Display device

Abstract

To provide a display device that can suppress reduction in quality while suppressing a display panel from becoming difficult to roll up.SOLUTION: A display device 10 comprises a display panel 12, a drive board 14 that drives the display panel 12, a flexible board 16 that connects the display panel 12 and the drive board 14, a core material 24 to which the drive board 14 is fixed and which rolls up the display panel 12 and the flexible board 16, and a connection member 20 having a plate-shaped member 40 that is laminated on the display panel 12 and that connects the display panel 12 and the core material 24. The plate-shaped member 40 includes a first portion 46 overlapping the display panel 12 and curved in a state where the display panel 12 is rolled up around the core material 24 and a second portion 48 overlapping the flexible board 16 and curved in a state where the flexible board 16 is rolled up around the core material 24. In a roll-up direction of the plate-shaped member 40, an elongation rate of the second portion 48 is smaller than an elongation rate of the first portion 46.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a display device, and more particularly to a display device including a flexible display panel. [Background technology]

[0002] Conventionally, display devices including a flexible display panel have been known. As an example of this type of display device, Patent Document 1 discloses a display device including a flexible display panel, a circuit board for driving the display panel, a flexible film connecting the display panel and the circuit board, a back cover laminated on the display panel, and a core material to which the circuit board and the back cover are fixed and for rolling up the display panel, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6698920 Summary of the Invention [Problem to be solved by the invention]

[0004] If the elasticity of the portion of the back cover that overlaps with the flexible film is made the same as that of the portion that overlaps with the display panel, it becomes easier to roll up the display panel, but there is a problem that poor contact occurs due to the flexible film being pulled when rolling up the display panel, resulting in a decrease in quality. Also, if the portion of the back cover that overlaps with the flexible film is not curved, there is a problem that it becomes difficult to roll up the display panel, etc.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a display device that can suppress deterioration in quality while suppressing difficulty in rolling up the display panel. [Means for solving the problem]

[0006] One embodiment of a display device according to the present disclosure comprises a display panel having flexibility, a driving substrate for driving the display panel, a flexible substrate connecting the display panel and the driving substrate and having flexibility, a core material to which the driving substrate is fixed and for winding up the display panel and the flexible substrate, and a connecting member having a plate-shaped member laminated on the display panel and connecting the display panel and the core material and being wound up around the core material together with the display panel and the flexible substrate, the plate-shaped member having a first portion overlapping the display panel and curving when the display panel is wound around the core material, and a second portion overlapping the flexible substrate and curving when the flexible substrate is wound around the core material, and an elongation rate of the second portion in the winding direction of the plate-shaped member is smaller than an elongation rate of the first portion. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a display device that can suppress deterioration in quality while suppressing difficulty in rolling up a display panel. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a display device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the display device of FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing a part of the display panel of the display device of FIG. [Figure 4] FIG. 4 is a diagram showing a cross section of the display device and a connecting member of FIG. [Diagram 5] FIG. 5 is a diagram showing a portion surrounded by a dashed line C and a portion surrounded by a dashed line D in FIG. [Figure 6] FIG. 6 is a diagram showing an example of a connecting member used in an experiment to determine the elongation percentage. [Figure 7]FIG. 7 is a diagram showing the results of an experiment to determine the elongation percentage using the connecting member of FIG. [Figure 8] FIG. 8 is a diagram showing examples of materials for the protective member. [Figure 9] FIG. 9 is a diagram showing a cross section of the display device and a connecting member according to the second embodiment. [Figure 10] FIG. 10 is a diagram showing another example of a connecting member used in an experiment to determine the elongation percentage. [Figure 11] FIG. 11 is a diagram showing the results of an experiment to determine the elongation percentage using the connecting member of FIG. [Figure 12] FIG. 12 is a cross-sectional view showing a display device according to the third embodiment. [Figure 13] FIG. 13 is a diagram showing a cross section of the display device and a connecting member according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the display device according to the present disclosure will be described with reference to the drawings. Note that each of the embodiments described below shows a specific example of the present disclosure. Therefore, the numerical values, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, components that are not described in the independent claims will be described as optional components.

[0010] In each drawing, substantially the same components are denoted by the same reference numerals, and each drawing is a schematic view, and the size ratio of each part is not necessarily strictly represented.

[0011] In the following description, the first direction is the direction indicated by the X-axis in Figures 1 to 6, 9, 10, 12, and 13, the second direction is the direction indicated by the Y-axis in Figures 1 to 6, 9, 10, 12, and 13, and the third direction is the direction indicated by the Z-axis in Figures 1 to 6, 9, 10, 12, and 13. The first direction, second direction, and third direction are perpendicular to each other.

[0012] (Embodiment 1) A display device 10 according to the first embodiment will be described with reference to FIGS.

[0013] FIG. 1 is a perspective view showing a display device 10 according to the first embodiment. (a) of FIG. 1 shows a state in which the display panel 12 and the like are pulled out, and (b) of FIG. 1 shows a state in which the display panel 12 and the like are wound up. FIG. 2 is a cross-sectional view showing the display device 10 of FIG. 1. (a) of FIG. 2 shows a cross-section taken along line IIa-IIa in (a) of FIG. 1, and (b) of FIG. 2 shows a cross-section taken along line IIb-IIb in (b) of FIG. 1. FIG. 3 is a cross-sectional view showing a part of the display panel 12 and the like of the display device 10 of FIG. 1. FIG. 4 is a diagram showing a cross-section of the display device 10 of FIG. 1 and a connecting member 20. (a) of FIG. 4 shows a cross-section of the display device 10, and (b) of FIG. 4 shows the connecting member 20. FIG. 5 is a diagram showing a part surrounded by a dashed line C and a part surrounded by a dashed line D in FIG. 4. Fig. 5(a) shows a portion surrounded by dashed line C in Fig. 4, and Fig. 5(b) shows a portion surrounded by dashed line D in Fig. 4. Note that in Fig. 2 and Fig. 4(a), illustration of the multiple first through holes 42 and the multiple second through holes 44, etc. is omitted to avoid cluttering the drawings. The same applies to Fig. 9(a), Fig. 12, and Fig. 13(a).

[0014] 1 to 5, the display device 10 is a device that displays images and the like, and includes a display panel 12, a drive substrate 14, a flexible substrate 16, an optical adhesive sheet (OCA: Optical Clear Adhesive) 18, a connecting member 20, a protective member 22, a core material 24, a pantograph unit 26, and a motor 28. The display device 10 is a rollable display device that can roll up the display panel 12, the flexible substrate 16, the optical adhesive sheet 18, the connecting member 20, and the protective member 22, and can pull out the rolled up display panel 12, etc. For example, the display device 10 is used in tablet terminals, digital televisions, digital signage, smartphones, wearable terminals, and the like.

[0015] The display panel 12 is a panel that displays an image and has flexibility. The display panel 12 is a so-called flexible display. When pulled out from the core material 24, the display panel 12 has a rectangular shape with the first direction as the short side direction and the second direction as the long side direction, and is a plate-like shape with the third direction as the thickness direction, and displays an image toward one side of the third direction (the positive side in the Z-axis direction). The display panel 12 has a cover window 30, an optical adhesive sheet 32, a circular polarizer 34, an optical adhesive sheet 36, and an OLED (Organic Light Emitting Diode) panel 38. The cover window 30, the optical adhesive sheet 32, the circular polarizer 34, the optical adhesive sheet 36, and the OLED panel 38 are laminated in this order in the thickness direction of the display panel 12. The thickness direction of the display panel 12 coincides with the thickness direction of the optical adhesive sheet 18, the thickness direction of the plate-like member 40, and the thickness direction of the protection member 22. The cover window 30 is adhered to a circular polarizer 34 via an optical adhesive sheet 32, and the circular polarizer 34 is adhered to an OLED panel 38 via an optical adhesive sheet 36. For example, the OLED panel 38 is configured by laminating a TFT (thin film transistor), an OLED having an organic EL element, and a TFE (thin film encapsulation).

[0016] The driving substrate 14 is a substrate for driving the display panel 12, and is electrically connected to the display panel 12 via the flexible substrate 16. The driving substrate 14 has a circuit for driving the display panel 12. The driving substrate 14 is provided in front of the display panel 12 in the winding direction, and is fixed to the main body 52 of the core material 24 inside the main body 52. ​​The winding direction is the direction in which the display panel 12, the flexible substrate 16, the optical adhesive sheet 18, the connecting member 20, and the protective member 22 move when the core material 24 winds up the display panel 12, the flexible substrate 16, the optical adhesive sheet 18, the connecting member 20, and the protective member 22. For example, the driving substrate 14 is a PCB (Printed Circuit Board).

[0017] The flexible substrate 16 is a substrate for electrically connecting the display panel 12 and the drive substrate 14, and has flexibility. The flexible substrate 16 is connected to the display panel 12 and the drive substrate 14, and connects the display panel 12 and the drive substrate 14. That is, the flexible substrate 16 connects the display panel 12 and the drive substrate 14 via the flexible substrate 16 so that they are not separated from each other. The flexible substrate 16 is connected to the front end of the OLED panel 38 in the winding direction, and protrudes forward in the winding direction from the OLED panel 38. When the flexible substrate 16 is pulled out from the core material 24, the flexible substrate 16 has a portion that does not overlap with the display panel 12 when viewed from the third direction. The front end of the flexible substrate 16 in the winding direction is connected to the drive substrate 14. The flexible substrate 16 does not have to be directly connected to the display panel 12 and the drive substrate 14, and may be indirectly connected to the display panel 12 and the drive substrate 14 via, for example, other members or the like. For example, the flexible substrate 16 is a COF (Chip On Film).

[0018] The optical adhesive sheet 18 is attached to the main surface of the display panel 12 on the connecting member 20 side, and is laminated on the display panel 12. The optical adhesive sheet 18 is attached to the entire main surface of the display panel 12. For example, the optical adhesive sheet 18 can be an acrylic-based, silicone-based, epoxy-based, or rubber-based adhesive.

[0019] The connecting member 20 has a plate-shaped member 40, a plurality of first through holes 42, and a plurality of second through holes 44.

[0020] The plate-shaped member 40 is laminated on the display panel 12 via the optical adhesive sheet 18, and is adhered to the display panel 12 via the optical adhesive sheet 18. The plate-shaped member 40 is adhered to the back surface of the display panel 12. The plate-shaped member 40 protrudes forward from the display panel 12 in the winding direction. The front end of the plate-shaped member 40 in the winding direction is fixed to the outer peripheral surface of the core material 24, and the plate-shaped member 40 connects the display panel 12 and the core material 24. In other words, the plate-shaped member 40 connects the display panel 12 and the core material 24 via the plate-shaped member 40 so that they are not separated from each other. The rear end of the plate-shaped member 40 in the winding direction is fixed to the first support member 56 of the pantograph section 26. The plate-shaped member 40 has flexibility, and is wound around the core material 24 together with the display panel 12, the flexible substrate 16, the optical adhesive sheet 18, and the protective member 22. The plate-like member 40 is a reinforcing member that has a higher rigidity than the display panel 12 and the flexible substrate 16, and maintains the flatness of the display panel 12 when the display panel 12 is pulled out from the core material 24. When the plate-like member 40 is pulled out from the core material 24, the plate-like member 40 is rectangular in shape with the first direction as the short side direction and the second direction as the long side direction, and the third direction as the thickness direction. Note that when the plate-like member 40 is pulled out from the core material 24, the plate-like member 40 is not limited to a rectangular shape with the first direction as the short side direction and the second direction as the long side direction, but may be, for example, a rectangular shape with the first direction as the long side direction and the second direction as the short side direction. In addition, the plate-like member 40 does not have to be rectangular, and may be, for example, a square shape, another polygonal shape, a circular shape, an elliptical shape, or the like. For example, the plate-like member 40 is formed of a metal having a large elastic region, such as SUS301. The plate-shaped member 40 has a first portion 46 and a second portion 48 .

[0021] The first portion 46 overlaps with the display panel 12 in the thickness direction of the plate-like member 40. The first portion 46 is laminated on the display panel 12 via the optical adhesive sheet 18, and is adhered to the display panel 12 via the optical adhesive sheet 18. When viewed from the third direction, the first portion 46 has a rectangular shape with the first direction as the short side direction and the second direction as the long side direction, and overlaps with the display panel 12, in a state in which the first portion 46 is pulled out from the core material 24. Note that the first portion 46 is not limited to a rectangular shape with the first direction as the short side direction and the second direction as the long side direction in a state in which the first portion 46 is pulled out from the core material 24, but may be, for example, a rectangular shape with the first direction as the long side direction and the second direction as the short side direction. The first portion 46 is curved in a state in which the display panel 12 is wound around the core material 24. That is, the plate-like member 40 is wound around the core material 24 with the first portion 46 in a curved state.

[0022] The second portion 48 overlaps with the flexible substrate 16 in the thickness direction of the plate-like member 40. The second portion 48 is provided with a gap between it and the flexible substrate 16. When viewed from the third direction in a state in which the second portion 48 is pulled out from the core material 24, the second portion 48 has a rectangular shape with the first direction as its longitudinal direction and the second direction as its short side direction, and overlaps with the flexible substrate 16. The second portion 48 is curved in a state in which the flexible substrate 16 is wound around the core material 24. In other words, the plate-like member 40 is wound around the core material 24 with the second portion 48 in a curved state.

[0023] The second portion 48 is located in front of the first portion 46 in the winding direction and is adjacent to the first portion 46. A boundary 50 between the first portion 46 and the second portion 48 extends in an orthogonal direction that is orthogonal to the thickness direction of the plate-like member 40 and orthogonal to the winding direction, and overlaps with the display panel 12 in the thickness direction of the plate-like member 40. The orthogonal direction is a direction that coincides with the first direction. A part of the second portion 48, specifically, a rear end portion of the second portion 48 in the winding direction overlaps with the display panel 12 and is adhered to the display panel 12 via the optical adhesive sheet 18. For example, the boundary 50 is a midpoint between the first through hole 42 and the second through hole 44 adjacent to each other in the winding direction.

[0024] The stretch rate of the second portion 48 in the winding direction is smaller than that of the first portion 46. The stretch rate of the second portion 48 in the winding direction is (stretched dimension of the second portion 48 in the winding direction) / (dimension of the second portion 48 in the winding direction), and the stretch rate of the first portion 46 in the winding direction is (stretched dimension of the first portion 46 in the winding direction) / (dimension of the first portion 46 in the winding direction). For example, the dimension of the second portion 48 in the winding direction is the dimension from the front end of the foremost second through hole 44 to the rear end of the last second through hole 44 in the winding direction. Also, the dimension of the first portion 46 in the winding direction is the dimension from the front end of the foremost first through hole 42 to the rear end of the last first through hole 42 in the winding direction.

[0025] The first through holes 42 are arranged in a staggered manner in the first portion 46. That is, the first through holes 42 have a plurality of first hole rows each composed of one or more first through holes 42 arranged in the orthogonal direction, and the first hole rows are arranged in the winding direction, and the first through holes 42 in the first hole rows adjacent to each other in the winding direction among the plurality of first hole rows are adjacent to each other in a state shifted in the orthogonal direction. The first through holes 42 are arranged at equal intervals in the orthogonal direction and at equal intervals in the winding direction. In the first embodiment, the first through holes 42 are arranged in a staggered manner from the front end to the rear end of the first portion 46 in the winding direction. Each of the first through holes 42 penetrates the plate-shaped member 40 in the thickness direction of the plate-shaped member 40, is an elongated hole extending in the orthogonal direction, and is elliptical. Each of the first through holes 42 does not have to be elliptical, and may be, for example, rectangular. For example, the multiple first through holes 42 are formed by wet etching or the like.

[0026] When the dimension of each of the multiple first through holes 42 in the orthogonal direction is L1 and the dimension between each two adjacent first through holes 42 in the orthogonal direction among the multiple first through holes 42 is S1, L1>S1. S1 is the dimension of a portion between each two adjacent first through holes 42 in the orthogonal direction among the multiple first through holes 42 where no first through holes 42 are provided. In the first embodiment, L1 / S1=3 / 0.1.

[0027] When the dimension of each of the multiple first through holes 42 in the winding direction is W1 and the dimension between each two adjacent first through holes 42 among the multiple first through holes 42 in the winding direction is T1, W1>T1. T1 is the dimension of a portion between each two adjacent first through holes 42 among the multiple first through holes 42 in the winding direction where no first through holes 42 are provided.

[0028] The second through holes 44 are arranged in a staggered manner in the second portion 48. That is, the second through holes 44 have a plurality of second hole rows each composed of one or more second through holes 44 arranged in the perpendicular direction, and the second hole rows are arranged in the winding direction, and the second through holes 44 in the second hole rows adjacent to each other in the winding direction among the plurality of second hole rows are adjacent to each other in a state of being shifted in the perpendicular direction. The second through holes 44 are arranged at equal intervals in the perpendicular direction and at equal intervals in the winding direction. In the first embodiment, the second through holes 44 are arranged in a staggered manner from the front end to the rear end of the second portion 48 in the winding direction. Each of the second through holes 44 penetrates the plate-shaped member 40 in the thickness direction of the plate-shaped member 40, is an elongated hole extending in the perpendicular direction, and is oval. Each of the second through holes 44 does not have to be oval, and may be, for example, rectangular. For example, the multiple second through holes 44 are formed by wet etching or the like.

[0029] When the dimension of each of the multiple second through holes 44 in the orthogonal direction is L2 and the dimension between each two adjacent second through holes 44 among the multiple second through holes 44 in the orthogonal direction is S2, L2>S2. S2 is the dimension of a portion between each two adjacent second through holes 44 in the orthogonal direction among the multiple second through holes 44 where no second through holes 44 are provided. In the first embodiment, L2 / S2=1 / 0.1, and (L1 / S1)>(L2 / S2). Also, L2 <L1であり、S2=S1である。

[0030] When the dimension of each of the multiple second through holes 44 in the winding direction is W2 and the dimension between each two adjacent second through holes 44 among the multiple second through holes 44 in the winding direction is T2, W2>T2. T2 is the dimension of a portion between each two adjacent second through holes 44 among the multiple second through holes 44 in the winding direction where no second through holes 44 are provided. In the first embodiment, W1=W2 and T1=T2.

[0031] As described above, by providing the first portion 46 with the multiple first through holes 42 and the second portion 48 with the multiple second through holes 44, the elongation rate of the second portion 48 in the winding direction is smaller than the elongation rate of the first portion 46. Note that the configuration of the multiple first through holes 42 and the second through holes 44 is not limited to the above-mentioned configuration, and it is sufficient that the configuration is such that the elongation rate of the second portion 48 in the winding direction is smaller than the elongation rate of the first portion 46.

[0032] Also, for example, the first portion 46 may be provided with a plurality of recesses instead of the plurality of first through holes 42, and the second portion 48 may be provided with a plurality of recesses instead of the plurality of second through holes 44, so that the elongation rate of the second portion 48 in the winding direction is smaller than that of the first portion 46. Also, the first portion 46 may not be provided with a plurality of first through holes 42, the second portion 48 may not be provided with a plurality of second through holes 44, and the first portion 46 and the second portion 48 may be made of different materials, so that the elongation rate of the second portion 48 in the winding direction is smaller than that of the first portion 46.

[0033] The protective member 22 is a back cover for preventing the surface of the display panel 12 from being damaged when the display panel 12 or the like is wound up, and is laminated on the connecting member 20. The protective member 22 has adhesiveness and is adhered to the main surface of the connecting member 20 opposite the display panel 12. When the protective member 22 is pulled out from the core material 24 and viewed from the third direction, the protective member 22 has a rectangular shape with the first direction as the short side direction and the second direction as the long side direction, and is a plate shape with the third direction as the thickness direction, and overlaps with the display panel 12. For example, the protective member 22 is formed of urethane, silicone, or the like. Note that the protective member 22 may not have adhesiveness and may be adhered to the connecting member 20 via an adhesive or the like.

[0034] The core 24 is a roller to which the driving substrate 14 and the plate-like member 40 are fixed, and which is used to wind up the display panel 12, the flexible substrate 16, the optical adhesive sheet 18, the connecting member 20, and the protective member 22. ,centre The core 24 is a member around which the flexible substrate 16, the optical adhesive sheet 18, the connecting member 20, and the protective member 22 are wound when they are wound up. The core 24 has a main body 52 and a through portion 54. The main body 52 is 1 The main body 52 has a generally cylindrical shape with the axial direction being the front end of the plate-like member 40 in the winding direction, and the front end of the plate-like member 40 in the winding direction is fixed to the outer circumferential surface of the main body 52. ​​The through-hole 54 penetrates the main body 52 in the radial direction of the main body 52 and extends in the axial direction of the main body 52. ​​The flexible substrate 16 is inserted into the through-hole 54.

[0035] The pantograph section 26 has a first support member 56, a second support member 58, a first arm section 60, and a second arm section 62. The first support member 56 sandwiches the rear end of the plate member 40 and the rear end of the protective member 22 in the winding direction, and is attached to the rear end of the plate member 40 and the rear end of the protective member 22 in the winding direction. The second support member 58 is fixed to a member (not shown) that rotatably supports the core material 24. The first arm section 60 and the second arm section 62 connect the first support member 56 and the second support member 58, respectively, and apply a force in a direction in which the first support member 56 and the second support member 58 move away from each other.

[0036] The motor 28 rotates the core material 24. By rotating the motor 28 in one direction, the core material 24 rotates in one direction about the axis O, the first support member 56 moves in a direction away from the second support member 58, and the display panel 12 and the like are pulled out from the core material 24 (see arrow E1 in FIGS. 1 and 2). By rotating the motor 28 in the other direction, the core material 24 rotates in the other direction about the axis O, the first support member 56 moves in a direction approaching the second support member 58, and the display panel 12 and the like are wound up (see arrow E2 in FIGS. 1 and 2).

[0037] Fig. 6 is a diagram showing an example of a connecting member 64 used in an experiment to determine the elongation rate. Fig. 6(a) shows the entire connecting member 64, and Fig. 6(b) shows the portion surrounded by the dashed line in Fig. 6(a). Fig. 7 is a diagram showing the results of an experiment to determine the elongation rate using the connecting member 64 of Fig. 6. Note that in Fig. 6(a), the through-hole 72 is omitted to avoid cluttering the drawing.

[0038] As shown in Fig. 6, the connecting member 64 has a dimension of 245 [mm] in the winding direction, a dimension of 321.9 [mm] in the perpendicular direction, and a dimension of 0.2 [mm] in the thickness direction of the connecting member 64, and is made of SUS301. No through hole is formed in a portion 66 of the connecting member 64 from the front end to the rear end 9.2 [mm] in the winding direction, no through hole is formed in a portion 68 of the connecting member 64 from the rear end to the front end 10.3 [mm] in the winding direction, and a plurality of through holes 72 are provided in a staggered manner in a portion 70 between the portion 66 and the portion 68. The dimension of each of the plurality of through holes 72 in the winding direction is 0.2 [mm], and the dimension between each two adjacent through holes 72 in the winding direction among the plurality of through holes 72 is 0.1 [mm].

[0039] 6 and 7, when the dimension of each of the multiple through holes 72 in the orthogonal direction is L and the dimension between each two adjacent through holes 72 in the orthogonal direction among the multiple through holes 72 is S, if L=1[mm] and S=0.1[mm], when loads of 0[g], 200[g], 600[g], and 1000[g] are applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction is 0[%]. That is, in this case, the connecting member 64 bends but does not elongate in the winding direction.

[0040] When L=2[mm] and S=0.1[mm], when a load of 0[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 0[%], and when a load of 200[g] was applied to the connecting member 64, the elongation rate of the connecting member 64 in the winding direction was 0.2[%]. In this case, when a load of 600[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 0.7[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 64 in the winding direction was 1.1[%].

[0041] When L=3[mm] and S=0.1[mm], when a load of 0[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 0[%], and when a load of 200[g] was applied to the connecting member 64, the elongation rate of the connecting member 64 in the winding direction was 0.9[%]. In this case, when a load of 600[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 2.7[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 64 in the winding direction was 4.4[%].

[0042] When L=4[mm] and S=0.1[mm], when a load of 0[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 0[%], and when a load of 200[g] was applied to the connecting member 64, the elongation rate of the connecting member 64 in the winding direction was 2.7[%]. In this case, when a load of 600[g] was applied to the connecting member 64 in the winding direction, the elongation rate of the connecting member 64 in the winding direction was 8.0[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 64 in the winding direction was 13.3[%].

[0043] In this way, the larger L is relative to S, i.e., the larger L / S is, the larger the elongation rate in the winding direction is, and the easier it is to stretch in the winding direction. In the above-mentioned connecting member 20, L1 / S1=3 / 0.1 and L2 / S2=1 / 0.1, so it can be seen that the elongation rate of the second portion 48 in the winding direction is smaller than the elongation rate of the first portion 46.

[0044] FIG. 8 is a diagram showing examples of materials for the protective member 22. As shown in FIG.

[0045] As shown in FIG. 8, a protective member 22 formed using urethane foam and having a thickness of 500 μm has a tensile strength of 0.74 MPa, a tensile elongation of 350%, and a heat resistance of 80° C.

[0046] The protective member 22, which is formed using silicone foam and has a thickness of 700 [μm], has a tensile strength of 0.32 [MPa], a tensile elongation of 70 [%], and a heat resistance of 180 [° C.].

[0047] The protective member 22 having a thickness of 500 μm and formed using a urethane foam film support has a tensile strength of 224 MPa in the transverse direction (TD) and 188 MPa in the machine direction (MD), a tensile elongation of 100% in the TD and 134% in the MD, and a heat resistance of 80°C.

[0048] The protective member 22, which is 300 μm thick and made of nylon 66, has a tensile strength of 244 MPa in TD and 236 MPa in MD, a tensile elongation of 30% in TD and 27% in MD, and a heat resistance of 150°C.

[0049] The protective member 22, which is made of Kevlar and has a thickness of 500 μm, has a tensile strength of 3400 MPa, a tensile elongation of 3.3%, and a heat resistance of 250° C.

[0050] The display device 10 has been described above.

[0051] The display device 10 of embodiment 1 comprises a display panel 12 having flexibility, a driving substrate 14 for driving the display panel 12, a flexible substrate 16 connecting the display panel 12 and the driving substrate 14 and having flexibility, a core material 24 to which the driving substrate 14 is fixed and for winding up the display panel 12 and the flexible substrate 16, and a connecting member 20 having a plate-shaped member 40 that is laminated on the display panel 12 and connects the display panel 12 and the core material 24 and is wound up around the core material 24 together with the display panel 12 and the flexible substrate 16, the plate-shaped member 40 having a first portion 46 that overlaps with the display panel 12 and curves when the display panel 12 is wound around the core material 24, and a second portion 48 that overlaps with the flexible substrate 16 and curves when the flexible substrate 16 is wound around the core material 24, and the extensibility of the second portion 48 in the winding direction of the plate-shaped member 40 is smaller than the extensibility of the first portion 46.

[0052] According to this, of the plate-like member 40 connecting the display panel 12 and the core material 24, the second portion 48 overlapping the flexible substrate 16 has a smaller elongation rate in the winding direction than the first portion 46 overlapping the display panel 12. Therefore, when the core material 24 winds up the display panel 12, the first portion 46 is made easier to stretch, making it easier to wind up the display panel 12, and the second portion 48 can prevent the flexible substrate 16 from being pulled, so that poor contact caused by the flexible substrate 16 being pulled can be prevented, and deterioration in quality can be prevented. In this way, deterioration in quality can be prevented while preventing the display panel 12 from becoming difficult to wind up.

[0053] In the display device 10 according to the first embodiment, the second portion 48 is adhered to the display panel 12.

[0054] According to this, when the core material 24 winds up the display panel 12, etc., the second portion 48 can prevent the display panel 12 from being pulled, and therefore it is possible to prevent the flexible substrate 16 connected to the display panel 12 from being pulled. Therefore, it is possible to further prevent the occurrence of poor contact and the like caused by the flexible substrate 16 being pulled, and it is possible to further prevent deterioration in quality.

[0055] Furthermore, in the display device 10 of embodiment 1, the connecting member 20 has a plurality of first through holes 42 arranged in a staggered pattern in the first portion 46 and a plurality of second through holes 44 arranged in a staggered pattern in the second portion 48, and when the dimension of each of the plurality of first through holes 42 in the orthogonal direction perpendicular to the thickness direction of the plate-like member 40 and perpendicular to the winding direction is L1, the dimension between every two adjacent first through holes 42 among the plurality of first through holes 42 in the orthogonal direction is S1, the dimension of each of the plurality of second through holes 44 in the orthogonal direction is L2, and the dimension between every two adjacent second through holes 44 among the plurality of second through holes 44 in the orthogonal direction is S2, then (L1 / S1)>(L2 / S2) is satisfied.

[0056] According to this, referring to the above-mentioned experimental results, since the larger the L / S, the greater the elongation rate in the winding direction, by satisfying (L1 / S1)>(L2 / S2), the elongation rate of the second portion 48 in the winding direction can be made smaller than the elongation rate of the first portion 46. Therefore, it is possible to prevent the occurrence of poor contact and the like caused by flexible substrate 16 being pulled, and to prevent deterioration of quality.

[0057] Moreover, in the display device 10 according to the first embodiment, (L1 / S1)=(3 / 0.1) is satisfied, and (L2 / S2)=(1 / 0.1) is satisfied.

[0058] According to this, referring to the above-mentioned experimental results, by satisfying (L1 / S1)=(3 / 0.1), the first portion 46 can be stretched appropriately in the winding direction, and by satisfying (L2 / S2)=(1 / 0.1), the second portion 48 can be prevented from stretching in the winding direction. Therefore, it is possible to further prevent the display panel 12 from becoming difficult to wind, while further preventing deterioration in quality.

[0059] (Embodiment 2) A display device 10a according to a second embodiment will be described with reference to Fig. 9 to Fig. 11. The display device 10a is mainly different from the display device 10 in that the first portion 46a has a structure in which a third portion 74 in which a plurality of first through-holes 42 are provided in a staggered pattern and a fourth portion 76 in which a plurality of first through-holes 42 are not provided are alternately arranged in the winding direction. The following description will focus on the differences from the display device 10.

[0060] Fig. 9 is a diagram showing a cross section of a display device 10a and a connecting member 20a according to embodiment 2. Fig. 9(a) shows the cross section of the display device 10a, and Fig. 9(b) shows the connecting member 20a.

[0061] As shown in FIG. 9, the display device 10a mainly differs from the display device 10 in that it has a connecting member 20a instead of the connecting member 20, and the connecting member 20a has a plate-shaped member 40a instead of the plate-shaped member 40.

[0062] The plate-like member 40a has a first portion 46a and a second portion 48. The first portion 46a has a plurality of third portions 74 in which a plurality of first through holes 42 are provided, and a plurality of fourth portions 76 in which a plurality of first through holes 42 are not provided, and the third portions 74 and the fourth portions 76 are alternately arranged in the winding direction. The third portions 74 have a plurality of first through holes 42 provided in a staggered pattern.

[0063] When the dimension of the third part 74 in the winding direction is A and the dimension of the fourth part 76 in the winding direction is B, A < B. In Embodiment 2, (A / B) = (0.8 / 1). For example, the dimension of the third part 74 in the winding direction is the dimension from the front end of the foremost first through-hole 42 to the rear end of the rearmost first through-hole 42 among the plurality of first through-holes 42 provided in the third part 74 in the winding direction. Also, for example, the dimension of the fourth part 76 in the winding direction is the dimension from the rear end of the rearmost first through-hole 42 among the plurality of first through-holes 42 provided in the third part 74 adjacent to the fourth part 76 on the front side in the winding direction to the front end of the foremost first through-hole 42 among the plurality of first through-holes 42 provided in the third part 74 adjacent to the fourth part 76 on the rear side in the winding direction. Also, for example, the dimension of the fourth part 76 in the winding direction is the dimension from the rear end of the rearmost second through-hole 44 among the plurality of second through-holes 44 provided in the second part 48 adjacent to the fourth part 76 on the front side in the winding direction to the front end of the foremost first through-hole 42 among the plurality of first through-holes 42 provided in the third part 74 adjacent to the fourth part 76 on the rear side in the winding direction.

[0064] Note that A < B is not necessary. For example, A ≥ B may be satisfied, T1 (see (a) of FIG. 5) < B may be satisfied, and W1 (see (a) of FIG. 5) < B may be satisfied.

[0065] When the radius of the main body 52 is R, the pi is π, one set consists of one third part 74 and one fourth part 76 adjacent to the one third part 74, and the number of such sets per one turn in the state where the plate-like member 40a is wound around the core material 24 is n, (1 - (A + B)×n / 2×π×R) ≤ 0.2 is satisfied.

[0066] FIG. 10 is a view showing another example of the connecting member 78 used in the experiment for obtaining the elongation rate. FIG. 11 is a view showing the result of the experiment for obtaining the elongation rate using the connecting member 78 of FIG. 10. In (a) of FIG. 10, the illustration of the through-hole 84 is omitted in order to avoid complication of the drawing.

[0067] 10, the dimension of the connecting member 78 in the winding direction is 245 [mm], the dimension in the perpendicular direction is 321.9 [mm], the dimension in the thickness direction of the connecting member 78 is 0.2 [mm], and the connecting member 78 is made of SUS301. No through hole is formed in a portion 80 of the connecting member 78 from the front end to the rear end 9.2 [mm] in the winding direction, and a through hole is formed in a portion 82 of the connecting member 78 from the rear end to the front end 10.3 [mm] in the winding direction. No through holes are formed in the portion 80. Between the portion 80 and the portion 82, a portion 86 in which a plurality of through holes 84 are provided in a staggered pattern and a portion 88 in which no through holes are provided are alternately arranged. The dimension of each of the plurality of through holes 84 in the orthogonal direction is 0.5 mm. Orthogonal The dimension between every two adjacent through holes 84 in the winding direction is 0.1 [mm]. The dimension of each of the multiple through holes 84 in the winding direction is 0.2 [mm], and the dimension between every two adjacent through holes 84 among the multiple through holes 84 in the winding direction is 0.1 [mm].

[0068] 10 and 11, when A=1.4[mm] and B=5[mm], when a load of 0[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 0[%], and when a load of 200[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 0.4[%]. In this case, when a load of 600[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 1.3[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 2.2[%].

[0069] When A=1.4[mm] and B=2[mm], when a load of 0[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 0[%], and when a load of 200[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 2.7[%]. In this case, when a load of 600[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 5.3[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 7.5[%].

[0070] When A=0.8[mm] and B=2[mm], when a load of 0[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 0[%], and when a load of 200[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 1.8[%]. In this case, when a load of 600[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 4.0[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 5.3[%].

[0071] When A=0.8[mm] and B=1[mm], when a load of 0[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 0[%], and when a load of 200[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 1.6[%]. In this case, when a load of 600[g] was applied to the connecting member 78 in the winding direction, the elongation rate of the connecting member 78 in the winding direction was 4.0[%], and when a load of 1000[g] was applied, the elongation rate of the connecting member 78 in the winding direction was 6.0[%].

[0072] In the above-described connecting member 20a, since (A / B) = (0.8 / 1), in the winding direction, the first portion 46a can be moderately stretched. Further, while there are limitations on the plate thickness of the plate-like member 40a for ensuring the required strength and the workability of the plurality of first through-holes 42, etc., a high elongation rate and lateral rigidity (torsion suppression) can be ensured such that the periods of the third portion 74 and the fourth portion 76 are less likely to be reflected as irregularities on the surface of the display panel 12. Also, the adhesion area between the connecting member 20a and the display panel 12 can be increased, and the connecting member 20a and the display panel 12 can be made less likely to peel off.

[0073] The display device 10a has been described above.

[0074] In the display device 10a according to the second embodiment, the first portion 46a has a plurality of third portions 74 where a plurality of first through-holes 42 are provided, and a plurality of fourth portions 76 where no first through-holes 42 are provided. The third portions 74 and the fourth portions 76 are alternately arranged in the winding direction. When the dimension of the third portion 74 in the winding direction is A and the dimension of the fourth portion 76 in the winding direction is B, A < B is satisfied.

[0075] According to this, by providing the fourth portion 76, the adhesion area between the connecting member 20a and the display panel 12 can be increased, and the adhesive force can be increased. Therefore, it is possible to suppress the connecting member 20a from coming off the display panel 12 and suppress a decrease in quality.

[0076] Also, in the display device 10a according to the second embodiment, (A / B) = (0.8 / 1) is satisfied.

[0077] According to this, referring to the above-described experimental results, by satisfying (A / B) = (0.8 / 1), in the winding direction, the first portion 46a can be moderately stretched.

[0078] Furthermore, in the display device 10a of embodiment 2, when the radius of the core material 24 is R, pi is the circular constant, one third portion 74 and one fourth portion 76 are one set, and the number of such sets per revolution when the plate-like member 40a is wound around the core material 24 is n, the relationship (1-(A+B)×n / 2×π×R)≦0.2 is satisfied.

[0079] This makes it possible to increase the adhesive area between the connecting member 20a and the display panel 12 while preventing the display panel 12 from becoming difficult to roll up, thereby increasing the adhesive strength.

[0080] (Embodiment 3) A display device 10b according to the third embodiment will be described with reference to Fig. 12. The display device 10b differs from the display device 10 mainly in that the main body 52b of the core material 24b has a step portion 90. The following description will focus on the differences from the display device 10.

[0081] FIG. 12 is a cross-sectional view showing a display device 10b according to the third embodiment.

[0082] As shown in FIG. 12, a display device 10b differs from the display device 10 mainly in that a core material 24b is provided instead of the core material 24.

[0083] The core 24b has a main body 52b and a through-hole 54b. 1 The outer circumferential surface of the main body 52b has a stepped portion 90 that is recessed inward. The dimension (depth) of the stepped portion 90 in the radial direction of the main body 52b is the sum of the dimension of the plate-like member 40 in the thickness direction and the dimension of the protective member 22 in the thickness direction.

[0084] The plate-shaped member 40 is fixed to the step portion 90. The plate-shaped member 40 and the protective member 22 are fixed to the step portion 90 so as not to protrude from the step portion 90 in the radial direction of the main body 52b.

[0085] The display device 10b has been described above.

[0086] In a display device 10b according to the third embodiment, a core material 24b has a step portion 90 recessed inward on the outer circumferential surface of the core material 24b, and a plate-shaped member 40 is fixed to the step portion 90.

[0087] This prevents the plate-like member 40 fixed to the core material 24b from protruding outward beyond the core material 24b in the radial direction of the core material 24b, thereby further preventing the display panel 12 from becoming difficult to roll up and also prevents the display panel 12 from being damaged and thus prevents a deterioration in quality.

[0088] (Embodiment 4) A display device 10c according to a fourth embodiment will be described with reference to Fig. 13. The display device 10c differs from the display device 10 mainly in that a connecting member 20c is fixed to a main body 52c inside the main body 52c. The following description will focus on the differences from the display device 10.

[0089] Fig. 13 is a diagram showing a cross section of a display device 10c and a connecting member 20c according to embodiment 4. Fig. 13(a) shows the cross section of the display device 10c, and Fig. 13(b) shows the connecting member 20c.

[0090] As shown in FIG. 13, display device 10c mainly differs from display device 10 in that it has connecting member 20c instead of connecting member 20, and has core material 24c instead of core material 24, and connecting member 20c has plate-shaped member 40c instead of plate-shaped member 40.

[0091] The core 24c has a main body 52c and a through-hole 54c. 1 The through portion 54c penetrates the main body 52c in the radial direction of the main body 52c and extends in the axial direction of the main body 52c.

[0092] The plate-like member 40c has a fifth portion 92 that protrudes from the front end of the second portion 48 in the winding direction toward the inside of the main body 52c. The fifth portion 92 and the flexible substrate 16 are inserted through the through-hole 54c. The fifth portion 92 and the drive substrate 14 are stacked on top of each other and fixed to the main body 52c inside the main body 52c.

[0093] The display device 10c has been described above.

[0094] Embodiment 4 In the display device 10c relating to the above, the core material 24c has a cylindrical main body 52c and a through-hole 54c that penetrates the main body 52c in the radial direction of the main body 52c, the flexible substrate 16 and the plate-like member 40c are inserted into the through-hole 54c, and the drive substrate 14 and the plate-like member 40c are stacked on top of each other and fixed to the main body 52c inside the main body 52c.

[0095] According to this, since there is no need to fix the plate-like member 40c to the outer peripheral surface of the main body 52c, it is possible to further prevent the display panel 12 from becoming difficult to roll up.

[0096] (Other embodiments, etc.) Although the display device according to the present disclosure has been described above based on the embodiment, the present disclosure is not limited to the above embodiment. The present disclosure also includes modifications obtained by applying various modifications conceived by a person skilled in the art to the above embodiment without departing from the spirit of the present disclosure, and various devices incorporating a display panel according to the present disclosure. [Industrial Applicability]

[0097] A display device according to the present disclosure can be used in digital televisions, digital signage, smartphones, tablet terminals, wearable terminals, and the like. [Explanation of symbols]

[0098] 10,10a,10b,10c Display device 12 Display Panel 14 Drive board 16 Flexible PCB 18 Optical adhesive sheet 20, 20a, 20c, 64, 78 Connecting member 22 Protective materials 24, 24b, 24c Core material 26 Pantograph section 28 Motor 30 Cover Window 32 Optical adhesive sheet 34 Circular polarizer 36 Optical adhesive sheet 38 OLED panels 40, 40a, 40c Plate-shaped member 42 First through hole 44 Second Through Hole 46,46a Part 1 48 Part 2 50 boundaries 52, 52b, 52c Main unit 54,54b,54c Penetration part 56 First support member 58 Second support member 60 First arm section 62 Second Arm Section 66,68,70,80,82,86,88 part 72,84 Through holes 74 Part 3 76 Part 4 90 Step 92 Part 5

Claims

1. A flexible display panel; A driving substrate for driving the display panel; a flexible substrate that connects the display panel and the driving substrate and has flexibility; a core member to which the driving substrate is fixed and which is used to wind up the display panel and the flexible substrate; a connecting member having a plate-like member that is laminated on the display panel, connects the display panel and the core material, and is wound up around the core material together with the display panel and the flexible substrate, the plate-like member has a first portion that overlaps with the display panel and curves when the display panel is wound around the core material, and a second portion that overlaps with the flexible substrate and curves when the flexible substrate is wound around the core material, an elongation rate of the second portion in a winding direction of the plate-like member is smaller than an elongation rate of the first portion; the connecting member has a plurality of first through holes arranged in a staggered pattern in the first portion and a plurality of second through holes arranged in a staggered pattern in the second portion, wherein when a dimension of each of the plurality of first through holes in an orthogonal direction perpendicular to a thickness direction of the plate-like member and perpendicular to the winding direction is L1, a dimension between each two first through holes adjacent to each other in the orthogonal direction among the plurality of first through holes is S1, a dimension of each of the plurality of second through holes in the orthogonal direction is L2, and a dimension between each two second through holes adjacent to each other in the orthogonal direction among the plurality of second through holes is S2, then (L1 / S1)>(L2 / S2) is satisfied, the first portion includes a plurality of third portions in which the plurality of first through holes are provided, and a plurality of fourth portions in which the plurality of first through holes are not provided, the third and fourth portions are interleaved in the winding direction; When a dimension of the third portion in the winding direction is A and a dimension of the fourth portion in the winding direction is B, A<B is satisfied. Display device.

2. The second portion is adhered to the display panel. The display device according to claim 1 .

3. (L1 / S1)=(3 / 0.1) is satisfied, (L2 / S2)=(1 / 0.1) is satisfied. The display device according to claim 1 .

4. (A / B)=(0.8 / 1) is satisfied. The display device according to claim 1 .

5. When the radius of the core material is R, pi is the circular constant, one third portion and one fourth portion are one set, and the number of the one set per one revolution in a state in which the plate-like member is wound around the core material is n, (1-(A+B)×n / 2×π×R)≦0.2 is satisfied. The display device according to claim 1 .

6. The core material has a step portion recessed inward on an outer circumferential surface of the core material, The plate-like member is fixed to the step portion. The display device according to claim 1 .

7. The core material has a cylindrical main body and a through-portion that passes through the main body in a radial direction of the main body, the flexible substrate and the plate-like member are inserted through the through-hole, the driving substrate and the plate-like member are stacked on each other and fixed to the main body inside the main body; The display device according to claim 1 .

Images