Composite material supporting structure and flexible display device

Abstract

A composite material supporting structure applied to a flexible display device comprises a first material layer, two second material layers and two third material layers. The first material layer is composed of first fiber bundles. The fiber direction of the first fiber bundle is a first direction. The two second material layers are located on the two sides of the first material layer respectively. The second material layer is composed of second fiber bundles. The fiber direction of the second fiber bundle is a second direction. The second direction is perpendicular to the first direction. The two third material layers are located on the two second material layers respectively. The third material layer has a first region material layer and a second region material layer. The composite material supporting structure meets the requirement that a is larger than or equal to pir and smaller than or equal to 2pir in the bent state. R is the bending radius of the composite material supporting structure in the bending state. A is the distance between the first area material layer and the second area material layer when the composite material supporting structure is in a non-bending state.

Description

Technical Field

[0001] The utility model relates to a composite material support structure, a manufacturing method of the composite material support structure and a flexible display device. Background Art

[0002] Since the beginning of 2019, the industry has released a series of rollable TVs and bendable mobile phone products, mainly due to the advancement of flexible display or flexible display production technology, which allows the display of panels in addition to flat, arc, ring or curled effects, giving users different experiences. However, for flexible displays to be bendable, the reliability and deformation strength of repeated bending and folding are relatively important. Because a smaller radius of curvature is required, a plastic substrate (such as CPI (polyimide) or other materials with higher heat resistance) must be used to replace the glass substrate to achieve the bendable characteristics. The bendable plastic substrate is also very light, soft and thin, and is easily damaged by external forces, resulting in display anomalies and other defects. In the development of flexible displays, the support structure (Support Structure Units) of the display was not taken into account. This new type of composite material laminate design and production technology can be produced to bend synchronously with the display, and the laminate can be flatly attached to the non-display surface and serve as its support structure, which can bend synchronously with the flexible display and mechanism (Bend or Fold). Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the utility model provides a composite material support structure.

[0004] According to one aspect of the utility model, the technical solution is to provide a composite material support structure including a first material layer, two second material layers and two third material layers. The first material layer is composed of a plurality of first fiber bundles. The fiber direction of the first fiber bundle is a first direction. The two second material layers are respectively located on two opposite sides of the first material layer away from the first material layer. The second material layer is composed of a plurality of second fiber bundles. The fiber direction of the second fiber bundle is a second direction. The second direction is perpendicular to the first direction. The two third material layers are respectively located on the two second material layers. The third material layer has a first area material layer and a second area material layer. The composite material support structure meets πr≤a≤2πr in a bent state. r is the bending radius of the composite material support structure in a bent state. a is the distance between the first area material layer and the second area material layer of the composite material support structure in a non-bent state.

[0005] In one embodiment of the present invention, the first region material layer and the second region material layer of the third material layer are separated by a gap.

[0006] In one embodiment of the present invention, the first region material layer of the third material layer is composed of a plurality of third fiber bundles, and the fiber direction of the third fiber bundle is parallel to the first direction.

[0007] In one embodiment of the present invention, the second region material layer of the third material layer is composed of a plurality of fourth fiber bundles, and the fiber direction of the fourth fiber bundles is parallel to the first direction.

[0008] In one embodiment of the present invention, the composite material support structure further comprises a bending layer, which is located between the first area material layer and the second area material layer of the third material layer.

[0009] In one embodiment of the present invention, the bending layer is located on the second material layer.

[0010] In one embodiment of the present invention, the bending layer is composed of a plurality of fifth fiber bundles, and the fiber direction of the fifth fiber bundle is different from the first direction.

[0011] In one embodiment of the present invention, the fiber direction of the fifth fiber bundle of the bending layer is parallel to the second direction.

[0012] In one embodiment of the present invention, the materials of the first material layer, the second material layer, the third material layer and the bending layer include polymer materials.

[0013] In one embodiment of the present invention, the composite material support structure meets 0.01r≤h≤0.1r in a bent state, where h is the single layer thickness of the first material layer, the second material layer or the third material layer.

[0014] Another aspect of the present invention is to provide a flexible display device.

[0015] According to an embodiment of the present invention, a flexible display device comprises the composite material support structure and a display panel. The display panel is disposed on the composite material support structure.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] In the above-mentioned embodiment of the utility model, the second material layer of the composite material support structure is stacked on the first material layer, and the third material layer is stacked on the second material layer. The stacked material layers can provide sufficient rigidity and strength to improve the fatigue resistance, flexibility, easy bending and reduced bending radius of the composite material support structure when bending. In addition, the first material layer of the composite material support structure is located between the two second material layers, and the fiber direction of the first fiber bundle is perpendicular to the fiber direction of the second fiber bundle. The symmetrically designed fiber bundles make the composite material support structure have the advantages of flat structure and not easy to warp. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a top view of a flexible display device according to one embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A cross-sectional view of the flexible display device along line segment 2-2.

[0020] Figure 3 It is a schematic diagram of a flexible display device in a bent state according to an embodiment of the present invention.

[0021] Figure 4 It is a cross-sectional view of a flexible display device according to another embodiment of the present invention.

[0022] Figure 5 It is a cross-sectional view of a flexible display device according to another embodiment of the present invention.

[0023] Figure 6 It is a flow chart of a method for manufacturing a composite material support structure according to one embodiment of the present utility model.

[0024] Figure 7 It is a cross-sectional view of manufacturing a composite material support structure according to one embodiment of the utility model.

[0025] Figure 8 It is a cross-sectional view of manufacturing a composite material support structure according to another embodiment of the utility model.

[0026] Fig. 9 It is a cross-sectional view of manufacturing a composite material support structure according to another embodiment of the utility model.

[0027] Fig.10 and Fig.11 It is a cross-sectional view at different stages of a method for manufacturing a composite material support structure according to one embodiment of the present invention.

[0028] Description of the figure number:

[0029] 100,100a,100b: Composite material support structure

[0030] 110: First material layer

[0031] 120: Add the second material layer

[0032] 130: Lower second material layer

[0033] 140: Upper third material layer

[0034] 142: Upper first zone material layer

[0035] 144: Upper second zone material layer

[0036] 150: Lower third material layer

[0037] 152: Lower first zone material layer

[0038] 154: Lower second zone material layer

[0039] 160,160a: Upper bending layer

[0040] 170,170a: Lower bending layer

[0041] 200, 200a, 200b: Flexible display device

[0042] 210: Display Panel

[0043] 2-2: Line segment

[0044] C1: Lower convex part

[0045] F1: First fiber bundle

[0046] F2: Second fiber bundle

[0047] F3: The third fiber bundle

[0048] F4: The fourth fiber bundle

[0049] F5: Fifth fiber bundle

[0050] G: Gap

[0051] I: Vacuum membrane

[0052] M1: Lower mold

[0053] M2: Upper mold

[0054] M3: Lower mold

[0055] M4: Lower mold

[0056] M5: Upper mold

[0057] P1: Bending zone

[0058] P2: Leveling area

[0059] r: bending radius

[0060] S1: Steps

[0061] S2: Steps

[0062] T: Rubber Strip

[0063] X: First direction

[0064] Y: Second direction

[0065] Z: Third direction

[0066] θ: chamfer. DETAILED DESCRIPTION

[0067] Figure 1 It is a top view of a flexible display device 200 according to an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the flexible display device 200 along line segment 2-2. Figure 1 and Figure 2 , the flexible display device 200 includes a composite material support structure 100 and a display panel 210. The display panel 210 of the flexible display device 200 is disposed on the composite material support structure 100. The flexible display device 200 has a bending area P1 and a flat area P2. The composite material support structure 100 includes a first material layer 110, an upper second material layer 120, a lower second material layer 130, an upper third material layer 140 and a lower third material layer 150. The upper second material layer 120 and the lower second material layer 130 of the composite material support structure 100 are respectively located on two opposite sides (e.g., upper and lower sides) of the first material layer 110 away from the first material layer 110. The upper third material layer 140 of the composite material support structure 100 is located on the upper second material layer 120. The lower third material layer 150 of the composite material support structure 100 is located on the lower second material layer 130.

[0068] In some embodiments, the first material layer 110 is composed of a plurality of first fiber bundles F1, and the fiber direction of the first fiber bundles F1 is a first direction X (such as a horizontal direction). The first direction X is perpendicular to the third direction Z (such as a vertical direction). The upper second material layer 120 and the lower second material layer 130 are composed of a plurality of second fiber bundles F2, and the fiber direction of the second fiber bundles F2 is a second direction Y (such as a direction into the paper). The second direction Y is perpendicular to the first direction X. The second direction Y is perpendicular to the third direction Z. In addition, the upper third material layer 140 has an upper first zone material layer 142 and an upper second zone material layer 144, and the lower third material layer 150 has a lower first zone material layer 152 and a lower second zone material layer 154. The upper first zone material layer 142 of the upper third material layer 140 and the lower first zone material layer 152 of the lower third material layer 150 are composed of a plurality of third fiber bundles F3. The fiber direction of the third fiber bundle F3 is parallel to the first direction X. The upper second region material layer 144 of the upper third material layer 140 and the lower second region material layer 154 of the lower third material layer 150 are composed of a plurality of fourth fiber bundles F4. The fiber direction of the fourth fiber bundles F4 is parallel to the first direction.

[0069] Specifically, the upper second material layer 120 and the lower second material layer 130 of the composite material support structure 100 are stacked on the upper and lower sides of the first material layer 110, respectively, and the upper third material layer 140 is stacked on the upper second material layer 120, and the lower third material layer 150 is stacked on the lower second material layer 130. The stacked material layers can provide sufficient rigidity and strength to improve the fatigue resistance and flexibility of the bending zone P1 of the composite material support structure 100 when bending, and the advantages of easy bending and reduced bending radius. In addition, the first material layer 110 of the composite material support structure 100 is located between the upper second material layer 120 and the lower second material layer 130, and the fiber direction of the first fiber bundle F1 is perpendicular to the fiber direction of the second fiber bundle F2. The symmetrically designed fiber bundles make the composite material support structure 100 have the advantages of flat structure and not easy to warp.

[0070] Figure 3 is a schematic diagram of a flexible display device 200 in a bent state according to an embodiment of the present invention. Figure 2 and Figure 3 , the composite material support structure 100 meets 0.01r≤h≤0.1r in the bent state, where h is the single layer thickness of the first material layer 110, the upper second material layer 120, the lower second material layer 130, the upper third material layer 140 or the lower third material layer 150, and r is the bending radius of the composite material support structure 100 in the bent state. In addition, the composite material support structure 100 meets πr≤a≤2πr in the bent state, where a is the distance between the upper first area material layer 142 and the upper second area material layer 144 of the composite material support structure 100 in the non-bent state, that is, the width of the bending area P1.

[0071] In some embodiments, the composite material support structure 100 further includes an upper bending layer 160 and a lower bending layer 170. The upper bending layer 160 is located between the upper first area material layer 142 and the upper second area material layer 144 of the upper third material layer 140, and is located on the upper second material layer 120. The lower bending layer 170 is located between the lower first area material layer 152 and the lower second area material layer 154 of the lower third material layer 150, and is located on the lower second material layer 130. In addition, the first material layer 110, the upper second material layer 120, the lower second material layer 130, the upper third material layer 140, the lower third material layer 150, the upper bending layer 160, and the lower bending layer 170 of the composite material support structure 100 include polymer materials. The upper bending layer 160 and the lower bending layer 170 made of polymer materials can effectively improve the deflection and fatigue of the composite material support structure 100 in the bending area P1 when it is in a bent state.

[0072] In the following description, other types of flexible display devices will be described. Figure 4It is a cross-sectional view of a flexible display device 200a according to another embodiment of the present invention. Figure 4 The flexible display device 200a and Figure 1 The embodiment shown is different in that the upper bending layer 160a and the lower bending layer 170a are composed of a plurality of fifth fiber bundles F5. The fiber direction of the fifth fiber bundle F5 is different from the first direction X. In detail, the fiber direction of the fifth fiber bundle F5 is parallel to the second direction Y. The fifth fiber bundles F5 of the upper bending layer 160a and the lower bending layer 170a stacked up and down make the composite material support structure 100a have sufficient rigidity and strength, so as to improve the bending characteristics of the composite material support structure 100a when bending.

[0073] Figure 5 It is a cross-sectional view of a flexible display device 200b according to yet another embodiment of the present invention. Figure 5 The flexible display device 200b and Figure 1 The embodiment shown is different in that the composite material support structure 100b of the flexible display device 200b does not have Figure 1 The lower bending layer 170 is formed by the lower first area material layer 152 and the lower second area material layer 154 of the lower third material layer 150 of the composite material support structure 100b are separated by a gap G. The lower third material layer 150 of the composite material support structure 100b of the flexible display device 200b is stacked on the lower second material layer 130. The stacked material layers can provide sufficient rigidity and strength to improve the fatigue resistance and deflection of the bending area P1 of the composite material support structure 100b when it is bent.

[0074] In the following description, a method for manufacturing a composite material support structure will be described.

[0075] Figure 6 It is a flow chart of a method for manufacturing a composite material support structure according to an embodiment of the utility model. The method for manufacturing a composite material support structure includes the following steps. First, in step S1, second material layers are respectively arranged on opposite sides of a first material layer, wherein the first material layer is composed of a plurality of first fiber bundles, and the second material layer is composed of a plurality of second fiber bundles, the fiber direction of the first fiber bundle is a first direction, and the fiber direction of the second fiber bundle is a second direction, and the second direction is perpendicular to the first direction. Next, in step S2, a third material layer is arranged on the second material layer, wherein the third material layer has a first zone material layer and a second zone material layer, and the composite material support structure meets πr≤a≤1.1πr in a bent state, r is the bending radius of the composite material support structure in a bent state, a is the spacing between the first zone material layer and the second zone material layer of the composite material support structure in a non-bent state, and π is the pi. In the following description, each of the above steps will be described in detail.

[0076] Figure 7 is a cross-sectional view of a composite material support structure 100 according to an embodiment of the present invention. Figure 7 The composite material support structure 100 can be manufactured by compression molding. For example, the composite material support structure 100 is located between the lower mold M1 and the upper mold M2, and the lower mold M1 and the upper mold M2 are sealed and pressurized to apply pressure to the composite material support structure 100.

[0077] Figure 8 is a cross-sectional view of a composite material support structure 100 according to another embodiment of the present invention. Figure 8 The composite material support structure 100 can be manufactured by film forming. For example, the composite material support structure 100 is located on the lower mold M3 and between two rubber strips T, and the vacuum film I covers the composite material support structure 100.

[0078] Fig. 9 is a cross-sectional view of a composite material support structure 100b manufactured according to another embodiment of the present invention. Fig. 9 The composite material support structure 100b can be manufactured by compression molding. For example, the composite material support structure 100b is located between the lower mold M4 and the mold M5, and the lower mold M4 has a lower protrusion C1, and the composite material support structure 100b has a chamfer θ. The chamfer θ ranges from 30 degrees to 45 degrees.

[0079] Fig.10 and Fig.11 is a cross-sectional view of a method for manufacturing a composite material support structure according to an embodiment of the present invention at different stages. Fig.10 and Fig.11 First, an upper second material layer 120 and a lower second material layer 130 may be disposed on opposite sides (e.g., upper and lower sides) of the first material layer 110, respectively. The first material layer 110 is composed of a plurality of first fiber bundles F1. The upper second material layer 120 and the lower second material layer 130 are composed of a plurality of second fiber bundles F2. The fiber direction of the first fiber bundle F1 is the first direction X, and the fiber direction of the second fiber bundle F2 is the second direction Y, and the second direction Y is perpendicular to the first direction X. The second direction Y is perpendicular to the third direction Z. Next, an upper third material layer 140 may be disposed on the upper second material layer 120, and a lower third material layer 150 may be disposed on the lower second material layer 130. The upper first zone material layer 142 of the upper third material layer 140 is separated from the upper second zone material layer 144, and the lower first zone material layer 152 of the lower third material layer 150 is separated from the lower second zone material layer 154. The upper and lower stacked material layers may provide sufficient rigidity and strength to improve fatigue resistance and deflection during bending.

[0080] Back to Figure 2 After the upper third material layer 140 is disposed on the upper second material layer 120 and the lower third material layer 150 is disposed on the lower second material layer 130, an upper bending layer 160 may be disposed between the upper first zone material layer 142 and the upper second zone material layer 144 of the upper third material layer 140, and a lower bending layer 170 may be disposed between the lower first zone material layer 152 and the lower second zone material layer 154 of the lower third material layer 150. The upper bending layer 160 is located on the upper second material layer 120. The lower bending layer 170 is located on the lower second material layer 130. The third fiber bundle F3 constitutes the upper first zone material layer 142 of the upper third material layer 140. The fourth fiber bundle F4 constitutes the upper second zone material layer 144 of the upper third material layer 140, and the fiber directions of the third fiber bundle F3 and the fourth fiber bundle F4 are parallel to the first direction X.

[0081] In addition, after the upper bending layer 160 and the lower bending layer 170 are disposed, the display panel 210 can be disposed on the composite material support structure 100 to form a display panel 210. Figure 2 The flexible display device 200 shown in FIG. The upper second material layer 120 and the lower second material layer 130 of the composite material support structure 100 of the flexible display device 200 are stacked on the upper and lower sides of the first material layer 110, respectively. The upper third material layer 140 is stacked on the upper second material layer 120. The lower third material layer 150 is stacked on the lower second material layer 130. The stacked material layers can provide sufficient rigidity and strength to improve the fatigue resistance and deflection of the bending area P1 of the composite material support structure 100 when it is bent.

Claims

1. A composite material support structure, characterized in that: Include: A first material layer, composed of a plurality of first fiber bundles, wherein the fiber directions of the first fiber bundles are in a first direction; Two second material layers, respectively located on opposite sides of the first material layer away from the first material layer, and composed of a plurality of second fiber bundles, wherein the fiber direction of the second fiber bundles is a second direction, and the second direction is perpendicular to the first direction; and Two third material layers are respectively located on the two second material layers, wherein one of the two third material layers has a first area material layer and a second area material layer, and the composite material support structure meets πr≤a≤2πr in a bent state, r is the bending radius of the composite material support structure in the bent state, a is the distance between the first area material layer and the second area material layer of the composite material support structure in a non-bent state, and π is the pi.

2. The composite material support structure according to claim 1, characterized in that: The first region material layer and the second region material layer of one of the two third material layers are separated by a gap.

3. The composite material support structure according to claim 1, characterized in that: The first region material layer of one of the two third material layers is composed of a plurality of third fiber bundles, and the fiber directions of the third fiber bundles are parallel to the first direction.

4. The composite material support structure according to claim 1, characterized in that: The second region material layer of one of the two third material layers is composed of a plurality of fourth fiber bundles, and fiber directions of the fourth fiber bundles are parallel to the first direction.

5. The composite material support structure according to claim 1, characterized in that: Also includes: A bending layer is located between the first region material layer and the second region material layer of one of the two third material layers.

6. The composite material support structure according to claim 5, characterized in that: The bending layer is located on one of the two second material layers.

7. The composite material support structure according to claim 5, characterized in that: The bending layer is composed of a plurality of fifth fiber bundles, and the fiber directions of the fifth fiber bundles are different from the first direction.

8. The composite material support structure according to claim 7, characterized in that: The fiber directions of the fifth fiber bundles of the bending layer are parallel to the second direction.

9. The composite material support structure according to claim 5, characterized in that: The materials of the first material layer, the two second material layers, the two third material layers and the bending layer include polymer materials.

10. The composite material support structure according to claim 1, characterized in that: The composite material support structure meets 0.01r≤h≤0.1r in a bent state, wherein h is the single layer thickness of the first material layer, one of the two second material layers, or one of the two third material layers.

11. A flexible display device, characterized in that: Include: A composite material support structure as claimed in any one of claims 1 to 10; and A display panel is arranged on the composite material supporting structure.

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