JP2019053199A - Sheet type display device and method for fixing sheet type display device - Google Patents

Abstract

To provide a sheet type display device that can be favorably fixed to a curved face and stably maintains the fixed state for a long period of time.SOLUTION: A sheet type display device having flexibility includes a flexible holding substrate and a display layer formed on the holding substrate, in which a plurality of slits having a depth direction along a thickness of the holding member is disposed in the whole exposed surface of the holding member.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a flexible sheet-like display, and more particularly to its form.

  Conventionally, in organic EL displays and liquid crystal displays generally called thin displays, a brittle material substrate such as a glass substrate has been used as a holding substrate (underlying substrate) for holding a display layer.

  On the other hand, in recent years, a sheet-like plastic substrate (resin substrate) that is thinner than a brittle material substrate and has flexibility is used as a base material, so that it is further thinner than conventional thin displays as a whole. A sheet-like display (sheet display, flexible display) having flexibility is widely known and put into practical use (see, for example, Patent Document 1).

JP 2003-280548 A

  In general, a sheet display is used after being fixed to a sufficiently hard support by bonding, screwing, clamping, or the like so as not to be bent and damaged by an external force. The size varies depending on the usage, for example, from a few inches like a smartphone or a tablet-like personal digital assistant to a few tens of inches like a digital signage, but depending on the size A support is provided. Alternatively, it may be fixed while being curved with respect to the fixed surface of the support having a curved surface by utilizing its flexibility.

  For example, for use as digital signage in public facilities and commercial facilities, large-sized sheet displays with a size of more than several tens of inches are placed on columnar pillars with a diameter of about 1 m to several meters. There is. In such a case, the surface of the column having a curved surface itself is the support, or a support member provided along the surface is the support. In either case, the support having the curved surface is used. The sheet display curved along the surface is fixed directly to the surface of the body.

  However, when trying to arrange the sheet display in such a manner, there are cases where the sheet display is bent too much to cause a defect.

  Moreover, although it has flexibility, when curving a sheet display, there is a limit corresponding to the curvature of the support.

  Furthermore, even if it can be suitably curved and fixed to the surface of the support, stress is generated in the interior of the sheet display due to the curvature, and distortion is inherent. There is also a possibility that peeling or floating may occur at the bonded portion, or peeling may occur inside the sheet display.

  The present invention has been made in view of the above problems, and provides a sheet-like display device that can be suitably fixed to a curved surface and can be stably maintained for a long period of time. The purpose is to do.

  In order to solve the above-mentioned problems, the invention of claim 1 is a sheet-like display having flexibility, comprising a holding substrate having flexibility and a display layer formed on the holding substrate. The device is characterized in that a plurality of slits having a thickness direction of the holding member as a depth direction are provided over the entire exposed surface of the holding member.

  According to a second aspect of the present invention, there is provided a flexible holding substrate and a display layer formed on the holding substrate, wherein the flexible sheet-like display device is a predetermined support. A plurality of slits having a thickness direction of the holding member as a depth direction over the entire exposed surface of the holding member, and fixed to a predetermined support. Adhering the exposed surface of the holding substrate and the surface of the support while following the exposed surface of the holding substrate to the surface of the support and maintaining the open state of the plurality of slits It is characterized by.

  According to the first and second aspects of the present invention, even when the display device is continuously used, peeling or floating occurs in the bonded portion between the display device and the support due to the presence of distortion, or the display device The occurrence of peeling inside is suitably suppressed. In addition, heat generated in the sheet display is generated to the outside through the slit.

It is a figure which shows a mode that the sheet | seat display 10 provided with the display layer 2 on the holding base material 1 is fixed with respect to the support body 3. FIG. It is a figure which shows the state after fixing the sheet | seat display 10 to the support body 3 as it is. It is a figure for demonstrating the structure of the sheet | seat display 10 employ | adopted in this Embodiment. It is a figure which shows a mode that the sheet | seat display 10 of this Embodiment is fixed to the support body 3. FIG. It is a figure which shows the state after fixing the sheet | seat display 10 which concerns on this Embodiment to the support body 3. FIG. It is a figure which illustrates the slit S from which the side surface became curved shape.

  FIG. 1 is a view showing a state in which a sheet display 10 having a display layer 2 on a holding substrate 1 is fixed to a support 3.

  The sheet display 10 is generally a kind of display device (display device), and has a configuration in which a display layer 2 responsible for displaying an image or the like is laminated on a flexible holding substrate 1 as a whole. It has flexibility. The sheet display 10 is, for example, an organic EL display or a liquid crystal display.

  The holding substrate 1 is exemplified by a PET film having a thickness of about 30 μm to 200 μm. However, the material and thickness of the holding substrate 1 are not particularly limited as long as they have flexibility and can suitably hold the display layer 2. It is not limited.

  The specific configuration of the display layer 2 varies depending on the type (display principle) of the sheet display 10. When the sheet display 10 is an organic EL display, for example, various layers responsible for organic EL light emission such as a light emitting layer, a hole transport layer, an electron transport layer, and an electrode (anode, cathode) form the display layer 2 as a whole. Configure. Furthermore, a protective layer for protecting these layers may be included. On the other hand, when the sheet display 10 is a liquid crystal display, various layers responsible for liquid crystal light emission such as a liquid crystal layer, an alignment film, a light guide layer, a polarizing layer, and an electrode constitute the display layer 2 as a whole. Furthermore, a protective layer for protecting these layers may be included.

  In any case, the display layer 2 is provided so as to be suitably deformable following the deformation of the holding substrate 1 having flexibility. Thereby, the sheet display 10 has flexibility as a whole.

  More specifically, on the edge portion (not shown) of the sheet display 10, there are provided terminal elements for electrical connection with the outside and other circuit element portions including various circuit elements that do not directly contribute to the display. 1 (in place of the constituent elements of the display layer 2).

  In FIG. 1, the sheet display 10 having the above configuration is configured such that the exposed surface 1 a (the surface on which the display layer 2 is not formed) of the holding substrate 1, which is the back surface, is indicated by an arrow AR 1. The state of fixing to the support 3 by bonding with an adhesive (not shown) to the surface 3a curved in the uniaxial direction of the support 3 is shown. As long as the sheet display 10 can be stably supported, the material of the support 3 is not particularly limited, and an appropriate member may be selected according to the type of the sheet display 10 and the intended use.

  FIG. 2 is a diagram illustrating a state after the sheet display 10 having the above-described configuration is fixed to the support 3 according to the mode illustrated in FIG. 1 as it is for comparison.

  In order to realize the bonding shown in FIG. 1, it is necessary to bond the sheet display 10 to the surface 3a after being curved according to the shape of the surface 3a. Of course, the sheet display 10 must not be damaged during such bending.

  However, in the case shown in FIG. 2, even if the sheet display 10 is suitably curved and the exposed surface 1a of the holding substrate 1 is adhered to the surface 3a of the support 3, the inside of the sheet display 10 having such a curved shape is formed. (More specifically, in the holding base material 1 on the side closer to the support 3), the compressive stress f1 is generated, and the compression strain is inherent. With the generation of the compressive stress f1 and compressive strain, a tensile stress f2 is generated outside the sheet display 10 (more specifically, the display layer 2 and the holding substrate 1 in the vicinity thereof), and the tensile strain is inherent. It is in a state.

  Therefore, if the use is continued, there is a possibility that peeling or floating may occur at the bonded portion between the sheet display 10 and the support, or peeling may occur inside the sheet display 10 due to the presence of such distortion. is there.

  FIG. 3 is a view for explaining the structure of the sheet display 10 employed in the present embodiment. FIG. 4 is a diagram showing a state in which the sheet display 10 having such a form is fixed to the support 3 in the manner shown in FIG. And FIG. 5 is a figure which shows the state after actually fixing the sheet | seat display 10 which concerns on this Embodiment to the support body 3 by the aspect shown in FIG.

  In the present embodiment, as illustrated in the enlarged view of the portion A in FIG. 3, in the thickness direction from the exposed surface 1 a side over the entire exposed surface 1 a of the holding substrate 1 constituting the sheet display 10. A large number of slits S having a depth and extending parallel to each other are provided. FIG. 3 shows a cross section perpendicular to the longitudinal direction of the slit S. Formation of the slit S can be realized in various modes such as laser beam irradiation (laser scribing), mechanical processing, chemical processing, and the like.

  When the sheet display 10 having the slits S is fixed to the support 3 in the manner indicated by the arrow AR2 in FIG. 4, the sheet display 10 is formed in the shape of the surface 3a as in the case shown in FIG. It is made to adhere and adhere to the surface 3a after being curved.

  In that case, of course, the sheet display 10 is bent so that the breakage does not occur. In addition, the depth d and the pitch p of the slit S in the state before bonding (before bending) are added. When the (maximum) opening width w, the number, etc. are appropriately determined in consideration of the size of the sheet display 10 and the size (for example, thickness) of the support 3, as shown in FIG. The slit S is kept open while its width is narrowed.

  In this case, unlike the case of FIG. 2, the exposed surface 1 a of the holding substrate 1 is discontinuous due to the presence of the slits S, and therefore the inner side of the sheet display 10 (more specifically, the holding substrate 1 Compressive stress does not occur on the side close to the support 3), and therefore the holding substrate 1 does not have compressive strain. Since no compressive stress and compressive strain are generated on the inner side as described above, the generation of tensile stress and the tensile strain are also generated on the outer side of the sheet display 10 (more specifically, the display layer 2 and the holding substrate 1 in the vicinity thereof). Is inherently suppressed.

  As a result, in the case of the sheet display 10 according to the present embodiment, even when the sheet display 10 is used continuously, peeling or floating occurs in the bonded portion between the sheet display and the support due to the presence of distortion, or the sheet display It is possible to obtain an effect of suitably suppressing the occurrence of peeling inside.

  In addition, since the individual slits S are present, the heat generated in the sheet display 10 is also radiated to the outside through the slits S.

<Modification>
In the above-described embodiment, the case where the slit S provided in the holding base material 1 has a triangular shape in cross section is shown, but this is merely an example. FIG. 6 is a diagram illustrating a slit S having a curved side surface.

  Further, the extending direction of the slit S is not limited to one direction, and the slit S may be provided in different directions such as two orthogonal directions. In such a case, the sheet display can be suitably fixed also to the surface of the support curved in the biaxial direction.

DESCRIPTION OF SYMBOLS 1 Holding base material 1a Exposed surface (of holding base material) 2 Display layer 3 Support body 3a (Support body) surface 10 Sheet display S Slit

Claims (2)

A holding substrate having flexibility;
A display layer formed on the holding substrate;
Comprising a flexible sheet-like display device,
A plurality of slits having a thickness direction of the holding member as a depth direction are provided over the entire exposed surface of the holding member.
A sheet-like display device characterized by the above. A holding substrate having flexibility;
A display layer formed on the holding substrate;
Comprising a flexible sheet-like display device fixed to a predetermined support,
A plurality of slits having a thickness direction of the holding member as a depth direction are provided over the entire exposed surface of the holding member in advance.
When fixing to a predetermined support, the exposed surface of the holding substrate is made to follow the surface of the supporting substrate while maintaining the open state of the plurality of slits. And the surface of the support are bonded,
A method for fixing a sheet-like display device.

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