Flexible supporting layer for scroll type display device, flexible supporting layer assembly and scroll type display device

Abstract

The utility model discloses a flexible supporting layer for a scroll type display device, a flexible supporting layer assembly and the scroll type display device. The flexible supporting layer comprises a first hollowed-out pattern and a second hollowed-out pattern. The first hollowed-out patterns are oval patterns arranged at intervals in an array mode, the long axis direction and the short axis direction of the oval patterns in a first arrangement row and a second arrangement row which are arranged alternately are consistent with the row direction, and the oval patterns are arranged in an up-down staggered mode. The second hollowed-out patterns are cross-shaped patterns arranged in array intervals of the oval patterns, the center of each cross-shaped pattern is located between two adjacent oval patterns in the first arrangement row, and the cross-shaped patterns extend to four interval areas between the two adjacent oval patterns and the up-down oval patterns. Through the combination of the two hollow-out patterns, the flexible supporting layer can keep uniform tension in the unfolding and curling process so as to reduce the generation of folding traces, achieve a large-amplitude stretching function and provide better support for the scroll type display device.

Description

Technical Field

[0001] The utility model belongs to the technical field of displays, and particularly relates to a flexible support layer, a flexible support layer assembly and a rollable display device for a rollable display device. Background Art

[0002] A rollable screen is a new type of display technology that can provide an experience of magnifying and reducing the display screen by unfolding and rolling, freely changing the size, making the display screen more flexible and portable, and bringing a better visual experience to users. Rollable mobile phones, etc. are application forms of rollable screens.

[0003] In addition to being able to perform flexible deformation, the rollable screen also needs to have a certain degree of support and resilience to ensure the use experience and touch texture during use. Therefore, a flexible support layer is required. During the long-term process of unfolding and rolling, the support layer is prone to problems such as folding marks and poor deformation recovery due to stress, and delamination is likely to occur after long-term stretching, which will cause the screen to deform or even break, restricting the use stability and service life of the product. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the utility model provides a flexible support layer, a flexible support layer assembly and a rollable display device for a rollable display device.

[0005] In order to achieve the above purposes, the technical solution of the utility model is as follows:

[0006] A flexible support layer for a rollable display device, which includes a first hollow pattern and a second hollow pattern; the first hollow pattern is an array of elliptical patterns arranged at intervals, including alternating first arrangement rows and second arrangement rows. In the first arrangement row, the major axis direction of the elliptical pattern is consistent with the row direction, and in the second arrangement row, the minor axis direction of the elliptical pattern is consistent with the row direction, and they are arranged in a staggered manner between the upper and lower rows; the second hollow pattern is a cross-shaped pattern arranged in the array intervals of the elliptical patterns; the center of each cross-shaped pattern is located between two adjacent elliptical patterns in the first arrangement row and extends to the four interval areas between the two adjacent elliptical patterns and the elliptical patterns in the upper and lower rows.

[0007] Optionally, the minor axis length L2 of the elliptical pattern is 50% - 65% of the major axis length L1.

[0008] Optionally, in the first arrangement row, the distance L3 between adjacent elliptical patterns is 60% - 70% of the major axis length L1 of the elliptical pattern.

[0009] Optionally, the line segment of the cross-shaped pattern facing the adjacent elliptical pattern is a first arc segment parallel to the elliptical pattern.

[0010] Optionally, the distance L4 between the first arc segment and the elliptical pattern is 15% to 25% of the distance L3 between adjacent elliptical patterns.

[0011] Optionally, the cross-shaped pattern extends into the four spaced regions to form extensions, and the extensions adjacent to the four cross-shaped patterns converge between two adjacent elliptical patterns in the second arrangement row and are not connected to each other.

[0012] Optionally, the end of the extension is closed by a second arc segment, and the width of the end of the extension is greater than the width of the middle part.

[0013] Optionally, the material of the flexible support layer is PET, PU or CPI, and the thickness is 0.05 to 0.09 mm.

[0014] A flexible support layer assembly for a rollable display device, which includes a protective layer, a flexible support layer, an adhesive layer and a release layer stacked in sequence, wherein the flexible support layer is the flexible support layer described above.

[0015] A rollable display device, which includes a display function layer and the flexible support layer for the rollable display device, the flexible support layer is bonded to one side of the display function layer through an adhesive layer, wherein the row direction is consistent with the unfolding direction of the rollable display device.

[0016] The beneficial effects of the present utility model are as follows:

[0017] By adopting the combination of the first hollow pattern and the second hollow pattern, the flexible support layer can maintain uniform tension during the unfolding and curling processes, so as to reduce the generation of folding marks, and achieve a large stretching function, provide better support for the rollable display device, and have strong stability, stretching uniformity and recoverability, avoid situations such as screen deformation and cracking, and improve the service life. Description of the Drawings

[0018] Figure 1 It is a top view structural schematic diagram of the flexible support layer of the embodiment;

[0019] Figure 2 It is a partial enlarged schematic diagram of the flexible support layer of the embodiment;

[0020] Figure 3 It is a schematic diagram of the first hollow pattern and the second hollow pattern of the flexible support layer of the embodiment;

[0021] Figure 4 It is a cross-sectional schematic diagram of the flexible support layer assembly of the embodiment;

[0022] Figure 5 It is a cross-sectional schematic diagram of the rollable display device of the embodiment. Detailed Description of the Embodiment

[0023] The following further explains the present utility model in conjunction with the accompanying drawings and specific embodiments. The various drawings of the present utility model are only for illustration to more easily understand the present utility model, and its specific proportions can be adjusted according to design requirements. The up-and-down relationship of the relative components and the definition of the front / back in the described figures should be understood by those skilled in the art as referring to the relative positions of the components. Therefore, they can all be flipped to present the same components, and all of these should belong to the scope disclosed in this specification.

[0024] Reference Figure 1 and Figure 2 , in the embodiment, the flexible support layer 10 is applied to a rollable display device and serves as a support structure for a rollable screen. It includes a first hollow pattern and a second hollow pattern. The first hollow pattern is an array of elliptical patterns 11 arranged at intervals, including alternating first arrangement rows a and second arrangement rows b. In the first arrangement row a, the major axis direction of the elliptical pattern 11 is consistent with the row direction (the X direction in the figure), and in the second arrangement row b, the minor axis direction of the elliptical pattern 11 is consistent with the row direction (the X direction in the figure). The upper and lower rows are arranged in a staggered manner, so that in the Y direction perpendicular to the X direction, the elliptical patterns 11 in the spaced rows are aligned. The second hollow pattern is a cross-shaped pattern 12 arranged in the array intervals of the elliptical patterns 11; the center 121 of each cross-shaped pattern 12 is located between two adjacent elliptical patterns 11a and 11b in the first arrangement row a, and extends to form extension parts 122 in the four spaced areas between the two adjacent elliptical patterns 11a and 11b and the upper and lower row elliptical patterns 11c and 11d. An even stress dispersion effect is achieved. Through the settings of the first hollow pattern and the second hollow pattern, the flexible support layer has better flexibility, elasticity, and stability.

[0025] In this embodiment, the flexible support layer 10 adopts a structure composed of an oval grid, which can remain flat when unfolded and can automatically curl when curled. The characteristic of the oval is that it can stretch in one direction, with good flexibility and elasticity. The center points of the oval patterns 11 in the second arrangement row b and the midpoints of the intervals between adjacent oval patterns 11 in the first arrangement row a are located on the same straight line in the Y direction, and the distance between the farthest ends of adjacent oval patterns 11a and 11b in the first arrangement row a is equal to the distance between the farthest ends of the oval patterns 11c and 11d in the upper and lower second arrangement rows b, so as to achieve a regular and uniform arrangement to provide a uniform stress structure. The short axis length L2 of the oval pattern 11 is 50% - 65% of the long axis length L1. For example, the long axis length L1 is 2.4 mm and the short axis length L2 is 1.4 mm. In the first arrangement row a, the distance L3 between adjacent oval patterns 11 is 60% - 70% of the long axis length L1 of the oval pattern, for example, 1.6 mm, so as to provide an appropriate degree of hollowness to provide better bending ability and stretchability, and avoid problems such as poor recovery due to excessive deformation after stretching and delamination and breakage caused by insufficient hollowness area and inability to release tension during bending.

[0026] The cross-shaped pattern 12 is located between adjacent oval patterns 11a and 11b in the first arrangement row a. The line segment facing the adjacent oval pattern 11 is the first arc segment 123 parallel to the oval pattern 11. The distance L4 between the first arc segment 123 and the oval pattern 11 is 15% - 25% of the distance L3 between adjacent oval patterns, for example, 0.35 mm. An extension part 122 is formed between the two first arc segments 123. The end of the extension part 122 is closed by a second arc segment 124, so that the width of the end of the extension part 122 is greater than the width of the middle part. The extension parts 122 adjacent to four cross-shaped patterns 12 converge between two adjacent oval patterns in the second arrangement row b and do not connect to each other. By regularly arranging the cross-shaped patterns 12 in the intervals, on the one hand, the flexibility and elasticity of the oval structure are increased, making the oval structure softer and more elastic. On the other hand, the stability of the oval structure is increased, making the stress distribution of the material during bending more even, enhancing the ductility, and reducing the deformation amount after bending and unfolding. The cross-shaped pattern 12 is formed by a smooth transition of arc segments, which can effectively avoid stress concentration and make the stress more uniform. Compared with the overall film structure without the hollow pattern design, the support layer of the embodiment can increase the stretching amplitude by more than 10% and control the flatness error within ±0.10 mm through the combination of the first hollow pattern and the second hollow pattern, effectively reducing the generation of screen creases. After testing, the flexible support layer 10 of the embodiment still maintains good ductility and recovery after being bent hundreds of thousands of times.

[0027] The material of the flexible support layer 10 needs to have properties such as flexibility, wear resistance, high temperature resistance, and corrosion resistance, and is selected as PET, PU or CPI, with a thickness of 0.05 - 0.09 mm. Among them, the PET (polyethylene terephthalate) film has excellent transparency, impact resistance, and UV resistance; the PU (polyurethane) film has excellent flexibility, elasticity, and wear resistance; the CPI (colorless and transparent polyimide) film has excellent high temperature resistance, chemical corrosion resistance, and wear resistance, and also has excellent electrical and optical properties. The above materials provide good elasticity and recovery, and are suitable for the unfolding and curling working process and providing support.

[0028] Reference Figure 4 , The flexible support layer assembly of the embodiment includes a protective layer 20, the above flexible support layer 10, an adhesive layer 30, and a release layer 40 stacked in sequence. Among them, the adhesive layer 30 can be selected as PSA (pressure - sensitive adhesive), with a thickness of 0.01 - 0.03 mm. The flexible support layer assembly is suitable for the preparation, transportation, and storage of the flexible support layer. When in use, the release layer 40 is removed, and it can be adhered through the adhesive layer 30. The flexible support layer assembly can have the same hollow structure as the flexible support layer as a whole, and the hollow structures of its elliptical pattern and cross - shaped pattern can be realized by precision cutting techniques such as laser cutting through the assembly.

[0029] Reference Figure 5 , The roll - type display device of the embodiment includes a flexible display function layer 50 and the above flexible support layer 10. The flexible support layer 10 is bonded to one side of the display function layer 50 through the adhesive layer 30 to provide support. The X - direction of the flexible support layer 10 is consistent with the stretching and curling direction of the roll - type display device. In this direction, the elliptical pattern 11 and the cross - shaped pattern 12 are regularly arranged at intervals in a row. The flexible support layer 10 can maintain a uniform tension during the unfolding and curling processes, so as to reduce the generation of folding marks, and has strong stability, stretchability, stretching uniformity, and recovery. The display function layer includes conventional structures such as a touch layer and a display layer.

[0030] The above embodiments are only used to further illustrate a flexible support layer, a flexible support layer assembly, and a roll - type display device of the present invention for a roll - type display device. However, the present invention is not limited to the embodiments. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention all fall within the protection scope of the technical solution of the present invention.

Claims

1. A flexible support layer for a roll-up display device, characterized in that: The flexible support layer includes a first hollow pattern and a second hollow pattern; the first hollow pattern is an elliptical pattern arranged in an array, including alternating first and second rows, the long axis direction of the elliptical pattern in the first row is consistent with the row direction, the short axis direction of the elliptical pattern in the second row is consistent with the row direction, and the upper and lower rows are staggered; the second hollow pattern is a cross pattern arranged in the array interval of the elliptical pattern; The center of each cross-shaped pattern is located between two adjacent elliptical patterns in the first row, and extends to four spacing areas between the two adjacent elliptical patterns and the upper and lower rows of elliptical patterns.

2. The flexible support layer for a roll-up display device according to claim 1, characterized in that: The minor axis length L2 of the elliptical pattern is 50% to 65% of the major axis length L1.

3. The flexible support layer for a roll-up display device according to claim 1, characterized in that: In the first arrangement row, a distance L3 between adjacent elliptical patterns is 60% to 70% of a major axis length L1 of the elliptical pattern.

4. The flexible support layer for a roll-up display device according to claim 1, characterized in that: The line segment of the cross pattern facing the adjacent elliptical pattern is a first arc line segment parallel to the elliptical pattern.

5. The flexible support layer for a roll-up display device according to claim 4, characterized in that: The distance L4 between the first arc segment and the elliptical pattern is 15% to 25% of the distance L3 between adjacent elliptical patterns.

6. The flexible support layer for a roll-up display device according to claim 1, characterized in that: The cross-shaped pattern extends toward the four spacing areas to form an extension portion, and the extension portions adjacent to the four cross-shaped patterns converge between two adjacent elliptical patterns in the second arrangement row and are not connected to each other.

7. The flexible support layer for a roll-up display device according to claim 6, characterized in that: The end of the extension portion is closed by a second arc segment, and the width of the end of the extension portion is greater than the width of the middle portion.

8. The flexible support layer for a roll-up display device according to claim 1, characterized in that: The material of the flexible support layer is PET, PU or CPI, and the thickness is 0.05-0.09 mm.

9. A flexible supporting layer assembly for a scroll-type display device, characterized in that: The invention comprises a protective layer, a flexible supporting layer, an adhesive layer and a release layer which are stacked in sequence, wherein the flexible supporting layer is the flexible supporting layer according to any one of claims 1 to 8.

10. A scroll display device, characterized in that: It comprises a display function layer and a flexible supporting layer for a roll-up display device as claimed in any one of claims 1 to 8, wherein the flexible supporting layer is bonded to one side of the display function layer via an adhesive layer, wherein the row direction is consistent with the unfolding direction of the roll-up display device.

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