JP2018141848A - Display device and manufacturing method thereof - Google Patents

Abstract

A display device capable of suppressing breakage of wiring and the like even when a display panel is bent is provided. A display device includes a display panel including a display area, a terminal area provided with terminals, and a bendable bending area positioned between the display area and the terminal area, and a display surface of the display panel. is a back film attached to the opposite back surface, the back film including a first film portion attached to the back surface of the display area and a second film portion attached to the back surface of the terminal area; and a spacer. Then, the bending region is bent so that the terminal region and the second film portion are positioned on the rear surface side of the display region and the first film portion, and the spacer is sandwiched between the first film portion and the second film portion, and the rear surface of the bending region is positioned. and an end surface of at least one of the first film portion and the second film portion facing the bent region has a slope so as to protrude outward toward the back surface. [Selection drawing] Fig. 2

Description

  The present invention relates to a display device and a manufacturing method thereof.

  In recent years, in order to reduce the size of a display device or expand the display area, it is required to narrow a so-called frame area around the display area (narrow frame). In particular, in mobile devices such as smartphones, there is an increasing demand for narrow frame.

  As an example of narrowing the frame, in Patent Document 1 below, in a bendable display panel using a flexible resin film as a base material, the outer frame of the display region is bent to the back side to narrow the frame. It is disclosed to attempt to make it easier.

JP 2016-31499 A

  By the way, when a display panel is bent, wiring or the like may be damaged due to stress acting on the bent portion. Therefore, it is considered to provide a spacer for guiding the bending of the display panel to suppress excessive bending. . However, even if the spacer is provided, stress is likely to concentrate at a location that is the starting point of bending of the display panel, and thus the wiring or the like may still be damaged at that location.

  An object of the present invention is to provide a display device and a method for manufacturing the same that can suppress damage to wiring and the like even when the display panel is bent.

  In order to solve the above problems, a display device according to the present invention includes a display area, a terminal area provided with terminals, and a bendable bending area positioned between the display area and the terminal area. And a second film that is attached to the rear surface opposite to the display surface of the display panel, the first film portion that is attached to the rear surface of the display area, and the second film that is attached to the rear surface of the terminal area. A back film including a portion, a spacer, wherein the bent region is bent and the terminal region and the second film portion are located on the back side of the display region and the first film portion, and the spacer is A spacer sandwiched between the first film portion and the second film portion and in contact with the back surface of the bent region, and at least of the first film portion and the second film portion The end face facing the square the bending area of has a slope so as to protrude outward toward the the back.

  The display device manufacturing method of the present invention provides a display panel that includes a display region, a terminal region provided with terminals, and a bendable bent region located between the display region and the terminal region. And a step of attaching a back film to the back surface opposite to the display surface of the display panel, wherein the first film portion is attached to the back surface of the display region, and the second film portion is attached to the back surface of the terminal region. Bonding the bending region, bending the display region and the back surface side of the first film portion, positioning the terminal region and the second film portion, and attaching a spacer to the first film portion and the first film portion. And an end face facing at least one of the bent regions of the first film portion and the second film portion is a front surface. It has a gradient so as to protrude outward toward the back surface.

It is a top view of the display apparatus which concerns on embodiment. It is sectional drawing when cut | disconnecting by the II-II line | wire shown in FIG. It is a figure which shows the 1st process of the manufacturing method of the display apparatus which concerns on embodiment. It is a figure which shows the following 2nd process. It is sectional drawing when it cut | disconnects by the 4B-4B line | wire shown to FIG. 4A. It is a figure which shows the following 3rd process. It is sectional drawing when it cut | disconnects by the 5B-5B line | wire shown to FIG. 5A. It is a figure which shows the 4th process following. It is a figure which shows the 5th process following. It is a figure which shows a modification.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part as compared with the embodiment for clarity of explanation, but are merely examples, and the interpretation of the present invention may be It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

  Furthermore, in the detailed description of the embodiment of the present invention, when defining the positional relationship between a certain component and another component, “above” and “below” are located immediately above or directly below a certain component. In addition to the case, unless otherwise specified, the case where other components are further interposed is included.

  FIG. 1 is a plan view of a display device 1 according to the embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. As an example of the display device, an organic EL display device including an organic light emitting diode as a display element is given. The arrow F in the figure represents the display surface side, and the arrow R represents the back surface side. The display device 1 includes a bendable display panel 10 using a flexible film as a base material. The flexible film is formed of a resin material such as polyimide, for example. The display panel 10 includes a display area A, a frame area B surrounding the display area A, a bent area C adjacent to one side of the frame area B, and a terminal area D adjacent to the bent area C.

  In the display area A, for example, full-color pixels P obtained by combining a plurality of color unit pixels (sub-pixels) made of red, green, and blue are arranged in a matrix. A peripheral circuit may be arranged in the frame area B. Terminals (not shown) are provided in the terminal region D, and an IC chip (integrated circuit chip) 18 and an FPC (flexible printed circuit board) 19 are connected to each other. The pixel P in the display area A and the terminal in the terminal area D are connected to each other via a wiring (not shown) that passes through the frame area B and the bent area C. The display panel 10 is bent in the bending area C, and the terminal area D is located on the back side of the display area A. Thereby, narrowing of the frame is realized.

  As shown in FIG. 2, the back film 2 is attached to the back surface of the display panel 10. The back film 2 is formed of, for example, a resin material such as PET, and is attached to the display panel 10 with, for example, a resin adhesive. The back film 2 includes a first film part 21 attached to the back surface of the display area A and the frame area B, and a second film part 22 attached to the back surface of the terminal area D. The back film 2 is not attached to the bent region C.

  The bent area C is bent, and the terminal area D and the second film part 22 are located on the display area A, the frame area B, and the back side of the first film part 21. That is, the first film portion 21 and the second film portion 22 are located inside the bent display panel 10. The back surface of the first film part 21 and the back surface of the second film part 22 are opposed to each other. Specific shapes of the first film portion 21 and the second film portion 22 will be described later.

  An optical transparent film 31 is provided on the display surface side of the display panel 10. The optical transparent film 31 is formed of a resin material such as PET. A circularly polarizing film 33 is provided on the optically transparent film 31, and a cover glass 35 is provided on the circularly polarizing film 33.

  A laminated film 4 is attached to the back surface of the first film portion 21. The laminated film 4 includes a buffer film 41, a first heat dissipation film 43, a second heat dissipation film 45 and an adhesive tape 47. The buffer film 41 is also called a cushion tape, and is made of, for example, a resin foam material. The first heat dissipation film 43 and the second heat dissipation film 45 are films formed of a metal such as graphite or copper, for example.

  The surface of the bent region C that is bent is covered with the protective film 5. The protective film 5 is formed of a resin material such as an epoxy resin, for example. The protective film 5 is formed, for example, by applying a liquid resin material to the surface of the bent region C that is bent, and curing it.

  In the present embodiment, a spacer 6 for guiding the bending of the bending region C of the display panel 10 is disposed between the first film portion 21 and the second film portion 22 of the back film 2. The spacer 6 is sandwiched between the first film portion 21 and the second film portion 22 and is in contact with the back surface of the bent region C. Excessive bending of the bending region C is suppressed by the spacer 6 and a certain bending is maintained.

  The spacer 6 includes a sandwiched portion 61 sandwiched between the first film portion 21 and the second film portion 22, and a projecting portion 633 that projects outward from the sandwiched portion 61 and contacts the back surface of the bent region C. ing. More specifically, the spacer 6 includes a main body 63 having a base portion 631 and a protruding portion 633, and adhesive layers 62 and 64 that sandwich the base portion 631 of the main body 63. The sandwiched portion 61 includes a base portion 631 of the main body 63 and adhesive layers 62 and 64 sandwiching the base portion 631.

  The main body 63 is affixed to the back surface of the first film portion 21 via the adhesive layer 62, and is affixed to the back surface of the second film portion 22 via the adhesive layer 64. The main body 63 is formed of, for example, a resin molded product. The adhesive layers 62 and 64 are formed of, for example, a resin adhesive or a double-sided tape. The tip of the protrusion 633 expands in a mushroom shape in a side view and has a contact surface that is bent along the bent region C.

  The end surfaces 213 and 224 of the first film portion 21 and the second film portion 22 that face the bent region C of the display panel 10 have a gradient so as to protrude outward as approaching the back surface. Since both of the end surfaces 213 and 224 have a gradient, the end surfaces 213 and 224 have a tapered shape with the back surface portion protruding outward as a whole. The end surfaces 213 and 224 are not limited to all, and only a part (for example, a part on the display surface side) may have a gradient. Further, only one of the end faces 213 and 224 may have a gradient.

  The end surfaces 213 and 224 having the gradients of the first film portion 21 and the second film portion 22 have convex curved surfaces on the display panel 10 side. That is, the gradients of the end surfaces 213 and 224 are gradually increased toward the back surface.

  End surfaces 213 and 224 having gradients of the first film portion 21 and the second film portion 22 are in contact with the back surface of the bent region C of the display panel 10. The end surfaces 213 and 224 have convex curved surfaces on the display panel 10 side, so that the entire end surfaces 213 and 224 are in contact with the back surface of the bent region C. The end surfaces 213 and 224 are not limited to all, and only a part of the end surfaces may contact the back surface of the bent region C.

  The end surfaces 213 and 224 having the gradients of the first film portion 21 and the second film portion 22 are located outside the position where the spacer 6 is attached to the first film portion 21 or the second film portion 22. Specifically, the end surface 213 of the first film portion 21 is located outside the adhesive layer 62 of the spacer 6 that is attached to the back surface of the first film portion 21, and the end surface 224 of the second film portion 22 is The second film portion 22 is located outside the adhesive layer 64 of the spacer 6 attached to the back surface of the second film portion 22. The end faces 213 and 224 are not limited to all, and only part of the end faces 213 and 224 may be located outside the adhesive layers 62 and 64.

  Since the first film portion 21 of the back film 2 and the end surfaces 213 and 224 of the second film portion 22 are configured as described above, a location that serves as a fulcrum for bending the bending region C of the display panel 10 (for example, a bending region) It is possible to suppress breakage of wirings included in the boundary portion of C).

  3 to 7 are views showing a method for manufacturing the display device according to the embodiment.

  FIG. 3 is a diagram showing the first step. The first step is a step of preparing the display panel 10. The figure shows the display panel 10 before bending in a plan view. The display panel 10 includes a display area A, a frame area B surrounding the display area A, a bent area C adjacent to one side of the frame area B, and a terminal area D adjacent to the bent area C. An IC chip 18 and an FPC 19 are connected to the terminal region D.

  FIG. 4A is a diagram showing a second step. The second step is a step of preparing the back film 2. The figure shows the back film 2 before bending in a plan view. 4B is a cross-sectional view taken along line 4B-4B shown in FIG. 4A. The back film 2 has a first film part 21 and a second film part 22. Between the 1st film part 21 and the 2nd film part 22, the penetration groove | channel 2a where the end surface 213 of the 1st film part 21 and the end surface 224 of the 2nd film part 22 face each other is formed. Moreover, the back film 2 has the connection part 25 which connects the 1st film part 21 and the 2nd film part 22 at the both ends of the penetration groove | channel 2a.

  As shown in FIG. 4B, the end surfaces 213 and 224 of the first film portion 21 and the second film portion 22 have a gradient so as to protrude outward as they approach the back surface. Further, the end surfaces 213 and 224 have convex curved surfaces on the display surface side. The end surfaces 213 and 224 are formed, for example, by chamfering corners on the display surface side after punching.

  FIG. 5A is a diagram showing a third step. The third step is a step of attaching the back film 2 to the back surface of the display panel 10. The figure shows the display panel 10 and the back film 2 that are attached to each other before being bent in a plan view. 5B is a cross-sectional view taken along line 5B-5B shown in FIG. 5A. The first film portion 21 is attached to the back surface of the display region A and the frame region B, and the second film portion 22 is attached to the back surface of the terminal region D. The through groove 2a is located on the back surface of the bent region C, and the back film 2 is not pasted. The connecting portion 25 of the back film 2 is not attached to the display panel 10 and protrudes to the side of the display panel 10 in plan view.

  FIG. 6 is a diagram showing a fourth step. The fourth step is a step of bending the bending region C of the display panel 10. This figure shows a state in the middle of bending. In the figure, only the display panel 10 and the back film 2 are shown, and the other components are not shown. By bending the bending area C, the terminal area D and the second film part 22 are positioned on the back side of the display area A, the frame area B, and the first film part 21.

  In the present embodiment, the bending of the bending region C is guided by the spacer 6. Specifically, first, the spacer 6 is attached to the back surface of the first film portion 21 with the adhesive layer 62. Next, the bending area C is bent. Here, the bent region C is bent from the middle while the protrusion 633 of the spacer 6 is brought into contact with the back surface of the bent region C. Next, the spacer 6 is sandwiched between the first film portion 21 and the second film portion 22, and the spacer 6 is attached to the back surface of the second film portion 22 by the adhesive layer 64. Note that the order of attaching the spacers 6 may be reversed.

  According to this, since the end surfaces 213 and 224 of the first film portion 21 and the second film portion 22 have a gradient so as to protrude outward as they approach the back surface, a location that serves as a fulcrum for bending in the bending region C ( For example, it is possible to suppress breakage of wirings included in the boundary portion of the bent region C).

  FIG. 7 shows the fifth step. The fifth step is a step of cutting off the connecting portion 25 from the back film 2. The figure shows the display panel 10 after bending in a plan view. The connecting portion 25 of the back film 2 is bent as the display panel 10 is bent. However, since the back film 2 is thicker than the display panel 10, the connecting portion 25 is swollen compared to the bent region C. The back film 2 is cut along the outer edge of the display panel 10, whereby the connecting portion 25 is cut off from the back film 2.

  An optical transparent film 31, a circularly polarizing film 33, and a cover glass 35 are provided on the display surface of the display panel 10 (see FIG. 2). These are provided in the first step of preparing the display panel 10, for example, but may be provided in other steps. Moreover, the laminated film 4 is provided in the back surface of the back film 2 (refer FIG. 2). This is provided in the second step of preparing the back film 2, for example, but may be provided in another step.

  FIG. 8 is a diagram showing a modification. As shown in the figure, the end surfaces 214 and 225 of the first film portion 21 and the second film portion 22 may have inclined planes having a certain gradient so as to protrude outward as they approach the back surface. Even if configured in this way, it is possible to suppress breakage of wirings and the like included in a portion (for example, a boundary portion of the bending region C) that serves as a bending fulcrum of the bending region C of the display panel 10.

  In the present embodiment, the case of an organic EL display device has been exemplified as a disclosure example, but as other application examples, a liquid crystal display device, another self-luminous display device, or an electronic paper display device having an electrophoretic element or the like Any flat panel display device can be used. Moreover, it cannot be overemphasized that it can apply, without specifically limiting from a small size to a large size.

  In the scope of the idea of the present invention, those skilled in the art can conceive various changes and modifications, and it is understood that these changes and modifications also belong to the scope of the present invention. For example, those in which the person skilled in the art appropriately added, deleted, or changed the design of the above-described embodiments, or those in which the process was added, omitted, or changed the conditions are also included in the gist of the present invention. As long as it is provided, it is included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Display apparatus, 10 Display panel, A Display area, B Frame area, C bending area, D terminal area, P pixel, 18 IC chip, 19 FPC, 2 Back film, 21 1st film part, 213 End surface, 22 2nd Film part, 224 end face, 25 connecting part, 2a through groove, 29 adhesive layer, 31 optical transparent film, 33 circularly polarizing film, 35 cover glass, 4 laminated film, 41 buffer film, 43 first heat radiation film, 45 second heat radiation Film, 47 adhesive tape, 5 protective coating, 6 spacer, 61 sandwiched portion, 62 adhesive layer, 63 main body, 631 base, 633 protruding portion, 64 adhesive layer.

Claims (10)

A display panel including a display region, a terminal region provided with terminals, and a bendable bending region located between the display region and the terminal region;
A back film that is attached to the back surface opposite to the display surface of the display panel, a first film portion that is attached to the back surface of the display area, and a second film part that is attached to the back surface of the terminal area; Including a back film,
A spacer, wherein the bent region is bent and the terminal region and the second film portion are positioned on the back side of the display region and the first film portion, and the spacer includes the first film portion and the second film portion. A spacer that is sandwiched between the film portion and contacts the back surface of the bent region;
With
An end surface facing at least one of the bent regions of the first film portion and the second film portion has a gradient so as to protrude outward as it approaches the back surface.
Display device. The end surface having the gradient contacts the back surface of the bent region,
The display device according to claim 1. The end surface having the slope has a curved surface convex toward the display panel.
The display device according to claim 1. Both the end face of the first film part and the end face of the second film part have the gradient,
The display device according to claim 1. The end face having the gradient is located outside a position where the spacer is attached to the first film part or the second film part.
The display device according to claim 1. The spacer includes a sandwiched portion sandwiched between the first film portion and the second film portion, and a projecting portion that projects outward from the sandwiched portion and contacts the back surface of the bent region.
The display device according to claim 1. Further comprising a laminated film including a plurality of films attached to the back surface of the first film portion;
The laminated film is located between the first film portion and the second film portion;
The display device according to claim 1. A protective coating covering the bent surface of the bent region;
The display device according to claim 1. Providing a display panel including a display area, a terminal area provided with terminals, and a bendable bending area located between the display area and the terminal area;
A step of attaching a back film to the back surface opposite to the display surface of the display panel, the step of attaching a first film portion to the back surface of the display region and a second film portion to the back surface of the terminal region. When,
The bent region is bent, the terminal region and the second film portion are positioned on the display region and the back side of the first film portion, and a spacer is sandwiched between the first film portion and the second film portion. And contacting with the back surface of the bent region,
With
An end surface facing at least one of the bent regions of the first film portion and the second film portion has a gradient so as to protrude outward as it approaches the back surface.
Manufacturing method of display device. The back film connects the first film portion and the second film portion at both ends of the through groove, the through groove facing the end surface of the first film portion and the end surface of the second film portion. A connecting portion;
A step of cutting off the connecting portion from the back film after the spacer is sandwiched between the first film portion and the second film portion;
A method for manufacturing the display device according to claim 9.

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