JP2018165828A - Method for manufacturing electro-optical display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an electro-optical display device that can prevent entry of corrosive gas.SOLUTION: A method for manufacturing an electro-optical display device according to the present invention includes the steps of: preparing a TFT substrate 2 that has an electrode 7 formed on a peripheral portion and a flexible circuit board 8 that is extended projecting outward from the TFT substrate 2 and has an electrode 9 formed at an end, and connecting the electrode 7 with the electrode 9; arranging a reinforcement plate 10 that is extended from the TFT substrate 2 over the flexible circuit board 8 so as to cover a connection portion of the electrode 7 and electrode 9 and has both lateral faces along the extended direction projecting from the flexible circuit board 8; and filling, with resin 11, over a portion on a surface of the flexible circuit board 8 on the opposite side of the surface on which the reinforcement plate 10 is arranged and projecting from the TFT substrate 2, a portion on a surface of the reinforcement plate 10 on which the flexible circuit board 8 is arranged and projecting from the flexible circuit board 8, and an end face of the TFT substrate 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for manufacturing an electro-optical display device. As an example of the electro-optical display device, there is a flat display device represented by, for example, a liquid crystal display device, a plasma display device, an organic EL (Electro Luminescence) display device, a field emission display device, and the like. Another example of the electro-optic display device is a touch panel display device having a touch panel on the flat display device.

  Recently, for example, liquid crystal display devices among electro-optic display devices whose applications have been diversified are used in various environments, and in particular, cases of use in corrosive gas atmospheres are increasing. The liquid crystal display device is equipped with electrodes provided on the display panel and various electronic components, and there is a concern that the functions of such electrodes and electronic components may be reduced by corrosive gas.

  As a countermeasure for the above problem, a technique for protecting an electrode and an electronic component by applying a resin to the surfaces of the electrode and the electronic component provided on the display panel has been disclosed (for example, see Patent Document 1). . Further, a technique for forming a protective layer by attaching a reinforcing plate or the like to electrodes and electronic components provided in a display panel is disclosed (for example, see Patent Document 2).

JP-A-10-54992 JP 2007-281378 A

  In Patent Document 1, a polarizing plate is provided so as to protrude from the substrate, and between the polarizing plate and the substrate, a resin is applied to the surface of the electrode terminal of the substrate and the surface of the connection portion between the electrode terminal of the substrate and the flexible printed circuit board. By filling, the terminal of the electrode of a board | substrate and the connection part of the terminal of the electrode of a board | substrate, and a flexible printed circuit board are protected (for example, refer FIG. 1 of patent document 1). However, since the electrodes formed on the flexible printed circuit board protruding from the resin filling part, especially the connection part, cannot be sufficiently filled with the resin, the corrosion entering from the cut surface which is the side surface of the flexible printed circuit board Sexual gas cannot be completely prevented. Accordingly, the electrodes of the flexible substrate are corroded by the corrosive gas, which causes a problem in display quality.

  In patent document 2, the copper foil for reinforcement which is a reinforcement board is provided on the flexible wiring board (for example, refer FIG. 1 of patent document 2). However, Patent Document 2 aims to prevent the electrodes of the flexible wiring board from being broken by mechanical stress, and cannot prevent the invasion of the corrosive gas.

  SUMMARY An advantage of some aspects of the invention is to provide a method of manufacturing an electro-optical display device capable of preventing the invasion of corrosive gas.

  In order to solve the above problems, an electro-optical display device manufacturing method according to the present invention includes a substrate having a first electrode formed on a peripheral portion thereof, a protrusion projecting outward from the substrate, and a first portion at an end portion. Preparing a flexible circuit board on which two electrodes are formed, connecting the first electrode and the second electrode, and covering the connecting portion between the first electrode and the second electrode from the substrate The step of arranging a reinforcing plate extending over the flexible circuit board and projecting from the flexible circuit board on both sides along the extending direction is opposite to the surface of the flexible circuit board on which the reinforcing plate is arranged. A step of filling a resin across a portion of the side surface protruding from the substrate, a portion of the reinforcing plate on the side where the flexible circuit substrate is disposed and protruding from the flexible circuit substrate, and an end surface of the substrate Including.

  According to the present invention, a method of manufacturing an electro-optic display device includes a substrate having a first electrode formed at a peripheral portion, a protruding and extending outward of the substrate, and a second electrode formed at an end portion. Preparing a flexible circuit board, connecting the first electrode and the second electrode, and extending from the board to the flexible circuit board so as to cover a connection portion between the first electrode and the second electrode; A step of disposing a reinforcing plate whose both side surfaces along the extending direction are protruded from the flexible circuit board, and a surface opposite to the surface on which the reinforcing plate of the flexible circuit substrate is disposed. Corrosive because it includes a portion protruding from the substrate, a surface of the reinforcing plate on the side where the flexible circuit board is disposed and protruding from the flexible circuit substrate, and a step of filling the resin over the end surface of the substrate. Prevent gas ingress It can become.

It is a top view which shows an example of a structure of the liquid crystal display device by Embodiment 1 of this invention. It is a top view which shows an example of a structure of the liquid crystal display device by Embodiment 1 of this invention. It is sectional drawing which shows an example of a structure of the liquid crystal display device by Embodiment 1 of this invention. It is a side view which shows an example of a structure of the liquid crystal display device by Embodiment 1 of this invention. It is a top view which shows an example of a structure of the liquid crystal display device by the comparative example of Embodiment 1 of this invention. It is sectional drawing which shows an example of a structure of the liquid crystal display device by the comparative example of Embodiment 1 of this invention. It is a side view which shows an example of a structure of the liquid crystal display device by the comparative example of Embodiment 1 of this invention. It is sectional drawing which shows an example of a structure of the liquid crystal display device by the modification of Embodiment 1 of this invention. It is a top view which shows an example of a structure of the touchscreen by Embodiment 2 of this invention. It is sectional drawing which shows an example of a structure of the touchscreen by Embodiment 2 of this invention. It is a side view which shows an example of a structure of the touchscreen by Embodiment 2 of this invention. It is a top view which shows an example of a structure of the touchscreen by the comparative example of Embodiment 2 of this invention. It is sectional drawing which shows an example of a structure of the touchscreen by the comparative example of Embodiment 2 of this invention. It is a side view which shows an example of a structure of the touchscreen by the comparative example of Embodiment 2 of this invention. It is sectional drawing which shows an example of a structure of the touchscreen by the modification of Embodiment 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1>
In Embodiment 1 of the present invention, a liquid crystal display device will be described as an example of an electro-optical display device.

  FIG. 1 is a plan view showing an example of the configuration of the liquid crystal display device according to Embodiment 1 of the present invention, and shows a part of the configuration of the liquid crystal display device. FIG. 2 is an enlarged view of a portion surrounded by a broken line in FIG. 3 is a cross-sectional view taken along line A1-A2 of FIG. 4 is a side view seen from the −Y-axis direction side of FIGS.

  The liquid crystal display device according to the first embodiment includes a CF (Color Filter) substrate 1 and a TFT (Thin Film Transistor) substrate 2, and the liquid crystal 5 is sealed between the CF substrate 1 and the TFT substrate 2. It is sealed by. A CF polarizing plate 3 is provided on the surface of the CF substrate 1 opposite to the liquid crystal 5, and a TFT polarizing plate 4 is provided on the surface of the TFT substrate 2 opposite to the liquid crystal 5.

  An electrode 7 (first electrode) is formed on the surface of the TFT substrate 2 on the CF substrate 1 side and outside the sealing material 6 (peripheral portion of the TFT substrate 2). The flexible circuit board 8 has an electrode 9 (second electrode) formed at an end thereof connected to an electrode 7 formed on the TFT substrate 2 and extends beyond the periphery of the TFT substrate 2 to the outside of the TFT substrate 2. Projecting (projecting in the −Y-axis direction). Examples of the flexible circuit board 8 include COF (Chip On Film) and FPC (Flexible Printed Circuit).

  The reinforcing plate 10 extends from the TFT substrate 2 to the flexible circuit substrate 8 so as to cover the connection portion between the electrode 7 and the electrode 9. The width of the reinforcing plate 10 in the X-axis direction is larger than the width of the flexible circuit board 8 in the X-axis direction. That is, both side surfaces along the extending direction (Y-axis direction) of the reinforcing plate 10 protrude from the flexible circuit board 8.

  The resin 11 (first resin) is a surface of the flexible circuit board 8 opposite to the reinforcing plate 10 (on the −Z axis direction side) and protrudes from the TFT substrate 2, and the flexible circuit board of the reinforcing plate 10. It is formed (filled) across the portion on the side of 8 that protrudes from the flexible circuit board 8 and the cut surface 12 (end surface) of the TFT substrate 2.

  The CF substrate 1 and the TFT substrate 2 are mainly made of an insulating member containing a resin such as glass, plastic, or film. The electrode 7 and the electrode 9 are conductive members such as metal. The resin 11 is an insulating member. The reinforcing plate 10 is, for example, an adhesive film or the like, and is a base material in which an insulating member is subjected to an insulating process on a surface where the insulating member is in contact with the base material or the electrode 7. When the flexible circuit board 8 can be bent at the part where the electrode 7 and the electrode 9 are connected (peripheral part of the TFT substrate 2), the reinforcing plate 10 is a thin and flexible material such as a film. It becomes. Further, the reinforcing plate 10 is provided along the base as shown in FIGS. 3 and 4 (along the surfaces of the electrode 7 and the flexible circuit board 8), but may be made of a hard material (rigid).

  As shown in FIGS. 3 and 4, by providing the reinforcing plate 10, the resin 11 can be efficiently filled into the cut surface 12 of the TFT substrate 2 and the cut surface 13 of the flexible circuit board 8. Specifically, the resin 11 stays in close contact with the cut surface 12 of the TFT substrate 2 from the back surface of the portion of the reinforcing plate 10 that protrudes from the flexible circuit substrate 8, so that the cut surface 13 of the flexible circuit substrate 8. A resin layer made of resin 11 is formed. That is, a resin made of the resin 11 effective to prevent the corrosive gas entering the electrodes 7 and 9 from the cut surface 13 of the flexible circuit board 8 or the adhesive interface between the cut surface 13 of the flexible circuit board 8 and the resin 11. A layer (protective layer) is formed. The resin 11 should have a relatively high viscosity so that the resin 11 tends to stay on the cut surface 12 of the TFT substrate 2 from the back surface of the portion protruding from the flexible circuit board 8 of the reinforcing plate 10.

<Comparative example>
Next, a comparative example for explaining the effect of the liquid crystal display device according to the first embodiment will be described.

  FIG. 5 is a plan view showing an example of the configuration of a liquid crystal display device according to a comparative example. 6 is a B1-B2 cross-sectional view of FIG. FIG. 7 is a side view seen from the −Y-axis direction side of FIGS.

  As shown in FIGS. 5-7, in the comparative example, the reinforcement board 10 as shown in FIGS. 1-4 is not provided. Accordingly, the resin 11 is formed so as to cover only the surface on the back surface side (the −Z axis direction side) of the flexible circuit board 8, and the cut surface 13 of the flexible circuit board 8 is exposed. In the comparative example, since the resin 11 cannot be efficiently fastened to the cut surface 12 of the TFT substrate 2, the cut surface 13 of the flexible circuit substrate 8 or the bonding interface between the cut surface 13 of the flexible circuit substrate 8 and the resin 11 is used. Therefore, the corrosive gas entering the electrodes 7 and 9 cannot be prevented.

  From the above, according to the first embodiment, the connection portion between the electrode 7 formed on the TFT substrate 2 and the electrode 9 formed on the flexible circuit substrate 8 is covered and protrudes from the flexible circuit substrate 8. By providing the reinforcing plate 10 on the surface, the cut surface 13 of the flexible circuit board 8 can be sufficiently filled with the resin 11 and fastened. Therefore, the corrosiveness that penetrates the electrodes 7 and 9 from the cut surface 13 of the flexible circuit board 8 is achieved. Gas can be effectively prevented. Accordingly, it is possible to suppress display quality defects in the electro-optical display device (the liquid crystal display device in the first embodiment).

  Further, since the reinforcing plate 10 is provided so as to protrude from the flexible circuit board 8, the resin 11 filled in the cut surface 12 of the TFT substrate 2 is likely to stay, and the thickness of the resin 11 increases. Corrosive gas entering the electrodes 7 and 9 from the cut surface 13 can be effectively prevented.

  Further, since the reinforcing plate 10 is provided so as to cover the connection portion between the electrode 7 and the electrode 9, the reinforcing plate 10 functions as a protective layer that protects the surface of the flexible circuit board 8. Corrosive gas entering from the inside can be prevented.

<Modification>
Next, a modification of the first embodiment will be described.

  FIG. 8 is a cross-sectional view showing an example of the configuration of a liquid crystal display device according to a modification. FIG. 8 corresponds to FIG.

  As shown in FIG. 8, the liquid crystal display device according to the modification is characterized by including a resin 14 (second resin). Since other configurations are the same as those of the liquid crystal display device according to the first embodiment (FIGS. 2 to 4), the description thereof is omitted here.

  The resin 14 is formed from the surface of the electrode 7 formed on the TFT substrate 2 to the surface of the flexible circuit board 8. That is, the resin 14 is formed so as to cover the connection portion between the electrode 7 and the electrode 9. The reinforcing plate 10 is provided so as to cover the resin 14.

  From the above, even if the liquid crystal display device is configured as in the above modification, the same effect as in the first embodiment can be obtained.

  In FIG. 1, the reinforcing plate 10 is integrated over the two sides (the X-axis direction side and the Y-axis direction side in FIG. 1) on the side of the TFT substrate 2 where the flexible circuit board 8 is provided. However, the present invention is not limited to this. For example, the reinforcing plate 10 may be separately provided on the peripheral edge portion of the TFT substrate 2 on the X-axis direction side and the Y-axis direction side. Further, the reinforcing plate 10 may be provided so as to individually cover each flexible circuit board 8 in the peripheral portion of the TFT substrate 2. As described above, by providing the plurality of reinforcing plates 10 at the peripheral portion of the TFT substrate 2, the reinforcing plate 10 can be easily attached to the peripheral portion of the TFT substrate 2, and the attaching accuracy is improved.

<Embodiment 2>
In Embodiment 2 of the present invention, a touch panel in a touch panel display device including a touch panel on a flat display device will be described as an example of an electro-optical display device.

  FIG. 9 is a plan view showing an example of the configuration of the touch panel according to Embodiment 2 of the present invention, and shows a part of the configuration of the touch panel. 10 is a cross-sectional view taken along line C1-C2 of FIG. FIG. 11 is a side view seen from the −Y-axis direction side of FIGS. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 1 (FIGS. 1-4), and detailed description is abbreviate | omitted.

  As shown in FIGS. 9 to 11, in the touch panel according to the second embodiment, an electrode 16 (first electrode) is formed on the touch panel substrate 15. The flexible circuit board 8 has an electrode 9 (second electrode) formed at an end thereof connected to an electrode 16 formed on the touch panel substrate 15 and extends beyond the periphery of the touch panel substrate 15 to the outside of the touch panel substrate 15. Projecting (projecting in the −Y-axis direction).

  Note that the touch panel substrate 15 is mainly made of an insulating member containing a resin such as glass, plastic, or film as in the case of the CF substrate 1 and the TFT substrate 2 in the first embodiment. Further, the electrode 16 is a conductive member such as a metal like the electrode 7 and the electrode 9 in the first embodiment.

  The reinforcing plate 10 extends from the touch panel substrate 15 to the flexible circuit board 8 so as to cover a connection portion between the electrode 16 and the electrode 9. The width of the reinforcing plate 10 in the X-axis direction is larger than the width of the flexible circuit board 8 in the X-axis method. That is, both side surfaces along the extending direction (Y-axis direction) of the reinforcing plate 10 protrude from the flexible circuit board 8.

  The resin 11 (first resin) is a surface of the flexible circuit board 8 opposite to the reinforcing plate 10 (on the −Z-axis direction side) and protrudes from the touch panel substrate 15, and the flexible circuit board of the reinforcing plate 10. It is formed (filled) across the portion on the side of 8 that protrudes from the flexible circuit board 8 and the cut surface 17 of the touch panel substrate 15.

  As shown in FIGS. 10 and 11, by providing the reinforcing plate 10, the resin 11 can be efficiently filled into the cut surface 17 of the touch panel substrate 15 and the cut surface 13 of the flexible circuit board 8. Specifically, the resin 11 stays in direct contact with the cut surface 17 of the touch panel substrate 15 from the back surface of the portion of the reinforcing plate 10 that protrudes from the flexible circuit substrate 8, whereby the cut surface 13 of the flexible circuit substrate 8. A resin layer made of resin 11 is formed. That is, the resin made of the resin 11 effective to prevent the corrosive gas entering the electrodes 9 and 16 from the cut surface 13 of the flexible circuit board 8 or the adhesive interface between the cut surface 13 of the flexible circuit board 8 and the resin 11. A layer (protective layer) is formed. The resin 11 should have a relatively high viscosity so that the resin 11 tends to stay on the cut surface 17 of the touch panel substrate 15 from the back surface of the portion protruding from the flexible circuit board 8 of the reinforcing plate 10.

<Comparative example>
Next, a comparative example for explaining the effect of the touch panel according to the second embodiment will be described.

  FIG. 12 is a plan view illustrating an example of a configuration of a touch panel according to a comparative example. 13 is a cross-sectional view taken along the line D1-D2 of FIG. FIG. 14 is a side view seen from the −Y-axis direction side of FIGS.

  As shown in FIGS. 12-14, in the comparative example, the reinforcing plate 10 as shown in FIGS. 9-11 is not provided. Accordingly, the resin 11 is formed so as to cover only the surface on the back surface side (the −Z axis direction side) of the flexible circuit board 8, and the cut surface 13 of the flexible circuit board 8 is exposed. In the comparative example, since the resin 11 cannot be efficiently fastened to the cut surface 17 of the touch panel substrate 15, the cut surface 13 of the flexible circuit board 8 or the adhesive interface between the cut surface 13 of the flexible circuit board 8 and the resin 11 is used. Therefore, corrosive gas entering the electrodes 9 and 16 cannot be prevented.

  From the above, according to the second embodiment, the connection portion between the electrode 16 formed on the touch panel substrate 15 and the electrode 9 formed on the flexible circuit board 8 is covered and protrudes from the flexible circuit board 8. Since the reinforcing plate 10 is provided on the cut surface 13 of the flexible circuit board 8, the resin 11 can be sufficiently filled with the resin 11, and the corrosiveness that penetrates the electrodes 9 and 16 from the cut surface 13 of the flexible circuit board 8 can be secured. Gas can be effectively prevented. Therefore, it is possible to suppress display quality defects in the electro-optical display device (in the second embodiment, the touch panel display device).

  Further, since the reinforcing plate 10 is provided so as to protrude from the flexible circuit board 8, the resin 11 filled in the cut surface 17 of the touch panel substrate 15 is likely to stay and the thickness of the resin 11 is increased. Corrosive gas entering the electrodes 9 and 16 from the cut surface 13 can be effectively prevented.

  Further, since the reinforcing plate 10 is provided so as to cover the connection portion between the electrode 16 and the electrode 9, the reinforcing plate 10 functions as a protective layer that protects the surface of the flexible circuit board 8. Corrosive gas entering from the inside can be prevented.

<Modification>
Next, a modification according to the second embodiment will be described.

  FIG. 15 is a cross-sectional view illustrating an example of a configuration of a touch panel according to a modification. FIG. 15 corresponds to FIG.

  As shown in FIG. 15, the touch panel according to the modification includes a resin 18 (second resin). Other configurations are the same as those of the touch panel according to the second embodiment (FIGS. 9 to 11), and thus description thereof is omitted here.

  The resin 18 is formed from the surface of the electrode 16 formed on the touch panel substrate 15 to the surface of the flexible circuit board 8. That is, the resin 18 is formed so as to cover the connection portion between the electrode 18 and the electrode 9. The reinforcing plate 10 is provided so as to cover the resin 18.

  From the above, even if the touch panel is configured as in the above modification, the same effect as in the second embodiment can be obtained.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  1 CF substrate, 2 TFT substrate, 3 CF polarizing plate, 4 TFT polarizing plate, 5 liquid crystal, 6 sealing material, 7 electrodes, 8 flexible circuit board, 9 electrodes, 10 reinforcing plate, 11 resin, 12, 13 cut surface, 14 Resin, 15 touch panel substrate, 16 electrodes, 17 cut surface, 18 resin.

Claims (6)

Preparing a substrate having a first electrode formed on a peripheral portion thereof and a flexible circuit substrate extending outwardly from the substrate and having a second electrode formed at an end thereof; Connecting the second electrode to the second electrode;
The flexible circuit board extends from the substrate to the flexible circuit board so as to cover a connection portion between the first electrode and the second electrode, and both side surfaces along the extending direction are the flexible circuit board. Arranging a reinforcing plate protruding from
The surface of the flexible circuit board opposite to the surface on which the reinforcing plate is disposed, the portion protruding from the substrate, and the surface of the reinforcing plate on the side on which the flexible circuit board is disposed, the flexible circuit substrate. Filling the resin over the protruding portion and the end surface of the substrate;
A method for manufacturing an electro-optic display device.   The method of manufacturing an electro-optical display device according to claim 1, wherein the resin covers a side surface of the flexible circuit board and an end surface of the substrate.   The electro-optic display device according to claim 1, further comprising a step of providing a resin that covers a connection portion between the first electrode of the substrate and the second electrode of the flexible substrate. Production method. Preparing a substrate having a first electrode formed on a peripheral portion thereof and a flexible circuit substrate extending outwardly from the substrate and having a second electrode formed at an end thereof; And connecting the second electrode with a resin;
The flexible circuit board extends from the substrate to the flexible circuit board so as to cover a connection portion between the first electrode and the second electrode, and both side surfaces along the extending direction are the flexible circuit board. Arranging a reinforcing plate protruding from
The surface of the flexible circuit board opposite to the surface on which the reinforcing plate is disposed, the portion protruding from the substrate, and the surface of the reinforcing plate on the side on which the flexible circuit board is disposed, the flexible circuit substrate. A step of disposing a resin across a portion protruding from the end surface of the substrate;
A method for manufacturing an electro-optic display device.   5. The method for manufacturing an electro-optic display device according to claim 1, wherein the substrate is a TFT (Thin Film Transistor) substrate.   The method for manufacturing an electro-optical display device according to claim 1, wherein the substrate is a touch panel substrate.

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