Indicating device

Abstract

To provide a rollable display device that can be miniaturized and can realize a free-stop type. 【Solution means】The display device 10 includes a first shaft 12 and a second shaft 14 arranged in parallel, a sheet body 16 wound around the first shaft 12 and the second shaft 14, a first constant load spring 18A that biases the first shaft 12 in the direction in which the sheet body 16 is wound, a second constant load spring 18B that biases the second shaft 14 in the direction in which the sheet body 16 is wound, and an OLED 46 that is wound around the first shaft 12 in a stacked state with the sheet body 16 when the sheet body 16 is wound around the first shaft 12 and is unwound from between the first shaft 12 and the second shaft 14 when the sheet body 16 is unwound from the first shaft 12 to the second shaft 14. The unwinding of the OLED 46 stops at an arbitrary position based on the torque generated by the first constant load spring 18A and the second constant load spring 18B.

Description

Technical Field

[0001] The present invention relates to a retractable display device.

Background Art

[0002] Patent Document 1 discloses a retractable display device. In this display device, a display unit is wound and stored inside a stationary housing, and the display unit is moved up and down under the action of a motor using a link mechanism.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Although a retractable display device can be stored in a small area and volume, the display device of Patent Document 1 has a power mechanism such as a link mechanism and a motor, so it is large as a whole. In addition, if a retractable display device is made a free-stop type that can maintain an arbitrary amount of unwinding by taking advantage of its characteristics, its applications will expand.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a retractable display device that can be miniaturized and can realize a free-stop type.

Means for Solving the Problems

[0006] In order to solve the above-described problems and achieve the object, a display device according to an aspect of the present invention includes a first axis and a second axis arranged in parallel, a sheet body wound around the first axis and the second axis, a first constant load spring that biases the first axis in a direction in which the sheet body is wound, a second constant load spring that biases the second axis in a direction in which the sheet body is wound, and an OLED that is wound around the first axis in a stacked state with the sheet body when the sheet body is wound around the first axis and is unwound from between the first axis and the second axis when the sheet body is unwound from the first axis to the second axis.

Effect of the Invention

[0007] The display device according to the present invention can be miniaturized and can realize a free-stop type.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 10

Figure 11

[0009] Hereinafter, embodiments of a display device according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by these embodiments.

[0010] FIG. 1 is a schematic perspective view of a display device 10 according to an embodiment of the present invention, in a state where a flexible display body 22 including an OLED 46 is pulled out by a predetermined amount. FIG. 2 is a schematic perspective view of the display device 10 in a state where the flexible display body 22 is stored.

[0011] The display device 10 includes a first shaft 12 and a second shaft 14 arranged in parallel, a sheet body 16 wound around the first shaft 12 and the second shaft 14, a first constant load spring 18A, a second constant load spring 18B, and a flexible display body 22. The flexible display body 22 can be wound up and unwound with respect to the first shaft 12. The first shaft 12 and the second shaft 14 have a circular cross section, but they do not necessarily have to be circular. Although not shown, the display device 10 includes a cover that covers the first shaft 12, the second shaft 14, the first constant load spring 18A, and the second constant load spring 18B. The flexible display body 22 is wound up and unwound through a slit formed on the upper surface of the cover.

[0012] In each figure, the axial directions of the first axis 12 and the second axis 14 are appropriately shown as the X direction, and the unwinding and extending direction of the flexible display body 22 from the first axis 12 is shown as the Y direction. The Y direction is slightly inclined with respect to the vertical direction, and in this embodiment, the angle θ formed between the Y direction and the vertical direction is about 15°. The X direction and the Y direction are orthogonal. The side of the display surface of the flexible display body 22 is the front, and the side of the non-display surface is the rear. When the display device 10 is placed on a desk, the display surface of the flexible display body 22 is approximately face-to-face with the user's face. However, as a usage mode of the display device 10, it is not necessarily required to be placed on a desk, and it can be used as a handy device such as a tablet terminal, for example.

[0013] The X widths of the first axis 12 and the second axis 14 are moderately longer than the flexible display body 22 and are pivotally supported by the left and right side plates 24a and 24b. The side plates 24a and 24b are erected from both ends of the plate 26. The second axis 14 is located moderately above and slightly behind the first axis 12, and the common tangent direction connecting the rear surface of the first axis 12 and the front surface of the second axis 14 coincides with the Y direction.

[0014] A control unit 28 is provided in the hollow portion of the first axis 12. The display device 10 can be connected to an external device 30 by wire or wirelessly. Examples of the external device 30 include a keyboard 30a, a mouse 30b, an IO port 30c, a battery 30d, a personal computer 30e, and the like. By connecting the personal computer 30e to the display device 10, it becomes a dual monitor specification. The power of the display device 10 is supplied by a primary battery, a secondary battery, or commercial alternating current power. A sensor for detecting the amount of rotation of the first axis 12 may be provided and read by the control unit 28.

[0015] The sheet body 16 is made of a fabric such as nylon, is flexible, has an appropriate tensile strength, and has little elongation. The sheet body 16 is wound around the flexible display body 22 in a laminated state with respect to the first axis 12, extending from the rear surface of the first axis 12 to the front surface of the second axis 14, and is wound around the second axis 14 separately from the flexible display body 22. Therefore, when the second axis 14 rotates clockwise in FIGS. 1 and 2, the sheet body 16 is wound around the second axis 14, and the first axis 12 rotates counterclockwise to unwind the sheet body 16. Conversely, when the first axis 12 rotates clockwise, the sheet body 16 is wound around the first axis 12, and the second axis 14 rotates counterclockwise to unwind the sheet body 16. The flexible display body 22 is supported at both ends by a strip material 52 described later and is maintained upright linearly. However, the sheet body 16 supports the rear surface of the flexible display body 22 in a relatively large area between the two strip materials 52, further stabilizing the self-standing state.

[0016] The first axis 12 is provided with a first constant load spring 18A that biases the first axis 12 in the direction of winding the sheet body 16, that is, the clockwise direction in FIGS. 1 and 2. The second axis 14 is provided with a second constant load spring 18B that biases the second axis 14 in the direction of winding the sheet body 16, that is, the clockwise direction in FIGS. 1 and 2. The first constant load spring 18A and the second constant load spring 18B are also typically referred to as the constant load spring 18. Since the first axis 12 and the second axis 14 are each biased in the direction of winding the sheet body 16 by the constant load spring 18, an appropriate tension is generated in the sheet body 16 and it does not bend. Also, the sheet body 16 acts such that when one of the first axis 12 and the second axis 14 winds, the other unwinds, and when one unwinds, the other also unwinds.

[0017] The first constant load spring 18A and the second constant load spring 18B are each located between the flexible display body 22 and the side plate 24a and are arranged side by side in the front-rear direction. The first constant load spring 18A and the second constant load spring 18B may be arranged separately on the left and right sides of the flexible display body 22.

[0018] FIG. 3 is a schematic perspective view of the constant load spring 18. In FIG. 3, a part is shown by a phantom line. The constant load spring 18 will be described with reference to FIGS. 1, 2, and 3. The constant load spring 18 is provided at the right end portions of the first shaft 12 and the second shaft 14. The constant load spring 18 has an elastic band 34, a first pulley 36, and a second pulley 38. The first pulley 36 of the first constant load spring 18A is provided on the first shaft 12, and the first pulley 36 of the second constant load spring 18B is provided on the second shaft 14. The second pulley 38 is pivotally supported by a pulley shaft 38a. The pulley shaft 38a is pivotally supported by the side plate 24a. In the first constant load spring 18A, the pulley shaft 38a is above the first shaft 12, and in the second constant load spring 18B, the pulley shaft 38a is below the second shaft 14, achieving a good layout balance.

[0019] The elastic band 34 is a metal spring material having a bending elasticity such that it coils in a natural state, similar to a so-called spiral spring. The elastic band 34 hardly extends in the tensile direction. The first pulley 36 is wound in a direction opposite to the direction in which the elastic band 34 coils in a natural state. The second pulley 38 winds up the elastic band 34 unwound from the first pulley 36 in the natural coiling direction. Such a constant load spring 18 always exerts a constant elastic force regardless of the amount of unwinding of the elastic band 34 and applies a rotational force to the first pulley 36.

[0020] FIG. 4 is a partially enlarged exploded perspective view of the flexible display body 22. FIG. 5 is a schematic perspective view of a part of the display device 10 as seen obliquely from behind. FIG. 6 is a schematic cross-sectional view of the flexible display body 22. FIG. 7 is a view showing the backsheet 50. The inside of the circle in FIG. 7 is a partially enlarged view of the backsheet 50. The flexible display body 22 is a laminate in which a polyimide sheet 40, a polarizing sheet 42, a touch sensor 44, an OLED (Organic Light Emitting Display) 46, a PET (Polyethylene Terephthalate) sheet 48, and a backsheet 50 are fixed by an adhesive tape or the like. Among these, the touch sensor 44 and the like may be omitted depending on the design conditions. The OLED 46 has characteristics of being thin, lightweight, low power consumption, and excellent in contrast and responsiveness. Further, since the OLED 46 is flexible, it can be wound up, but it has relatively strong bending elasticity and has a property of returning to a flat shape without an external force. In this embodiment, the size of the OLED 46 is, for example, about 30 inches. The front side of the OLED 46 is the display surface and the rear side is the non-display surface in FIG. 1.

[0021] The backsheet 50 is attached to the rear side of the flexible display body 22, that is, the non-display surface side of the OLED 46. In FIG. 4, the backsheet 50 of the flexible display body 22 is explicitly shown separated. The backsheet 50 is made of a material that is moderately hard and thin, for example, a stainless steel material with a thickness of 150 μm. A large number of long holes 50a that are long in the X direction are formed almost entirely on the backsheet 50. The long holes 50a are arranged in the X direction and form a plurality of rows in the Y direction. The long holes 50a are arranged alternately in the X direction between adjacent rows. Such a backsheet 50 has a property of expanding and contracting in the Y direction, is easy to wind up with respect to the first axis 12, and is strong in the X direction.

[0022] When the flexible display 22 is stored alone in a wound state with respect to the first axis 12 for a long time, it has been confirmed that it tends to develop a bending habit in an arc shape convex backward as shown by the phantom line in FIG. 4. This phenomenon is considered to occur because when trying to flatten the OLED 46, the film on the outermost surface is pulled up and down, causing it to shrink slightly in the left - right direction. The backsheet 50 can prevent this winding habit and keep the flexible display 22 almost flat.

[0023] A pair of strip materials 52 are provided over almost the entire length in the Y - direction at both ends of the flexible display 22. The strip materials 52 are slightly separated from the flexible display 22. The gap 54 between the strip material 52 and the flexible display 22 is, for example, about 1 mm. The strip material 52 has an arc - shaped cross - section similar to a metal tape measure called a convex, and can be wound together with the flexible display 22 with respect to the first axis 12, and can keep the flexible display 22 in a straight line when unwound. In FIG. 1, the strip material 52 has an arc shape convex backward.

[0024] The flexible display 22 and the strip material 52 are fixed by a plurality of fixing materials 56. The fixing material 56 is a slightly horizontally long and thin adhesive material, and a plurality of sheets are provided across the space between the flexible display 22 and the strip material 52 with a narrow interval in the Y - direction. The number of fixing materials 56 is about 10 on each of the left and right sides of the flexible display 22. The fixing material 56 is strong against tension in the X - direction but can expand and contract in the Y - direction, and is, for example, a fabric gum tape. Since the expansion and contraction of each fixing material 56 do not completely follow the expansion and contraction of the backsheet 50, it is better that the width in the Y - direction is as narrow as possible. That is, the fixing material 56 is divided into a plurality of sheets rather than providing a single long sheet in the Y - direction, so that it can expand and contract more easily as a whole in the Y - direction. Therefore, the back surface of the flexible display 22 can absorb the expansion and contraction in the Y - direction when unwinding and winding, and does not distort the flexible display 22.

[0025] An operation bar 58 is fixed to the upper ends of the flexible display body 22 and the strip material 52. The operation bar 58 has a shape and thickness that are easy to grip by hand. The flexible display body 22 unwound from the first shaft 12 (see FIG. 1) is surrounded in a frame shape on all four sides by the left and right strip materials 52, the upper operation bar 58, and the lower first shaft and is maintained in a planar shape. The operation bar 58 abuts against the upper surface of the cover when the flexible display body 22 is wound up, and functions as a stopper to prevent excessive winding around the first shaft 12. Note that, as a stopper when the flexible display body 22 is unwound, for example, an arm that decelerates and interlocks with the first shaft 12 may abut against the upper surface of the plate 26 to limit the movement. Such a stopper mechanism is also applicable when winding up.

[0026] As shown in FIG. 6, the flexible display body 22 is a laminate composed of a polyimide sheet 40, a polarizing sheet 42, a touch sensor 44, an OLED 46, a PET sheet 48, and a back sheet 50. When wound around the first shaft 12, a deviation in length L occurs at the end due to the path difference between the inner circumference and the outer circumference. If this deviation is excessive, delamination between layers may occur. The length L is determined by the number of winding turns of the flexible display body 22 around the first shaft 12. If the first shaft 12 has a large diameter and the number of winding turns is reduced, the length L can be reduced, but the size will increase accordingly. In order to make the length L practically small enough to prevent delamination between layers, it is appropriate to set the number of winding turns of the flexible display body 22 to 3 turns or less. Also, if the first shaft 12 has a small diameter, the first constant load spring 18A for winding has to be made larger. Due to these conditions, in this embodiment, although the winding length of the flexible display body 22 is about 340 mm, the diameter of the first shaft 12 is 40 mm (radius r1 = 20 mm in FIG. 8), and the number of winding turns is 2.7 turns.

[0027] Incidentally, as described above, the OLED 46 of the flexible display body 22 has a property of returning to a flat state if there is no external force. The strip material 52 also has the same property. Therefore, it is difficult to wind the flexible display body 22 and the strip material 52 around the first axis 12 as they are. Although it is conceivable to provide a cylinder around the first axis 12 so that the flexible display body 22 and the strip material 52 do not spread, a large friction occurs between the flexible display body 22 that tries to spread and the cylinder, and a large force is required for unwinding and winding.

[0028] In the display device 10 according to the present embodiment, the sheet body 16 wound around the first axis 12 and the second axis 14 is applied with an appropriate tension by the first constant load spring 18A and the second constant load spring 18B. The flexible display body 22 including the OLED 46 is wound around the first axis 12 in a laminated state with the sheet body 16, and is unwound from between the first axis 12 and the second axis 14 as the sheet body 16 is unwound from the first axis 12 to the second axis 14. Therefore, since the force that the OLED 46 tries to return to a flat state is corrected by the sheet body 16, it does not spread and can be wound around the first axis 12 almost without a gap together with the sheet body 16.

[0029] The second axis 14 has a function of supporting the rear surface of the flexible display body 22. In order to stably support the flexible display body 22, it is desirable that the axial distance between the first axis 12 and the second axis 14 is separated to a certain extent. For example, it is separated by about 1 to 2 times the diameter of the first axis 12. Since there is a sheet body 16 that synchronously displaces with the flexible display body 22 between the second axis 14 and the flexible display body 22, the flexible display body 22 does not make sliding contact with the second axis 14.

[0030] The flexible display body 22 is of a self-standing type that is maintained in an upright state by the strip material 52 by gripping and lifting the operation bar 58 upward. Further, the unwinding of the flexible display body 22 is of a free-stop type that stops at an arbitrary position based on the torque generated by the first constant-load spring 18A and the second constant-load spring 18B. More specifically, since the force due to the bending rigidity of the OLED 46 and the frictional force act on the sheet body 16, the first constant-load spring 18A and the second constant-load spring 18B are set in consideration of these factors.

[0031] FIG. 8 is a schematic cross-sectional side view of the display device 10. Further explanation will be made with reference to FIG. 8. T1 is the clockwise torque applied to the first shaft 12 by the first constant-load spring 18A. T2 is the clockwise torque applied to the second shaft 14 by the second constant-load spring 18B. r1 is the radius of the first shaft 12. r2 is the radius of the second shaft 14. F1 is the downward force applied by the first shaft 12 to the sheet body 16, and F1 = T1 / r1. F2 is the upward force applied by the second shaft 14 to the sheet body 16, and F2 = T2 / r2. F3 is the upward force resulting from the property that the OLED 46 and the strip material 52 tend to return to a planar state, and is approximately constant in magnitude like the constant-load spring 18. F3 is sufficiently small compared to F1 and F2.

[0032] As described above, the radius r1 of the first shaft 12 is determined by conditions such as the number of winding turns of the flexible display body 22. Further, F1 is determined by the force required to wind the flexible display body 22 around the first shaft 12 without any gap. Then, T1 is determined as F1 × r1, and the first constant load spring 18A is selected based on the T1. The torque generated by the constant load spring 18 is determined by the width of the elastic band 34 (see FIG. 3), etc. In order to make the flexible display body 22 a free stop type, it is balanced as F1 = F2 + F3. Since F3 is a substantially constant value as described above, F2 is determined as F2 = F1 - F3. Since T2 = F2 × r2, if the radius r2 of the second shaft 14 is reduced, the torque T2 required for the second constant load spring 18B is also reduced. That is, it is preferable that the second shaft 14 has a smaller diameter and the second constant load spring 18B can be miniaturized. In the display device 10, the second shaft 14 has a smaller diameter than the first shaft 12, and the second constant load spring 18B is miniaturized.

[0033] In the display device 10, although it is balanced as F1 = F2 + F3, in reality, it does not achieve a perfect balance due to individual differences, etc., and the flexible display body 22 stops at an arbitrary position due to small frictional forces of each part. This small frictional force can occur naturally, for example, between the first shaft 12 and the side plates 24a, 24b, but an intentional frictional element may be provided separately. The torque generated by the intentionally provided frictional element is sufficiently small compared to the above torques T1, T2. A bearing may be provided between the first shaft 12 and the side plates 24a, 24b.

[0034] The flexible display body 22 is wound around the first shaft 12 together with the sheet body 16 by gripping and pushing down the operation bar 58. In terms of design, since the first constant load spring 18A and the second constant load spring 18B are balanced, the user can perform the unwinding and winding of the flexible display body 22 with a sufficiently small force. The force required for the unwinding and winding of the flexible display body 22 is substantially constant regardless of the amount of unwinding.

[0035] According to the strip 52, it is also possible to maintain the flexible display body 22 in a state where it is pulled out horizontally. In the case of a specification in which the flexible display body 22 is pulled out downward, the strip 52 may be omitted.

[0036] In the display device 10, since the tension of F2 is constantly applied to the sheet body 16, it is possible to wind up and unwind while preventing the flexible display body 22 from recovering flat. Further, thereby, the back surface of the flexible display body 22 is supported, and a complicated structure such as a link for self-standing other than the strip 52 becomes unnecessary, and weight reduction is achieved.

[0037] The display device 10 can reduce the substantial volume by winding up the flexible display body 22 around the first shaft 12 and store it, and moreover, a power mechanism such as a link mechanism and a motor is unnecessary. Therefore, it can be miniaturized and is suitable for mobile applications. However, depending on the specification, it may be automated using a motor.

[0038] FIG. 9 is a schematic cross-sectional side view of a display device 10A according to a first modification. In the above-described display device 10, the sheet body 16 is wound around from the rear surface of the first shaft 12 to the front surface of the second shaft 14 in the state shown in FIG. 8, and the first shaft 12 and the second shaft 14 are each biased in the clockwise direction. However, in the display device 10A, the sheet body 16 is wound around from the rear surface of the first shaft 12 to the rear surface of the second shaft 14, and the first shaft 12 is biased in the clockwise direction and the second shaft 14 is biased in the counterclockwise direction.

[0039] That is, the first constant load spring 18A biases the first shaft 12 in the direction in which the sheet body 16 is wound up, the second constant load spring 18B biases the second shaft 14 in the direction in which the sheet body 16 is wound up, and the sheet body 16 is wound up by one of the first shaft 12 and the second shaft 14 and the other is unwound, and it may be configured such that the other is unwound by the unwinding of one. In the display device 10A, the back surface of the flexible display body 22 is supported by the idle roller 60. In the example of FIG. 9, two idle rollers 60 are provided slightly separated in the Y direction, but one or three or more may be used.

[0040] FIG. 10 is a schematic cross-sectional side view of the display device 10B according to the second modification. FIG. 11 is a schematic perspective view of the display device 10B. In the display device 10B, the second axis 14 is arranged in front of the first axis 12, and the sheet body 16 is wound so as to extend from the lower surface of the first axis 12 to the upper surface of the second axis 14. The display device 10B has a housing cover 62, and the first axis 12 and the second axis 14 are covered. In FIG. 11, the constant load spring 18 and the like are omitted.

[0041] In the display device 10B, the winding directions of the flexible display body 22 and the sheet body 16 with respect to the first axis 12 and the second axis 14 are opposite to those of the display device 10. Therefore, the directions of the torques T1 and T2 with respect to the first axis 12 and the second axis 14 are also opposite, and are counterclockwise, respectively.

[0042] In the above example (see FIG. 8), the flexible display body 22 extends from the rear surface of the first axis 12, whereas in the display device 10B, it extends from the front surface. The flexible display body 22 extends in the Y direction from a slit 64 formed in the housing cover 62. The slit 64 is formed between an upper wall 66 that covers above the first axis 12 and a support piece 68 that supports the flexible display body 22 in the front.

[0043] The support piece 68 is in an obliquely forward position when viewed from the first axis 12 and has an appropriate width in the Y direction. There are a pair of support pieces 68 on the left and right, each of which abuts against the front surface of the strip material 52 to support the self-standing, and the flexible display body 22 does not fall forward. The slits 64 are formed on the left and right corresponding to the support pieces 68. The contact surface of the support piece 68 with respect to the strip material 52 is preferably an arc surface that conforms to the shape of the strip material 52.

[0044] Since the support piece 68 supports only the strip material 52, it does not block the display portion of the flexible front body 22. That is, the rectangular region 70 (indicated by the phantom line) between the left and right support pieces 68 can be effectively utilized as the display region, and it can be used as a display up to the vicinity of the rotation center of the first axis 12. Depending on the conditions, a transparent plate may be provided in the rectangular region 68 to more reliably support the flexible display body 22. Further, if necessary, an idle roller 60 as shown in FIG. 9 may be appropriately provided to adjust or support the orientation of the flexible display body 22. As shown by the phantom line in FIG. 10, the inclination angle of the support piece 68 may be variable.

[0045] In the example shown in FIG. 8, the forces F1, F2, and F3 indicating the forces are on a straight line and can be substantially treated as scalar quantities. However, in the examples shown in FIGS. 9 to 11, since the directions are different, they are different in that they are treated as vector quantities. For ease of comparison, the same reference symbols are used in each figure.

[0046] The present invention is not limited to the above-described embodiments, and it goes without saying that it can be freely changed without departing from the gist of the present invention.

Explanation of Reference Numerals

[0047] 10 Display device 12 First axis 14 Second axis 16 Sheet body 18A First constant load spring 18B Second constant load spring 22 Flexible display body 24a, 24b Side plates 26 Plate 28 Control unit 30 External device 34 Elastic band 36 First pulley 38 Second pulley 46 OLED 50 Backsheet 50a Long hole 52 Strip material 54 Gap 56 Fixing material 58 Operation bar

Claims

1. A first shaft and a second shaft arranged in parallel, a sheet body wound around the first shaft and the second shaft, a first constant load spring that biases the first shaft in the direction in which the sheet body is wound, a second constant load spring that biases the second shaft in the direction in which the sheet body is wound, an OLED that is wound around the first shaft in a laminated state with the sheet body when the sheet body is wound around the first shaft, and is unwound from between the first shaft and the second shaft when the sheet body is unwound from the first shaft to the second shaft, and having the unwinding of the OLED stops at an arbitrary position based on the torques generated by the first constant load spring and the second constant load spring. A display device characterized by the above.

2. In the display device according to Claim 1, the unwinding of the OLED stops at an arbitrary position in balance with the forces caused by the first constant load spring, the second constant load spring, the bending rigidity of the OLED, and friction. A display device characterized by the above.

3. In the display device according to Claim 1, it has strip members provided at both edges along the unwinding extension direction of the OLED, which can be wound together with the OLED around the first shaft and maintain the OLED in a linear state during unwinding. A display device characterized by the above.

4. In the display device according to Claim 3, a plurality of the OLEDs and the strip members are provided along the unwinding extension direction and are fixed by a fixing member that can expand and contract in the extension direction. A display device characterized by the above.

5. In the display device according to Claim 1, it has a backsheet in which a large number of elongated holes that are long in the axial direction of the first shaft and the second shaft are formed on substantially the entire surface, and the backsheet is attached to the non-display surface of the OLED. A display device characterized by the above.

6. In the display device according to Claim 1, the second shaft has a smaller diameter than the first shaft. A display device characterized by the above.

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