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

Abstract

The utility model discloses a flexible supporting layer, a flexible supporting layer assembly and a scroll type display device. The flexible supporting layer comprises a first hollowed-out pattern and a second hollowed-out pattern. The first hollow-out patterns are diamond-shaped patterns which are arranged at intervals in an array mode, the extension direction of a diagonal line of each diamond-shaped pattern in the array is consistent with the row direction, and the diamond-shaped patterns are arranged in an up-down staggered mode; the second hollowed-out patterns are cross-shaped patterns arranged at intervals in an array mode, and the cross-shaped patterns are arranged in the array intervals of the rhombic patterns. Wherein the center of each cross-shaped pattern is located between two adjacent rhombic patterns in the row, and four spacing areas between the two adjacent rhombic patterns and the upper and lower rhombic patterns extend to form arms. 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 and realize a large-amplitude stretching function, better support is provided for the scroll type display device, the scroll type display device has relatively high stability, and the service life of the scroll type display device is prolonged.

Description

Technical Field

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

[0002] A rollable screen is a new type of display technology, which can provide an experience of enlarging 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 the 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 use 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.

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

[0006] A flexible support layer is used in a rollable display device; the flexible support layer includes a first hollow pattern and a second hollow pattern; the first hollow pattern is a diamond pattern arranged at intervals in an array, and the extending direction of a diagonal line of each diamond pattern in the array is the same as the row direction, and is arranged in a staggered manner between the upper and lower rows; the second hollow pattern is a cross pattern arranged at intervals in an array, and the cross pattern is arranged in the array interval of the diamond pattern; the center of each cross pattern is located between two adjacent diamond patterns in the row, and extends to form arms in four interval areas between the two adjacent diamond patterns and the diamond patterns in the upper and lower rows.

[0007] Optionally, the interval areas of the first hollow pattern of the support layer form grid lines with the same width, and the center of the cross pattern is located at the intersection of the grid lines.

[0008] Optionally, the arm length of the cross pattern is not less than the side length of the diamond pattern and less than the distance between adjacent intersections.

[0009] Optionally, the arm width of the cross pattern is 10% - 30% of the width of the grid line.

[0010] Optionally, in the row direction, the spacing between adjacent diamond patterns is 40% to 60% of the diagonal length of the diamond pattern, and the diagonal length of the diamond pattern is 2.5 to 3 mm.

[0011] Optionally, the material of the flexible support layer is PET, PU or CPI, and the thickness is 0.05 to 0.09 mm.

[0012] Optionally, the diamond pattern is a square, and the four corners of the square are rounded corner structures; the corners of the cross pattern are all rounded corner structures.

[0013] Optionally, the row direction is consistent with the unfolding direction of the rollable display device.

[0014] A flexible support layer assembly 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 includes a display function layer and the flexible support layer described above, and the flexible support layer is bonded to one side of the display function layer through an adhesive layer.

[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, 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 Embodiments

[0023] The present utility model will be further explained below 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 elements and the definition of the front / back in the figures described in the text should be understood by those skilled in the art to refer 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 a diamond pattern 11 arranged at intervals in an array, preferably square. In the array, the extending direction of one diagonal of each diamond pattern 11 is the same as the row direction (the X direction in the figure), and the extending direction of the other diagonal is the same as the Y direction, and the X direction and the Y direction are perpendicular to each other; the upper and lower rows are arranged in a staggered manner, that is, in the Y direction, the diamond patterns 11 are aligned at intervals of rows. The second hollow pattern is a cross pattern 12 arranged at intervals in an array, and the cross pattern 12 is arranged in the array intervals of the diamond patterns 11; the center 121 of each cross pattern 12 is located between two adjacent diamond patterns 11a and 11b in the row, and extends to form arms 122 in the four interval areas between the two adjacent diamond patterns 11a and 11b and the diamond patterns 11c and 11d in the upper and lower rows, achieving a uniform stress dispersion effect. 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 interval areas of the first hollow pattern of the flexible support layer 10 form grid lines 13 with the same width. The use of a grid structure can improve the flatness when unfolded, and at the same time can automatically curl when curled, and can expand and contract in multiple directions, having good flexibility and elasticity. The center 121 of the cross pattern 12 is located at the intersection 13a of the grid lines 13. Combining Figure 2 and Figure 3, the arm length L2 of the cross-shaped pattern 12 is not less than the side length L1 of the rhombus pattern 11 and less than the distance between the central points of adjacent intersections. Thus, the cross-shaped patterns 12 can be considered to be arranged with a row interval in the rows and columns of the rhombus pattern 11 and aligned in the Y direction. The arms 122 of the four adjacent cross-shaped patterns 12 converge at the intersection 13b in the interval row but are not connected to each other. Through the regular arrangement of the cross-shaped patterns 12 in the interval, on the one hand, the flexibility and elasticity of the rhombus structure are increased, making the rhombus structure softer and more elastic. On the other hand, the stability of the rhombus structure is increased, making the force distribution during bending of the material more average as a whole, enhancing the ductility, and reducing the deformation amount after bending and unfolding. Compared with the overall film structure without the hollow pattern design, 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.

[0026] In the row direction, as Figure 3 shown, the diagonal length L3 of the rhombus pattern 11 is 2.5 - 3 mm, and the distance L4 between adjacent rhombus patterns 11 is 40% - 60% of the diagonal length L3 of the rhombus pattern. For example, the diagonal length L3 is 2.7 mm and the distance L4 is 1.3 mm, thereby providing an appropriate degree of hollowness to provide better bending ability and stretchability, avoiding excessive deformation amount after stretching resulting in poor recovery and delamination and breakage due to insufficient hollow area and inability to release tension during bending. The arm width D1 of the cross-shaped pattern is 10% - 30% of the width D2 of the grid line. For example, the arm width D1 is 0.15 mm and the grid line width D2 is 0.85 mm, which can provide a more reasonable force structure on the premise of meeting the processing accuracy requirements. The four corners of the rhombus pattern 11 are fillet structures 111, and the corners of the cross-shaped pattern 12 are all fillet structures 123, which can effectively avoid stress concentration and make the force more uniform.

[0027] The material of the flexible support layer 10 needs to have characteristics 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 ultraviolet 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 has excellent electrical and optical properties. The above materials provide good elasticity and recovery, are suitable for the working process of unfolding and curling, and provide support. The hollow structures of the rhombus pattern and the cross-shaped pattern can be realized by precision cutting technologies such as laser cutting.

[0028] Reference Figure 4, The flexible support layer assembly of the embodiment includes a protective layer 20, the above-mentioned 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), and its thickness is 0.01 - 0.03 mm. The flexible support layer assembly is applicable to the preparation, transportation, and storage of the flexible support layer. During use, the release layer 40 is removed, and it can be adhered through the adhesive layer 30. The flexible support layer assembly can integrally have the same hollow structure as the flexible support layer, and the hollow structures of its diamond pattern and cross pattern can be realized by precise cutting techniques such as laser cutting through the assembly.

[0029] Reference Figure 5 , The rollable display device of the embodiment includes a flexible display function layer 50 and the above-mentioned 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 unfolding and curling direction of the rollable display device. In this direction, the diamond patterns 11 and cross patterns 12 are regularly arranged at intervals in rows. The flexible support layer 10 can maintain uniform tension during the unfolding and curling processes to reduce the generation of folding marks, and has strong stability, stretchability, uniformity of stretching, and recoverability. 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 rollable display device of the present invention. 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 supporting layer, characterized in that: The flexible support layer is used in a scroll-type display device; the flexible support layer includes a first hollow pattern and a second hollow pattern; the first hollow pattern is a rhombus pattern arranged in an array, wherein the diagonal extension direction of each rhombus pattern in the array is consistent with the row direction, and the upper and lower rows are arranged in a staggered manner; the second hollow pattern is a cross pattern arranged in an array, wherein the cross pattern is arranged in the array interval of the rhombus pattern; The center of each cross-shaped pattern is located between two adjacent diamond-shaped patterns in a row, and extends to four spacing areas between the two adjacent diamond-shaped patterns and the upper and lower row diamond patterns to form arms.

2. The flexible supporting layer according to claim 1, characterized in that: The interval areas of the first hollow pattern of the support layer form grid lines with the same width, and the center of the cross pattern is located at the intersection of the grid lines.

3. The flexible supporting layer according to claim 2, characterized in that: The arm length of the cross pattern is not less than the side length of the diamond pattern and is less than the distance between adjacent intersections.

4. The flexible supporting layer according to claim 2, characterized in that: The arm width of the cross pattern is 10% to 30% of the width of the grid lines.

5. The flexible supporting layer according to claim 1, characterized in that: In the row direction, the spacing between adjacent diamond patterns is 40% to 60% of the diagonal length of the diamond pattern, and the diagonal length of the diamond pattern is 2.5 to 3 mm.

6. The flexible supporting layer 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.

7. The flexible supporting layer according to claim 1, characterized in that: The diamond pattern is a square, and the four corners of the square are rounded structures; the corners of the cross pattern are all rounded structures.

8. The flexible supporting layer according to claim 1, characterized in that: The row direction is consistent with the unfolding direction of the scroll-type display device.

9. A flexible support layer assembly, 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 the flexible supporting layer according to 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.

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