Pamphlet

  In the information display panel module having the above-described configuration, the flexibility is arranged so as to cover the edge of the back side panel substrate 3 at the time of assembling to the information display device or at the time of use after forming the information display device. In some cases, a force that causes a relative displacement between the connecting substrate 4 and the back-side panel substrate 3 acts repeatedly. In such a case, in the conventional information display panel module having the above-described configuration, the flexible connection substrate 4 is rubbed against the corner portion of the conductive mounting portion side end surface 3a of the back side panel substrate 3, and the back side By repeatedly receiving local deformation at the corners of the conductive mounting portion side end surface 3a of the panel substrate 3, the connection electrode 7 may be disconnected even if the connection electrode 7 is covered with an insulating film. As a result, display defects may be forced. In FIG. 2B, FIG. 3B, and FIG. 3C, the insulating film covering the connection electrode 7 of the flexible connection substrate 4 is not shown.

  By the way, conventionally, a moisture-proof insulating material is disposed on the conductive mounting portion of the information display panel module. Also in the information display panel module having the above configuration, for example, as shown in FIGS. 5A, 5 </ b> B, and 5 </ b> C, a moisture-proof insulating material is disposed in the conductive mounting portion. FIG. 5A is a plan view, and FIGS. 5B and 5C are an enlarged cross-sectional view and a side enlarged view, respectively, taken along line BB in FIG. 5A. In the figure, reference numeral 15 denotes an information display panel module, and 16 is a moisture-proof insulating material. In FIG. 5A, the display electrode 5 of the display surface side panel substrate 2 and the display electrode 10 of the back side panel substrate 3 are not shown, and the display surface side panel substrate 2 and the moisture-proof insulating material are omitted. Only 16 is shown. 5B and 5C, the insulating film that covers the connection electrode 7 of the flexible connection substrate 4 is not shown.

  As shown here, in the information display panel module 15 in which the moisture-proof insulating material 16 is formed in the conventional manner on the information display panel module 1 having the above configuration, the display surface side panel substrate 2 and the flexible connection substrate 4 are provided. The electrode portion of the connection terminal portion 6 of the display surface side panel substrate and the terminal of the connection electrode of the flexible connection substrate 4 exposed to the outside of the anisotropic conductive material 9 on the front end surface on the conductive mounting portion side By covering the electrode portion of the portion 8 with the moisture-proof insulating material 16, corrosion of the electrode due to moisture contained in the outside air was prevented.

Therefore, the inventors have adopted a structure in which the moisture-proof insulating material 16 is further formed on the gap S side between the conductive mounting portion and the sealing material 14 formed in a frame shape. Thus, the relative displacement between the flexible connection substrate 4 and the back side panel substrate 3 described above is suppressed, and the flexible connection substrate 4 is formed on the conductive mounting portion side end surface 3a of the back side panel substrate 3. The connection electrode 7 of the flexible connection substrate 4 is disconnected by being rubbed by the corner and by repeatedly receiving local deformation by the corner of the conductive mounting portion side end surface 3a of the back side panel substrate 3. I thought that the problem could be avoided.
However, in this structure, that is, the structure in which the moisture-proof insulating material 16 is formed on both sides of the anisotropic conductive material 9, a slight improvement effect is recognized, but the flexible connection substrate 4 and the back side The displacement with respect to the panel substrate 3 cannot be sufficiently suppressed, and the connection electrode 7 of the flexible connection substrate 4 is moved back by the movement of the flexible connection substrate 4 due to the displacement. Since the conductive mounting portion side end surface 3a of the substrate 3 is rubbed many times, it is difficult to reliably avoid the disconnection of the connection electrode 7.

  The present invention has been developed in view of the above situation, and an information display having a structure in which a flexible connection substrate arranged along the surface of a rear panel substrate is mounted on the display surface side panel substrate without being folded back. In the panel module, an object is to propose an information display panel module which avoids disconnection of the connection electrode of the flexible connection substrate in the vicinity of the end surface on the conductive mounting portion side of the rear panel substrate, thereby improving display quality. And

That is, the gist configuration of the present invention is as follows.
1. A display surface side panel substrate and a back side panel substrate disposed opposite to each other;
Display means for displaying information by electrical control between the opposing panel substrates via display electrodes;
A flexible connection substrate for connecting the display electrode to an external drive circuit;
A connection terminal portion installed on the inner surface of the display surface side panel substrate and connected to a terminal portion of a connection electrode disposed on the flexible connection substrate;
With
The flexible connection substrate is arranged without being folded along the surface of the back side panel substrate, and the connection terminal of the display surface side panel substrate is bent while the flexible connection substrate is bent. An information display panel module having a structure in which a portion and a terminal portion of a connection electrode of the flexible connection substrate are arranged close to each other and these two terminal portions are connected by an anisotropic conductive material,
In the conductive mounting portion having a structure in which the connection terminal portion of the display surface side panel substrate and the terminal portion of the connection electrode of the flexible connection substrate are connected by an anisotropic conductive material, at least the connection terminal And the electrode portions exposed from the anisotropic conductive material of each of the terminal portions of the connection electrode and the connection electrode are covered with a moisture-proof insulating material, and at least the conductive mounting portion side end surface of the back side panel substrate and the corner portion of the end surface An information display panel module, characterized in that the moisture-proof insulating material is formed so as to cover an end region including it.

2. In the vicinity of the conductive mounting portion, the moisture-proof insulating material is applied to the display surface side panel substrate from the conductive mounting portion surface to the end surface, the flexible connection substrate from the conductive mounting portion surface to the end surface, and these. Each of the two substrates is formed so as to extend to the end surfaces of the side edges on both sides, and the end regions of the conductive mounting portion and the display surface side panel substrate and the end regions of the flexible connection substrate are formed as described above. 2. The information display panel module according to 1 above, which is encased in a moisture-proof insulating material.

3. 3. The information display panel according to 1 or 2 above, wherein a buffer material layer is formed on the outer surface of the back side panel substrate so as to extend to a corner of the conductive mounting portion side end surface of the back side panel substrate. module.

  According to the present invention, at least the electrode portion exposed from the anisotropic conductive material of each of the connection terminal portion and the terminal portion of the connection electrode is covered with the moisture-proof insulating material, and at least the conductive mounting portion side end surface of the back side panel substrate Since the moisture-proof insulating material is formed so as to cover the end region including the corner portion of the end surface, the moisture-proof insulating material not only effectively prevents the corrosion of the electrode, but also at least the conductivity of the back side panel substrate. The moisture-proof insulating material formed so as to cover the end surface including the mounting portion side end surface and the corner portion suppresses the displacement of the flexible connection board, and the conductive mounting portion side of the rear side panel substrate. It is possible to prevent local deformation of the connection electrode caused by the corner portion of the end face coming into contact with the flexible connection substrate. Since the displacement of the flexible connection substrate is suppressed, it is possible to prevent the flexible connection substrate from being rubbed repeatedly against the corner of the conductive mounting portion side end surface of the back side panel substrate. In addition, since local deformation of the connection electrode can be prevented, disconnection of the connection electrode of the flexible connection substrate can be avoided. As a result, the display quality of the information display panel can be improved.

  Further, according to the present invention, in a region near the conductive mounting portion, the moisture-proof insulating material is applied to the end surface from the conductive mounting portion surface of the display surface side panel substrate and from the conductive mounting portion surface to the end surface of the flexible connection board. Each of the substrates is formed to extend to the end surfaces of the side edges on both sides, and the end region of the conductive mounting portion and the display surface side panel substrate and the end region of the flexible connection substrate are made of moisture-proof insulating material. By wrapping, the relative displacement between the flexible connection substrate and the back panel substrate can be more effectively prevented by the moisture-proof insulating material. The disconnection of the working electrode can be advantageously avoided. As a result, the display quality of the information display panel can be improved.

  Further, according to the present invention, on the outer surface of the rear panel substrate, the buffer material layer extending to the corner of the conductive mounting portion side end surface of the rear panel substrate is formed, so that at least the conductive mounting portion of the rear panel substrate is formed. In addition to the effect when the moisture-proof insulating material is formed so as to cover the end region including the side end surfaces and the corners, the displacement of the flexible connecting substrate is more affected by the frictional force with the buffer material layer. The effect to be suppressed and the effect that the buffer material layer disposed between the corner portion of the conductive mounting portion side end surface of the back side panel substrate and the flexible connection substrate further suppresses local deformation of the connection electrode are obtained. It is done. Therefore, disconnection of the connection electrode of the flexible connection substrate can be avoided, and as a result, the display quality of the information display panel can be improved.

It is a figure for demonstrating an example of the conventional information display panel module, (a) is a display surface side panel board | substrate, (b) is a back side panel board | substrate, (c) shows a flexible connection board | substrate, respectively. . (A) is a top view which shows an example of the conventional information display panel module comprised using each board | substrate each shown to Fig.1 (a)-(c). (B) is the AA cross-sectional enlarged view of (a). It is a figure for demonstrating the other example of the conventional information display panel module, (a) And (b) is respectively 1st and 2nd flexible when it sees from the back side of a display surface side panel board | substrate. It is a schematic diagram which shows before and after mounting of a conductive connection board. It is a figure for demonstrating the other example of the conventional information display panel module, (a) is a figure which shows a part of information display panel when it sees from the back side of a display surface side panel board | substrate. (B) is the AA cross-section enlarged view of (a). (C) is the BB cross-sectional enlarged view of (a). (A) is a top view which shows another example of the conventional information display panel module. (B), (c) is the BB cross-section enlarged view and side surface enlarged view of (a), respectively. (A), (b) is a figure for demonstrating the display principle in an example of the information display panel used for this invention, respectively. (A) is a top view which shows 1st Embodiment of the information display panel module which concerns on this invention. (B), (c) is the B1-B1 cross-sectional enlarged view and side enlarged view of (a), respectively. (A) is a top view which shows the modification of 1st Embodiment of the information display panel module which concerns on this invention. (B), (c) is the B2-B2 cross-sectional enlarged view and side enlarged view of (a), respectively. (A) is a top view which shows the other modification of 1st Embodiment of the information display panel module which concerns on this invention. (B), (c) is the B3-B3 cross-sectional enlarged view and side enlarged view of (a), respectively. (A) is 2nd Embodiment of the information display panel module based on this invention, (b) is the modification, (c) is a figure which shows another modification, respectively.

Hereinafter, the present invention will be specifically described.
(Basic configuration of information display panel used in the present invention)
First, the basic configuration of the information display panel used in the present invention will be described with reference to FIG. In addition, about the structure same as the structure shown to FIGS. 1-5, the same code | symbol is attached | subjected and shown.
The display means of the information display panel used in the present invention is not particularly limited as long as it is a display means provided with a display medium that displays information by being electrically controlled between opposing panel substrates. The system can be used. Hereinafter, an electrically controlled electric field is formed between display electrodes installed on each of these panel substrates, using a group of particles having optical reflectivity and chargeability disposed between opposing panel substrates as a display medium. A case where a method of displaying information by moving the display medium with this electric field will be described.

  The information display panel of the example shown in FIGS. 6A and 6B used in the present invention is a particle group including particles having at least optical reflectivity and chargeability, and the optical reflectivity and charging characteristics of each other. Of at least two different display media (here, a white display medium 17W configured as a particle group including negatively charged white particles 17Wa and a black display medium 17B configured as a particle group including positively charged black particles 17Ba) ) Are disposed in each cell formed by the partition walls 18 between the panel substrates, and display electrodes 5 (striped electrodes) provided on the panel substrate 2 and display electrodes 10 (striped electrodes) provided on the panel substrate 3 Is moved between the panel substrate 2 and the panel substrate 3 in accordance with an electric field generated by applying a voltage between pixel electrode pairs formed by opposing intersections (preferably opposing orthogonal intersections). . Then, the white display medium 17W is visually recognized by the observer as shown in FIG. 6A, or the black display medium 17B is visually recognized by the observer as shown in FIG. 6B. Are displayed in a matrix with black and white dots. In addition, in FIG. 6 (a), (b), the partition in front is abbreviate | omitted. The panel substrate 2 on the observation side of the panel substrates 2 and 3 and the display electrodes provided on the panel substrate 2 are both made of a transparent material at least in the information display screen area.

The information display panel shown in FIGS. 6A and 6B used in the present invention has a passive drive method, but the display electrode provided on the rear panel substrate is configured as a pixel electrode with a TFT. Needless to say, an active driving method may be used in which the display electrode provided on the observation-side panel substrate is a common electrode made of a solid conductive film.
In addition, a configuration in which a particle group including a charging particle is sealed in the cell together with an insulating liquid, or a capsule type display medium in which a particle group including a charging particle is sealed in a capsule together with an insulating liquid is used as a counter electrode pair. An information display panel having a configuration arranged between them may be used.

(First embodiment of information display panel module according to the present invention)
Next, a first embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 5, the same components are indicated by the same reference numerals. 7A is a plan view showing the first embodiment of the information display panel module according to the present invention, and FIGS. 7B and 7C are cross-sectional views taken along the line B1-B1 in FIG. It is an enlarged view and a side enlarged view.
In FIG. 7, reference numeral 20 denotes an information display panel module, and 21 denotes a moisture-proof insulating material. Reference numerals 21a, 21b, 21c, and 21d are portions that cover the outer portion, the inner portion, the side edge portion, and the end face of the back panel substrate and the corners of the moisture-proof insulating material, respectively.

As shown in FIG. 7, the information display panel module 20 according to this example exposes each of the connection terminal portion 6 of the display surface side panel substrate and the terminal portion 8 of the connection electrode 7 of the flexible connection substrate. The electrode portion is covered with a moisture-proof insulating material 21, and the moisture-proof insulating material 21 is formed so as to cover the conductive mounting portion side end surface 3a and the end region including the corner portion of the back side panel substrate 3. is there.
The moisture-proof insulating material 21 is preferably formed so as to fill the gap S shown in FIGS. 5A and 5B, as in the example shown in FIGS. 7A and 7B. In that case, the structure shown in FIGS. 7A and 7B is obtained by disposing the moisture-proof insulating material 21 so as to extend over the surface of the back-side panel substrate 3.
Here, the thickness of the portion 21 d where the moisture-proof insulating material formed so as to cover the end region including the conductive mounting portion side end surface 3 a and the corner portion of the back side panel substrate 3 covers the corner portion of the back side panel substrate 3. Is 1.0 μm or more. If it is too thick, the flexible connecting board must be greatly bent to form a conductive mounting portion, and the connecting electrode 7 of the flexible connecting board is excessively bent and easily disconnected. A suitable thickness of the portion 21d where the moisture-proof insulating material covers the corners of the back panel substrate 3 is in the range of 1.0 μm to 100 μm.

Specifically, in the conductive mounting portion, the connection terminal portion 6 of the display surface side panel substrate 2 and the connection electrode 7 of the flexible connection substrate 4 exposed on both the inner and outer sides of the anisotropic conductive material 9. The electrode portion of the terminal portion 8 is covered with an outer portion 21a of a moisture-proof insulating material and an inner portion 21b of the moisture-proof insulating material. The inner portion 21b of the moisture-proof insulating material is formed so as to fill a gap S between the conductive mounting portion and the sealing material 14 formed in a frame shape. It is preferable that the inner portion 21b of the moisture-proof insulating material and the outer portion 21a of the moisture-proof insulating material are connected by the side edge portion 21c of the moisture-proof insulating material.
By adopting the above structure, it is possible not only to prevent corrosion of the electrodes, but also to more effectively prevent relative displacement between the connection substrate 4 and the back side panel substrate 3 in the vicinity of the conductive mounting portion. Can do.

  According to the first embodiment of the information display panel module according to the present invention described above, not only can the corrosion of the electrodes be effectively prevented, but also the conductivity of the above-described back side panel substrate 3 of the moisture-proof insulating material 21. The covering portion 21d in the end region including the mounting portion side end surface 3a and the corner portion suppresses the positional displacement of the flexible connection substrate, and the corner portion on the conductive mounting portion side end surface of the back side panel substrate Local deformation of the connection electrode caused by hitting the flexible connection substrate can be prevented. Since the displacement of the flexible connection substrate is suppressed, it is possible to prevent the flexible connection substrate from being rubbed repeatedly against the corner of the conductive mounting portion side end surface of the back side panel substrate. In addition, since local deformation of the connection electrode can be prevented, disconnection of the connection electrode of the flexible connection substrate can be avoided. As a result, the display quality of the information display panel can be improved.

(Modification of the first embodiment of the information display panel module according to the present invention)
Next, a modification of the first embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 7, the same components are denoted by the same reference numerals.
In FIG. 8, 22 shows an information display panel module, and 23 is an insulating moisture-proof material. Note that 23a, 23b, 23c, 23d, 23e, and 23f are an outer portion, an inner portion, a side edge portion, a portion that covers the end surface and the corner portion of the back panel substrate, and a display surface side portion, respectively. The back side part.

  As shown in FIG. 8, the information display panel module 22 according to this example is configured such that the moisture-proof insulating material 23 is mounted on the display surface side panel substrate from the conductive mounting portion surface to the end surface and the flexible connection substrate 4. It is formed so as to extend from the part surface to the end face and to the end faces of the two side faces of each of these two boards, and the conductive mounting part and the end area of the display face side panel board 2 and the flexible connection board 4 It is characterized in that the end region is wrapped with a moisture-proof insulating material 23.

  Specifically, the moisture-proof insulating material 23 covers the surface of the display surface side panel substrate 2 in addition to the outer portion, the inner portion, and the end surface of the back side panel substrate and the portion that covers the corners shown in FIG. The display surface side portion 23e, the back side portion 23f that covers the surface of the flexible connection substrate 4, and the side edge portion that covers both side edges of the two substrates and connects the outer portion 23a and the inner portion 23b. A structure having 23c is preferable.

  With the above structure, not only can the corrosion of the electrode be prevented, but also the relative displacement between the flexible connection substrate 4 and the back panel substrate 3 in the vicinity of the conductive mounting portion is more effective. In addition, since the local deformation of the connection electrode can be prevented, disconnection of the connection electrode 7 can be advantageously avoided.

(Another modification of the first embodiment of the information display panel module according to the present invention)
Next, another modification of the first embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 8, the same components are denoted by the same reference numerals.
In FIG. 9, reference numeral 24 denotes an information display panel module, and 25 denotes a moisture-proof insulating material. Reference numerals 25a, 25b, 25c, 25d, 25e, and 25f denote an outer portion, an inner portion, a side edge portion, a portion that covers the end surface and corner portions of the back panel substrate, and a display surface side portion, respectively. The back side part.

  As shown in FIG. 9, the information display panel module 24 according to this example moves the display surface side portion 25e and the back surface side portion 25f of the moisture-proof insulating material 25 away from the conductive mounting portion as compared with the example shown in FIG. It is characterized by extending in the direction.

  According to the other modification of the first embodiment of the information display panel module according to the present invention described above, the relative displacement between the flexible connection substrate 4 and the back side panel substrate 3 is prevented by moisture-proof insulation. Since the material 25 can be more effectively prevented and local deformation of the connection electrode can be prevented, disconnection of the connection electrode 7 can be avoided more advantageously.

  In the modified example of the first embodiment and other modified examples, the region to be wrapped with the moisture-proof insulating material is about 1 mm to 5 mm from the tip of the display surface side panel substrate 2 on the conductive mounting portion side, for flexible connection It is preferable that the distance is about 5 mm to 20 mm from the front end of the conductive mounting portion side of the substrate 4 and that the display surface side panel substrate 2 does not reach the information display screen area.

(Second Embodiment of Information Display Panel Module According to the Present Invention)
Next, a second embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 7, the same components are denoted by the same reference numerals.
In FIG. 10A, reference numeral 26 denotes an information display panel module, and 27 denotes a buffer material layer.

The information display panel module 26 according to this example is characterized in that a buffer material layer 27 is formed between the back side panel substrate 3 and the flexible connection substrate 4 as shown in FIG. There is.
Here, the thickness of the buffer layer 27 may be 1 μm or more. If the thickness is too thick, the flexible connection substrate 4 must be greatly bent to form a conductive mounting portion, and the connection electrode 7 of the flexible connection substrate 4 is excessively bent and easily disconnected. Therefore, a suitable thickness of the buffer material layer 27 is in the range of 1 μm to 100 μm.

  According to the second embodiment of the information display panel module according to the present invention described above, the buffer material layer 27 causes the corner portion of the conductive mounting portion side end surface 3a of the back side panel substrate 3 to be attached to the flexible connection substrate 4. Can prevent local contact of the connecting electrode 7 and prevent the relative displacement between the flexible connecting substrate 4 and the back panel substrate 3 with the moisture-proof insulating material 21. Therefore, disconnection of the connection electrode 7 of the flexible connection substrate 4 can be avoided.

(Modification of Second Embodiment of Information Display Panel Module According to the Present Invention)
Next, a modification of the second embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 8, the same components are denoted by the same reference numerals.
In FIG. 10B, reference numeral 28 denotes an information display panel module, and 27 denotes a buffer material layer.

  According to the modification of the second embodiment of the information display panel module according to the present invention described above, the conductive mounting portion side end surface 3a of the back side panel substrate 3 is formed on the flexible connection substrate 4 by the buffer material layer 27. Can prevent local contact of the connecting electrode 7 and prevent relative displacement between the flexible connecting substrate 4 and the back side panel substrate 3. Therefore, the disconnection of the connection electrode 7 of the flexible connection substrate 4 can be advantageously avoided.

(Another modification of the second embodiment of the information display panel module according to the present invention)
Next, another modification of the second embodiment of the information display panel module according to the present invention will be described with reference to FIG. Since the structure is the same as that shown in FIG. 9, the same components are indicated by the same reference numerals.
In FIG. 10C, reference numeral 29 denotes an information display panel module, and 27 denotes a buffer material layer.

  According to the modification of the second embodiment of the information display panel module according to the present invention described above, the conductive mounting portion side end surface 3a of the back side panel substrate 3 is formed on the flexible connection substrate 4 by the buffer material layer 27. Can prevent local contact of the connecting electrode 7 and prevent relative displacement between the flexible connecting substrate 4 and the back side panel substrate 3. 25, the disconnection of the connection electrode 7 of the flexible connection substrate 4 can be more advantageously avoided.

(General components of the information display panel used in the present invention)
Hereinafter, general components of the information display panel used in the present invention will be described.
As described above, the anisotropic conductive material is, for example, ACF, ACP, or ACS, and includes conductive particles in a film-like or paste-like bonding material.
The film-like or paste-like bonding material is cured to develop mechanical bonding strength, and the conductive particles develop electric connection between the opposing electrode terminals. If the gap between the electrode terminals of the connecting electrode terminals formed in a stripe shape is not larger than the particle diameter of the conductive particles, leakage occurs between the adjacent electrode terminals due to the conductive particles arranged between the adjacent electrode terminals. There is a risk. Therefore, it is important to use an anisotropic conductive material including conductive particles having an appropriate particle size in consideration of the gap between adjacent electrode terminals of the electrode terminal portion for connection. When designing the information display panel module, if the gap between the adjacent electrode terminals of the connecting electrode terminal portion is set to be three times or more the particle diameter of the conductive particles contained in the anisotropic conductive material, it is difficult to cause leakage. Further preferred.

As the moisture-proof insulating material, a material that has at least moisture permeation resistance, flexibility, insulation, and migration resistance and adheres to the panel substrate, the electrode terminal portion, and the connection substrate can be used.
A silicone resin, an acrylic resin, or an epoxy resin, which is any one of a solvent removal curing system, a humidity curing system, and an ultraviolet curing system, can be used.
The moisture-proof insulating material can be disposed by a method such as dispensing or spray coating.
The physical properties of the moisture-proof insulating material are more preferably as follows from the viewpoint of ease of manufacture and reliability after being incorporated into a product.
・ Viscosity 0.1 ～ 10 Pa ・ s (25 ℃)
・ Curing conditions In the case of UV curing system, 500 mJ to 2500 mJ
In the case of humidity curing system and solvent removal curing system, 25 ° C, 6 hours to 30 hours, volume resistance 1.0 × 10 ¹³ Ω / m to 1.0 × 10 ¹⁶ Ω / m
・ Moisture permeability: 1000 g / m ²・ 24 h or less ・ Ion concentration: Na ion and Cl ion: 10 ppm or less

  Moisture-proof insulating material disposed between the conductive mounting portion and the frame-shaped sealing material, and a moisture-proof insulating material disposed at the tip of the display surface side panel substrate and the flexible connection substrate on the conductive mounting portion side It is preferable to align the curing system. Moreover, it is desirable that both of the moisture-proof insulating materials described above are integrated with each other during the curing after their arrangement, and it is preferable to use materials that are compatible with each other.

The buffer material layer is preferably formed on the outer surface of the back panel substrate, but the sheet-like buffer material layer may be inserted between the back panel substrate and the flexible connection substrate. Good.
Moreover, it may not be a sheet-like layer, and it is good also as a layer in which the dot of the buffer material scattered is formed.
As the material of the buffer material layer, a material having a storage elastic modulus (E ′) in the range of 1.0 × 10 ⁴ Pa to 1.0 × 10 ⁹ Pa and exhibiting a buffer property is used. When the storage elastic modulus is less than 1.0 × 10 ⁴ Pa, sufficient shock-absorbing properties cannot be expressed when the corner portion of the conductive mounting portion side end surface of the rear panel substrate directly hits the flexible connection substrate, There is a risk of disconnection in the connection electrode, and if the storage elastic modulus exceeds 1.0 × 10 ⁹ Pa, there is a risk that an information display panel that is difficult to bend when used as a flexible information display panel module.

  The buffer material layer can be formed by any method as long as it satisfies the above conditions. For example, a commercially available adhesive or liquid rubber may be applied to the outer surface of the back panel substrate or arranged in a dot shape. And then drying, forming a natural rubber sheet or synthetic rubber sheet on the outer surface of the back panel substrate, or forming a sponge sheet such as a foamed urethane sheet or foamed rubber sheet on the back panel. It can be formed by bonding to the outer surface of the substrate.

  The thickness of the display surface side panel substrate is preferably in the range of 25 μm to 1000 μm, but in order to obtain a thin information display panel, the range of 25 μm to 500 μm is preferable, and further, the thickness of 25 μm to 200 μm. A range is preferred. As the display surface side panel substrate, a glass substrate can be used in addition to a resin substrate such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide, polyethylene sulfonate (PES).

  The thickness of the back side panel substrate is preferably in the range of 25 μm to 1000 μm, but in order to make a thin information display panel, the range of 25 μm to 500 μm is preferable, and further, the range of 25 μm to 200 μm. Is preferred. As the back panel substrate, organic polymer materials such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (PE), polycarbonate (PC), polyimide (PI), polyethersulfone (PES), acrylic, etc. A sheet, a glass substrate, a metal substrate whose surface is covered with an insulating film, or the like is used.

  In order to obtain an information display panel module that can be bent as a whole, the information display panel needs to have flexibility. In this case, the panel substrate is an organic polymer material substrate or a metal substrate among the above-described panel substrates. And a flexible substrate such as a glass substrate having a thickness of 200 μm or less, in other words, a flexible substrate is used. As the flexible substrate, a resin substrate or a metal substrate is preferable, but a glass substrate is also preferable because the flexibility can be obtained by setting the thickness to 200 μm or less. In the case of a resin substrate, flexibility can be obtained by setting the thickness to 5000 μm or less.

  In the display electrode (pixel electrode) arranged to face the information display screen region, a transparent electrode is provided in the transparent information display screen region of the display surface side panel substrate. Transparent electrode materials include indium tin oxide (ITO), indium oxide, zinc-doped indium oxide (IZO), aluminum-doped zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, and conductive zinc oxide. Transparent conductive metal oxides such as polyaniline, polyaniline, polypyrrole, and transparent conductive polymers including polythiophene such as Poly (3,4-ethylenedioxythiophene) -poly (Styrenesulfonate) (PEDOT: PSS). The thickness of the electrode provided in the information display screen region is preferably 0.01 μm to 10 μm, more preferably 0.05 μm to 5 μm, as long as electrical conductivity can be ensured and light transmittance is not hindered.

  In the display electrode (pixel electrode) disposed opposite to the information display screen region, the electrode provided on the back side panel substrate is indium tin oxide (ITO), indium oxide, zinc-doped indium oxide (IZO), aluminum-doped. Conductive metal oxides such as zinc oxide (AZO), antimony tin oxide (ATO), conductive tin oxide, conductive zinc oxide, polyaniline, polypyrrole, Poly (3, 4-ethylenedioxythiophene) -poly (Styrenesulfonate) (PEDOT : PSS) and other conductive polymers such as gold, silver, copper, aluminum, nickel and chromium, and alloys containing these conductive metals as main components. The display electrodes (pixel electrodes) provided in the information display screen area of the back panel substrate may be transparent or not transparent. In addition, the thickness of the display electrode (pixel electrode) provided in the information display screen area on the back side only needs to ensure conductivity, and is set in the range of 0.01 μm to 10 μm. The display electrode (pixel electrode), the wiring electrode extending from the display electrode (pixel electrode), and the conductive film constituting the connection terminal portion can be formed of the same conductive metal material. For example, after the copper thin film is formed on the back side substrate, patterning may be performed on each electrode, and the above three members can be formed at the same time.

  As a method for forming an electrode, a method of forming the above-described material into a thin film by sputtering, vacuum deposition, CVD (chemical vapor deposition), coating, or the like, a method of laminating a metal foil (for example, rolled copper foil), A method in which a conductive agent is mixed with a solvent or a synthetic resin binder and applied. The above-mentioned material that can be patterned and is electrically conductive can be preferably used.

Examples of the present invention will be described below.
In the invention example and the comparative example, a black and white two-color display medium (particle group A, particle group B) having different charging characteristics was used as the display medium.

  Particle group A consists of 60 parts by weight of methyl methacrylate monomer (Kanto Chemical Reagent) and 40 parts by weight of ethylene glycol dimethacrylate (Wako Pure Chemical Reagent) as a polyfunctional monomer having a plurality of polymerization reactive groups in one molecule. mol%), 3 parts by weight of a nigrosine compound (Bontron N07: manufactured by Orient Chemical) as a positively charge control agent, and 5 parts by weight of carbon black (special black: manufactured by Degussa) as a black pigment are dispersed by a sand mill. (Acrylic and methacrylic) Resin-Hydrocarbon-based resin block copolymer (Modiper F600: manufactured by Nippon Oil & Fats) 5 parts by weight was dissolved, and further 2 parts by weight of lauryl peroxide (Perroyl L: manufactured by Nippon Oil & Fats) was dissolved. The resulting solution was used as a surfactant for polyoxyethylene alkyl ether sodium sulfate (La (Mul E-118B: manufactured by Kao) suspended in 0.5% purified water, polymerized, filtered, dried, and then used with a classifier (MDS-2: Nippon Pneumatic Industry) with an average particle size of 9.2 μm. This is obtained as a group of positively charged black particles.

  Particle group B consists of 100 parts by weight of polymethylpentene polymer (TPX-R18; manufactured by Mitsui Chemicals), 100 parts by weight of titanium dioxide (Taipaque CR-90: manufactured by Ishihara Sangyo Co., Ltd.) as a colorant, and negative charge control. 5 parts by weight of a phenol-based condensate (Bontron E89: manufactured by Orient Chemical Co., Ltd.) is melt-kneaded with a twin-screw kneader and finely pulverized with a jet mill (Lab Jet Mill IDS-LJ type: manufactured by Nippon Pneumatic Co., Ltd.). The average particle size obtained by classifying using a classifier (MDS-2: Nihon Numatic Kogyo) and melt spheronizing using a melt spheronizer (MR-10: Nihon Numatic Kogyo) , 9.5 μm negatively charged white particles.

As the invention examples 1 and 2, the display medium described above and the display surface side panel substrate, the back side panel substrate, the flexible connection substrate, the anisotropic conductive material, and the moisture-proof insulating material which are the following specifications are used. 200 pieces of information display panel modules each having the structure shown in FIGS. Similarly, as Invention Example 3, 200 information display panel modules having the structure shown in FIG. However, for Invention Example 3, a buffer material layer having the following specifications was also used. Further, as a comparative example, 200 information display panel modules having the structure shown in FIG.
Display panel side panel substrate and back panel substrate: A transparent polyethylene terephthalate (PET) sheet with a thickness of 125 μm.
Display electrodes on the display surface side panel substrate and the back side panel substrate: ITO stripe electrodes, distance between electrodes 20 μm, electrode thickness 0.1 μm.
-Terminal area for connection of panel substrate on display surface side: ITO stripe electrode, electrode distance 20 μm, electrode thickness 0.1 μm.
・ Flexible connection board: An L-shaped wiring copper electrode (thickness 18 μm) is formed on a polyimide film with a thickness of 70 μm, covered with an insulating film, and one end of which is conductively mounted. FPC as a terminal part of the connecting electrode constituting the part.
-Terminal portion of the connection electrode of the flexible connection substrate: copper stripe electrode, distance between electrodes 20 μm, electrode thickness 18 μm.
Anisotropic conductive material: CP9842KS (conductive particle diameter: 6 μm) manufactured by Sony Chemical & Information Device.
-Moisture-proof insulating material: SA3220 manufactured by Sony Chemical & Information Device Co. was placed with a dispenser and cured using an ultraviolet irradiation spot lamp. The curing conditions were 1000 mJ / cm ² and the post-curing elastic modulus was 2.0 × 10 ⁸ Pa.
Buffer material layer: A foamed urethane sheet having a thickness of 1 mm was disposed on the entire surface of the rear panel substrate.

(Evaluation of information display panel module 1: Confirmation of disconnection prevention effect)
100 times each of the information display panel modules of Invention Examples 1 to 3 and Comparative Example were subjected to a bending test in the X direction (left-right direction in FIG. 7A) 100 times in an environment of 25 ° C. and 50% RH. After the bending test in the Y direction (vertical direction in FIG. 7A) was performed 100 times, a white solid image and a black solid image were displayed to check whether there was any problem in the display state. In the X-direction bending test, the information display panel module is installed horizontally, both ends thereof are clamped in the X direction, and the distance between chucks is reduced to 2/3 of the X-direction length of the information display panel module. Was performed by reverting. Similarly, in the Y-direction bending test, the information display panel module is installed horizontally, both ends thereof are sandwiched with the chuck in the Y direction, and the information display panel module is chucked between two-thirds of the length in the Y direction. It was executed by narrowing the distance and restoring it. The results are shown in Table 1.

(Information display panel module evaluation 2: Corrosion resistance confirmation)
For each of the information display panel modules of Invention Examples 1 to 3 and Comparative Example, a display test for displaying a white solid image and a black solid image after being placed in an environment of 25 ° C. and 80% RH for 30 days. I went to see if there was a problem with the display state. Before placing in the above environment, the circuit side terminal portion of the external drive device, which is the other terminal portion of the connection electrode of the flexible connection board mounted on the information display panel module, is made of silicone rubber. A display test was conducted by holding the sheet so that moisture did not enter the terminal part, removing the silicone rubber sheet, and connecting the terminal part to the connection terminal on the circuit side of the external drive device. The results are shown in Table 1.

  As shown in Table 1, according to the present invention, there is no problem in the display state, and the disconnection of the connection electrode of the flexible connection substrate in the vicinity of the conductive mounting portion side end surface of the rear panel substrate is completely eliminated. As a result, it was confirmed that an information display panel module with improved display quality can be stably supplied.

In accordance with the present invention, an information display panel module that avoids disconnection of the connection electrodes of the connection substrate in the vicinity of the end surface on the conductive mounting portion side of the rear panel substrate and improves display quality is disclosed in notebook computers, electronic notebooks, PDAs (Personal Digital Assistants), mobile information devices such as portable information devices, mobile phones and handy terminals, electronic paper such as electronic books, electronic newspapers, electronic manuals (electronic instruction manuals), signboards, posters, blackboards, whiteboards, etc. Bulletin boards, electronic desk calculators, home appliances, automotive supplies, display units, point cards, card displays such as IC cards, electronic advertising, information boards, electronic POPs (Point Of Presence, Point Of Purchase advertising), electronic price tags, In addition to electronic shelf labels, electronic musical scores, and display units for RF-ID devices, POS terminals, car navigation devices, watches, etc. It can be suitably used for display units of various information display devices. In addition, it is also suitable for a display unit of rewritable electronic paper that can be continuously displayed even after the connection is disconnected after the display is rewritten by being electrically connected to an external rewriting means.
As the driving method of the information display panel, various types of driving methods such as a passive matrix driving method and a static driving method that do not use a switching element in the panel itself, and an active driving method that uses a TFT element can be applied.

DESCRIPTION OF SYMBOLS 1 Information display panel module 2 Display surface side panel board | substrate 3 Back side panel board | substrate 4 Flexible connection board | substrate 5 Display electrode of display surface side panel board | substrate 6 Terminal part for connection of display surface side panel board | substrate 7 Flexible Connection electrode of connection substrate 8 Terminal portion of connection electrode of flexible connection substrate 9 Anisotropic conductive material 10 Display electrode of rear panel substrate 11 Connection terminal portion of rear panel substrate 12 TCP
DESCRIPTION OF SYMBOLS 13 Separation board | substrate gap ensuring board | substrate 14 Frame-shaped sealing material 15, 20, 22, 24, 26, 28, 29 Information display panel module 16 Moisture-proof insulating material 21, 23, 25 Moisture-proof insulating material 21a, 23a, 25a Moisture-proof Insulating material outer portion 21b, 23b, 25b Moisture-proof insulating material inner portion 21c, 23c, 25c Moisture-proof insulating material side edge portions 21d, 23d, 25d 23e, 25e Display surface side portion of moisture-proof insulating material 23f, 25f Back side portion of moisture-proof insulating material 27 Buffer material layer

Claims (3)

A display surface side panel substrate and a back side panel substrate disposed opposite to each other;
Display means for displaying information by electrical control between the opposing panel substrates via display electrodes;
A flexible connection substrate for connecting the display electrode to an external drive circuit;
A connection terminal portion installed on the inner surface of the display surface side panel substrate and connected to a terminal portion of a connection electrode disposed on the flexible connection substrate;
With
The flexible connection substrate is arranged without being folded along the surface of the back side panel substrate, and the connection terminal of the display surface side panel substrate is bent while the flexible connection substrate is bent. An information display panel module having a structure in which a portion and a terminal portion of a connection electrode of the flexible connection substrate are arranged close to each other and these two terminal portions are connected by an anisotropic conductive material,
In the conductive mounting portion having a structure in which the connection terminal portion of the display surface side panel substrate and the terminal portion of the connection electrode of the flexible connection substrate are connected by an anisotropic conductive material, at least the connection terminal And the electrode portions exposed from the anisotropic conductive material of each of the terminal portions of the connection electrode and the connection electrode are covered with a moisture-proof insulating material, and at least the conductive mounting portion side end surface of the back side panel substrate and the corner portion of the end surface An information display panel module, characterized in that the moisture-proof insulating material is formed so as to cover an end region including it.   In the vicinity of the conductive mounting portion, the moisture-proof insulating material is applied to the display surface side panel substrate from the conductive mounting portion surface to the end surface, the flexible connection substrate from the conductive mounting portion surface to the end surface, and these. Each of the two substrates is formed so as to extend to the end surfaces of the side edges on both sides, and the end regions of the conductive mounting portion and the display surface side panel substrate and the end regions of the flexible connection substrate are formed as described above. The information display panel module according to claim 1, wherein the information display panel module is wrapped with a moisture-proof insulating material.   3. The information display according to claim 1, wherein a buffer material layer is formed on an outer surface of the back side panel substrate so as to extend to a corner of the conductive mounting portion side end surface of the back side panel substrate. Panel module.

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