Foam rubber for increasing folding times of flexible OLED display module

Abstract

The utility model discloses foam rubber for increasing the folding frequency of a flexible OLED display module, and belongs to the technical field of OLED display. Comprising a foam rubber layer and an OLED module layer, the foam rubber layer comprises a first adhesive layer attached to the OLED module layer, a foam layer arranged on the side, away from the OLED module layer, of the first adhesive layer, and a second adhesive layer arranged on the side, away from the first adhesive layer, of the foam layer; the first adhesive layer is composed of a plurality of same and parallel strip-shaped protrusions, and the cross section of each strip-shaped protrusion is in a trapezoid shape. According to the utility model, the first adhesive layer is limited to be a plurality of mutually parallel strip-shaped bulges, so that the contact area after the foam adhesive layer and the OLED module layer are attached can be reduced, and the problems of indentation and wrinkles on the surface of foam adhesive caused by multiple folding times in the folding test process of the OLED module layer and the foam adhesive layer are reduced; meanwhile, the structure of the first adhesive layer is limited, a hollow layer can be reserved at the attaching position of the foam rubber layer and the OLED module layer, and air exhausting and foam discharging are faster.

Description

TECHNICAL FIELD

[0001] The utility model belongs to OLED display technical field, especially relate to a kind of flexible OLED display module folding times of improving foam rubber. BACKGROUND

[0002] At present, OLED flexible display panel as the display component of electronic equipment has been widely applied in various electronic products, flexible folding display module has the advantages such as foldable, curlable, smaller volume can realize large size, and it is convenient to store and carry and is popular in the market;Flexible folding display module needs to pass through hundreds of thousands of times of folding test, the overall structure design and film layer material performance requirement of module are extremely high, otherwise folding area will occur delamination and other phenomena due to multiple folding when folding area carries out dynamic folding test, thereby leading to the trace or extrusion sign of folding module, leading to that the yield of folding flexible module production is low, and cost is also high.

[0003] Due to the continuous development of flexible OLED technology, brand customers have successively produced foldable OLED mobile phones. The existing mass production products, whether in the form of inner folding or outer folding, the folding radius (R) is generally small, and is in the state of folding, in the folding process, after multiple folding, folding times are greater than or equal to 200K, and the existing stacking design usually causes extrusion marks or extrusion and falling phenomenon between OLED module and foam rubber, thereby affecting the display and folding performance of module.

[0004] The existing bonding condition between foam rubber and OLED module is as shown in the structure Figure 1 : wherein the foam rubber layer and the OLED module layer are bonded, the foam rubber layer includes adhesive layer, foam layer and adhesive layer. At present, the foam structure is basically flat and bonded with the OLED module layer, but after multiple folding, the OLED module will be extruded to produce marks or falling. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of foam rubber of improving flexible OLED display module folding times, to increase the pressure resistance of folding process and the recoverable performance of material when pressure disappears, reduce the indentation and wrinkle problem in folding process.

[0006] The utility model aims at realizing the following technical scheme:

[0007] The utility model provides a kind of to improve the folding times of flexible OLED display module foam glue, including the foam glue layer that is consistent with OLED module layer, wherein the foam glue layer includes the first adhesive layer that is consistent with the OLED module layer, the foam layer is arranged on the side of the first adhesive layer away from the OLED module layer, and the second adhesive layer is arranged on the side of the foam layer away from the first adhesive layer.

[0008] The first adhesive layer is composed of a plurality of identical and mutually parallel strip-shaped protrusions, and the cross section of the strip-shaped protrusions is trapezoidal.

[0009] Preferably, the foam layer is polyurethane foam or polyacrylate foam.

[0010] Preferably, the foam layer is selected from any one of Rogers foam, 3M foam, Jushui Chemical foam and Dongguan OmiKo foam.

[0011] Preferably, the density of the foam layer is 20-400 kg / m3, and the thickness of the foam layer is 10-100 microns.

[0012] Preferably, the compression permanent set of the foam layer is 0-10%, and the tensile strength is 1000-3000 MPa.

[0013] Preferably, the adhesive force of the first adhesive layer and the second adhesive layer is greater than 25 N.

[0014] Preferably, the first adhesive layer or the second adhesive layer is selected from acrylic adhesive.

[0015] Preferably, the included angle between adjacent strip-shaped protrusions is 30-60°.

[0016] Preferably, the distance between the top surface of the strip-shaped protrusion and the ground is 10-30 microns.

[0017] Preferably, the second adhesive layer is composed of a plurality of identical and mutually parallel strip-shaped protrusions.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model limits the adhesive layer structure of the first adhesive layer, and a plurality of mutually parallel strip-shaped protrusions are arranged at the position where the OLED module layer and the foam glue layer are consistent, which can reduce the contact area after the foam glue layer and the OLED module layer are consistent, thereby reducing the indentation and wrinkles on the surface of the foam glue caused by the large number of folding times in the folding test process. Whether folding forward or folding backward, the indentation and wrinkles are reduced. Meanwhile, the first adhesive layer is limited to a plurality of mutually parallel strip-shaped protrusion structures, which can leave a hollow layer in the middle after the foam glue layer and the OLED module layer are consistent, and the exhaust and bubble removal are faster.

[0020] In the OLED module manufacturing process, the flexible OLED needs to be folded and curled continuously, and the OLED module layer and the foam adhesive layer are subjected to pressure during folding and curling. The structural design in the utility model can increase the pressure resistance during folding and the recoverability of the material when the pressure disappears, and reduce the indentation and wrinkle problems during folding. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural diagram of the foam adhesive layer and the OLED module layer in the prior art.

[0022] Figure 2 is a folding structure diagram of the foam adhesive layer and the OLED module layer in the prior art.

[0023] Figure 3 is a structural diagram of the foam adhesive layer and the OLED module layer in Example 1.

[0024] Figure 4 is Figure 3 is a structural diagram of the foam adhesive layer and the OLED module layer after the second adhesive layer is designed as a strip-shaped protrusion.

[0025] In the figure: 1-OLED module layer, 2-first adhesive layer, 3-foam layer, 4-second adhesive layer. DETAILED DESCRIPTION

[0026] Example 1

[0027] The bonding condition between the foam adhesive and the OLED module in the prior art is shown in the structure Figure 1 , wherein the foam adhesive layer and the OLED module layer 1 are bonded, the foam adhesive layer includes a first adhesive layer 2, a foam layer 3, and a second adhesive layer 4. At present, the foam structure is basically flat and bonded with the OLED module layer 1, but after being folded for many times (as shown in Figure 2 left or Figure 2 right), the OLED module will be pressed to produce marks or fall off, etc.

[0028] Based on this, the utility model provides a kind of foam adhesive for improving the folding times of flexible OLED display module, as shown in Figures 3-4 , including the foam adhesive layer that is bonded with OLED module layer 1, wherein, as shown in Figures 3-4 , the foam adhesive layer includes the first adhesive layer 2 that is bonded with the OLED module layer 1, the foam layer 3 that is arranged on the side of the first adhesive layer 2 away from the OLED module layer 1, and the second adhesive layer 4 that is arranged on the side of the foam layer 3 away from the first adhesive layer 2.

[0029] As shown in Figures 3-4As shown, the first adhesive layer 2 is composed of a plurality of identical and mutually parallel strip-shaped protrusions, and the cross section of the strip-shaped protrusion is trapezoidal (i.e. the face vertically cut along the width direction of the strip-shaped protrusion).

[0030] Working principle: the utility model discloses a first adhesive layer 2's adhesive layer structure is limited, sets up a plurality of mutually parallel strip-shaped protrusions in the position of sticking with OLED module layer 1 and foam adhesive layer, can reduce the contact area of foam adhesive layer and OLED module layer 1 after sticking, thereby reducing the indentation and wrinkle problem of foam adhesive surface caused by folding many times in the folding test process of OLED module layer 1 and foam adhesive layer, whether it is positive folding or reverse folding, will reduce indentation and wrinkle, simultaneously, the first adhesive layer 2 is limited to a plurality of mutually parallel strip-shaped protrusion structure, can leave hollow layer in the position of sticking foam adhesive layer and OLED module layer 1, and exhaust and bubble are faster.

[0031] In the process of OLED module process, because flexible OLED needs to be folded and curled constantly, OLED module layer 1 and foam adhesive layer are pressed when folding and curling, the structure design in the utility model can increase the pressure resistance in the folding process and the recoverability of material when the pressure disappears, and reduce the indentation and wrinkle problem in the folding process.

[0032] Embodiment 2

[0033] On the basis of embodiment 1, the foam layer 3 is polyurethane foam or polyacrylate foam. Further, the foam layer 3 selects any one of Rogers foam, 3M foam, chemical foam, Dongguan Omi foam. Further, the density of the foam layer 3 is 20-400 kg / m3, which can be closed-cell or open-cell foam, and the thickness of the foam layer 3 is 10-100 microns. Further, the compression permanent set of the foam layer 3 is 0-10%, and the tensile strength is 1000-3000 MPa. Further, the adhesion of the first adhesive layer 2 and the second adhesive layer 4 is greater than 25N. The adhesion of the first adhesive layer 2 is greater than 25N, and the adhesion is large, and the plurality of mutually parallel strip-shaped protrusions can make the foam adhesive layer stick more smoothly. Further, the first adhesive layer 2 or the second adhesive layer 4 selects acrylic adhesive. Further, the included angle between adjacent strip-shaped protrusions is 30-60°, so as to ensure better sticking when folding, and not too large or too small extrusion. Further, the distance between the top surface of the strip-shaped protrusion and the ground is 10-30 microns, so as to play a certain bonding role while also playing a role. Further, as shown in the figure, the second adhesive layer 4 is composed of a plurality of identical and mutually parallel strip-shaped protrusions. Figure 4 As shown, the second adhesive layer 4 is composed of a plurality of identical and mutually parallel strip-shaped protrusions.

Claims

1. A flexible OLED display module folding number improving foam glue, characterized in that, The OLED module layer (1) is attached to a foam adhesive layer, wherein the foam adhesive layer comprises a first adhesive layer (2) attached to the OLED module layer (1), a foam layer (3) disposed on a side of the first adhesive layer (2) away from the OLED module layer (1), and a second adhesive layer (4) disposed on a side of the foam layer (3) away from the first adhesive layer (2). The first adhesive layer (2) is composed of a plurality of identical and parallel strip-shaped protrusions, and the cross section of the strip-shaped protrusions is trapezoidal. 2.The foam glue for improving the folding times of a flexible OLED display module according to claim 1, characterized in that, The foam layer (3) is polyurethane foam or polyacrylate foam. 3.The foam glue for improving the folding times of a flexible OLED display module according to claim 1, characterized in that, The foam layer (3) is selected from any one of Rogers foam, 3M foam, Jushui Chemical foam, and Dongguan Omic foam. 4.The foam glue for improving the folding times of a flexible OLED display module according to claim 1, characterized in that, The density of the foam layer (3) is 20-400 kg / m 3 The thickness of the foam layer (3) is 10-100 microns. 5.The foam glue for improving the folding times of a flexible OLED display module according to claim 1, characterized in that, The foam layer (3) has a compression permanent set of 0-10% and a tensile strength of 1000-3000 MPa. 6.The foam glue for improving the folding times of a flexible OLED display module according to claim 1, characterized in that, The bonding force of the first adhesive layer (2) and the second adhesive layer (4) is greater than 25 N. 7.The foam glue for increasing the folding times of a flexible OLED display module according to claim 1, characterized in that, The first adhesive layer (2) or the second adhesive layer (4) is selected from an acrylic adhesive. 8.The foam glue for increasing the folding times of a flexible OLED display module according to claim 1, wherein, The included angle between adjacent strip-shaped protrusions is 30-60°. 9.The foam glue for increasing the folding times of a flexible OLED display module according to claim 1, characterized in that, The distance between the top surface and the bottom surface of the strip-shaped protrusion is 10-30 microns. 10.The foam glue for increasing the folding times of a flexible OLED display module according to claim 1, wherein, The second adhesive layer (4) is composed of a plurality of identical and parallel strip-shaped protrusions.

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