Display device

Abstract

A display device that can be used in various ways is provided. [Solution] The display device 10A has a flexible display 12 with an OLED 11 attached, a cylinder 14 that winds up the flexible display 12 from one end, a constant load spring that applies a winding force to the flexible display 12 around the cylinder 14, a strip 54 that is provided on both edges of the flexible display 12 along the unwinding extension direction, can be wound up together with the flexible display 12 around the cylinder 14 and maintains the flexible display 12 in a straight line when unwinding, and a fixing mechanism 24A that releases the flexible display 12 when the unwinding direction of the flexible display 12 is relatively along the winding direction relative to the cylinder 14, and fixes the flexible display 12 so that it cannot be wound up when it is relatively along the counter winding direction relative to the cylinder 14.

Description

[Technical field]

[0001] The present invention relates to a rollable display device. [Background technology]

[0002] Patent Document 1 discloses a rollable display device. In this display device, a display unit is rolled up and stored inside a stationary housing, and the display unit is raised and lowered by the action of a motor using a link mechanism. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-140162 A Summary of the Invention [Problem to be solved by the invention]

[0004] The device in Patent Document 1 is vertical and seems to be capable of adjusting the amount of elevation, but it is a stationary type and cannot be turned sideways. A rollable display device is preferable if it can be made small enough for mobile use or to be supported by a simple stand, and a portable display device is preferable if the display area can be changed and it can be used in both vertical and horizontal orientations, allowing it to be used in a variety of ways.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a display device that can be used in various modes. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, a display device according to an embodiment of the present invention includes an OLED, a winding body that winds up the OLED from one end, a constant load spring that applies a winding force to the winding body for the OLED, a strip that is provided on both edges of the OLED along the unwinding extension direction, can be wound up together with the OLED onto the winding body and maintains the OLED in a straight line when unwinding, and a fixing mechanism that releases the OLED when the unwinding direction of the OLED is relatively along the winding direction relative to the winding body, and fixes the OLED so that it cannot be wound up when the unwinding direction is relatively along the counter-winding direction relative to the winding body. Effect of the Invention

[0007] According to the above-described aspect of the present invention, the amount of unwinding of the OLED can be adjusted arbitrarily, and the OLED can be maintained in an arbitrary direction, enabling the OLED to be used in a variety of different ways. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a display device according to an embodiment of the present invention and its external device. [Diagram 2] FIG. 2 is a schematic cross-sectional side view of the display device according to the first embodiment. [Diagram 3] FIG. 3 is a schematic cross-sectional front view of the display device according to the first embodiment. [Figure 4] FIG. 4 is a schematic perspective view of a constant force spring. [Diagram 5] FIG. 5 is a schematic diagram of a flexible display. [Figure 6] FIG. 6 is a schematic cross-sectional side view of the display device when the flexible display body is unrolled. [Figure 7] FIG. 7 is a schematic cross-sectional side view of the display device when the flexible display body is released from its fixed state. [Figure 8] FIG. 8 is a schematic cross-sectional side view of the display device when the flexible display body is rolled up and stored. [Figure 9]FIG. 9 is a schematic diagram of a fixing mechanism according to a first modified example. [Figure 10] FIG. 10 is a schematic diagram of a fixing mechanism according to the second modified example. [Figure 11] FIG. 11 is a diagram showing an example of use of the display device according to the first embodiment, where (a) is a diagram showing a stored state, (b) is a diagram showing a state ready for use, (c) is a diagram showing a state in use, and (d) is a diagram showing a put away state. [Figure 12] FIG. 12 is a schematic cross-sectional side view of the display device according to the second embodiment in a released state of the flexible display body. [Figure 13] FIG. 13 is a schematic cross-sectional front view of the display device according to the second embodiment in a state in which the display device is pulled out a predetermined amount from the flexible display cover and fixed by the fixing mechanism. [Figure 14] FIG. 14 is a diagram showing an example of use of the display device according to the second embodiment, where (a) is a diagram showing an example of use in which the display device is held in one hand, and (b) is a diagram showing an example of use in which the display device is used with a flexible tripod. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a display device according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these preferred embodiments.

[0010] FIG. 1 is a schematic diagram showing a display device 10 according to an embodiment of the present invention and its external devices.

[0011] The display device 10 uses an OLED (Organic Light Emitting Display) 11 as a display. The OLED 11 is characterized by being thin and lightweight, having low power consumption, and excellent contrast and responsiveness. The OLED 11 is flexible and can be rolled up, but has a relatively strong bending elasticity and tends to return to a flat shape in the absence of an external force. As the display device 10, a display device 10A according to a first embodiment and a display device 10B according to a second embodiment will be described in order. In this embodiment, the size of the OLED 11 is, for example, about 20 inches or 30 inches.

[0012] First, a display device 10A according to a first embodiment will be described. Fig. 2 is a schematic cross-sectional side view of the display device 10A. Fig. 3 is a schematic cross-sectional front view of the display device 10A. Figs. 2 and 3 show a state in which the flexible display body 12 is pulled out a predetermined amount from the cover 18 and fixed by a fixing mechanism 24A.

[0013] The display device 10A has a flexible display 12, a cylinder (winding body) 14, a cover 18, a constant force spring 20, a fixing mechanism 24A, a pull-out bar 26, a control unit 28, and a display control unit 30. The flexible display 12 has an OLED 11 provided over almost the entire surface, and the flexible display 12 and the OLED 11 are essentially synonymous in terms of winding and unwinding. The cylinder 14 is cylindrical, and the flexible display 12 is wound around its surface from one end 12a. In the explanation of the display device 10A, the extension direction of the cylinder 14 is defined as the X direction. The cylinder 14 is cylindrical, and the X direction corresponds to the cylindrical axis direction of the cylinder 14. The constant force spring 20 side is defined as the X1 direction, and the opposite side is defined as the X2 direction. The unwinding and winding direction of the flexible display 12 is defined as the Y direction, and the cylinder 14 side is defined as the Y direction. 2 Direction, pull-out bar 26 side Y 1 2 and FIG. 7 described later, in order to express the relative circumferential direction, the direction along which the flexible display body 12 is wound around the cylinder 14 is referred to as the CW direction, and the opposite direction is referred to as the CCW direction.

[0014] A control unit 28 and a display control unit 30 are provided in the hollow portion 14a of the cylinder 14. The control unit 28 and the display control unit 30 have an elongated shape and are provided along the X direction. The control unit 28 and the display control unit 30 are connected by a control line.

[0015] The control unit 28 corresponds to a motherboard in a normal personal computer, and controls the entire display device 10A, and is connected to an external device via an interface cable 31. The interface cable 31 forms a spiral portion 31a so that the rotation of the cylinder 14 is not transmitted to the outside.

[0016] The external devices include a keyboard 32, a mouse 34, a communication port 36, and an external battery 38. These external devices are connected as needed, and may be disconnected when not needed. The control unit 28 may be outside the display device 10A. The battery may be inside the display device 10A.

[0017] The display control unit 30 controls the display of the OLED 11, and is, for example, a timing controller. A slit 14b (see FIG. 2) is formed in the cylinder 14, and one end 12a of the flexible display body 12 is connected to the display control unit 30 from the slit 14b via a plurality of display control lines 30a. From the viewpoint of the display timing in the horizontal direction, it is desirable to provide the display control unit 30 along the horizontal direction near one end 12a of the flexible display body 12, and a layout along the X direction within the hollow portion 14a is preferable.

[0018] The cover 18 is a cylindrical housing that covers the entire display device 10A, and both ends are closed with lids 18a and 18b. A power switch, a brightness adjustment switch for the OLED 11, etc. may be provided on the lids 18a and 18b. A bulge 18d for accommodating a constant force spring 20 is formed in the X1 direction of the cover 18. The cover 18 has a diameter somewhat larger than that of the cylinder 14, and a winding space 16 for the flexible display body 12 is secured between the cover 18 and the cylinder 14. The diameter of the cover 18 is about 30 mm in this embodiment.

[0019] A slit 18c (see FIG. 2) is formed in the cover 18, through which the flexible display body 12 is unwound. The other end 12b of the flexible display body 12 protrudes outside the slit 18c. A pull-out bar 26 is provided over the entire length of the other end 12b. The pull-out bar 26 is for holding the flexible display body 12 when unwinding it, and is made of, for example, stainless steel, and has a diameter that makes it easy to hold.

[0020] The X2 side end of the cylinder 14 is supported by a bearing 39. The bearing 39 has an outer ring 39a and an inner ring 39b. The inner ring 39b is fixed to the lid 18b. The outer ring 39a has the same diameter as a cylinder support part 42a described below, and is fixed to the inner wall of the cylinder 14 via a rubber ring 48.

[0021] FIG. 4 is a schematic perspective view of the constant force spring 20. In FIG. 4, a part of the constant force spring 20 is shown by a virtual line. The constant force spring 20 will be described with reference to FIG. 3 and FIG. 4. The constant force spring 20 is provided at the end of the cover 18 in the X1 direction. The constant force spring 20 has an elastic band 40, a first pulley 42, and a second pulley 44. The first pulley 42 and the second pulley 44 are supported by a first shaft 46a and a second shaft 46b of a spring support member 46. The spring support member 46 is fixed to the lid 18a. A sensor for detecting a rotation angle may be provided between the first pulley 42 and the first shaft 46a so that the control unit 28 can grasp the amount of unwinding of the flexible display body 12.

[0022] The cylinder support portion 42a at the X2 side end of the first pulley 42 is appropriately wide in the X direction and is fixed to the inner wall of the cylinder 14 via a rubber ring 48. The first pulley 42 has a larger diameter than the second pulley 44. The first pulley 42 has a larger width in the X direction than the second pulley 44, and is in a bearing structure between the first pulley 42 and the first shaft 46a. This bearing structure is, for example, a two-row type, and the cylinder 14 is stably supported and can rotate smoothly. The first shaft 46a has a hollow structure, and the interface cable 31 passes through it. The interface cable 31 is fixed by a grommet 47 in the hollow part of the first shaft 46a. The first pulley 42 is coaxial with the cover 18, and the second pulley 44 is in the bulge portion 18d. A part of the constant force spring 20 is arranged in the bulge portion 18d, but most of it fits inside the cylindrical part of the cover 18, and is sufficiently small and lightweight.

[0023] The elastic band 40 is a metal spring material having bending elasticity such that it naturally spirals, and is similar to a so-called spiral spring. The elastic band 40 hardly stretches in the pulling direction. The first pulley 42 is provided at the X1 side end of the cylinder 14, and the elastic band 40 is wound in the opposite direction to the direction in which it naturally spirals. The second pulley 44 winds up the elastic band 40 unwound from the first pulley 42 in the spiral direction of the natural state.

[0024] Such a constant force spring 20 always exerts a constant elastic force regardless of the amount of unwinding of the elastic band 40, and applies a rotational force to the first pulley 42. This rotational force applies a force F (see FIG. 2) that winds up the flexible display body 12 to the cylinder 14. The force F depends on the size of the flexible display body 12, and is, for example, about 800 gf.

[0025] FIG. 5 is a schematic diagram of the flexible display 12. In addition to the OLED 11, the flexible display 12 has a first sheet 50, a second sheet 52, and a pair of strips 54. The first sheet 50 is the base material of the flexible display 12, and is a flexible and lightweight sheet that can be easily wound around the cylinder 14. The OLED 11 is attached to almost the entire surface of the front side of the first sheet 50 except for both ends in the X direction. The strip 54 is provided over almost the entire length in the Y direction at both ends of the first sheet 50 where the OLED 11 is not present, but is slightly separated from the strip 54 and the second sheet 52. The strip 54 has an arc-shaped cross section similar to a metal tape measure called a convex, and can be wound around the cylinder 14 together with the OLED 11, and can keep the OLED 11 straight when unwound. The strip 54 does not basically overlap with the OLED 11, but may overlap with the end of the OLED 11 when provided outside the active area where display is performed or on the back surface of the first sheet 50.

[0026] The second sheet 52 is provided so as to extend the first sheet 50 at the Y2-direction end of the flexible display 12. The second sheet 52 is harder than the first sheet 50, and has particularly high tensile strength in the Y direction. The Y2-direction end of the OLED 11 is attached to the second sheet 52. The second sheet 52 is provided with a pull-out bar 26. The Y-direction dimension of the second sheet 52 is short, and the end of the OLED 11 and the pull-out bar 26 are sufficiently close to each other. Note that the term "sheet" in this application has a broad meaning and includes flexible materials such as cloth materials and mesh materials.

[0027] In this way, since the OLED 11 is attached to the soft first sheet 50 almost entirely, it is easy to wind it up around the cylinder 14. In addition, since both ends of the OLED 11 and the flexible display 12 are kept straight by the strip material 54 when unwound, they can be used in any direction. Furthermore, since the Y2 end of the OLED 11 and the flexible display 12 is held by the pull-out bar 26, and the Y1 end is held by the guide bar 62 and the stop roller 64 described later at the slit 18c, which is the unwinding opening, almost all of the four circumferences are held in a frame shape and are stable. When the pull-out bar 26 is gripped and pulled, tension is generated in the flexible display 12 by the constant force spring 20, but the OLED 11 and the pull-out bar 26 are connected by the hard second sheet 52, so there is no deterioration such as stretching or breaking. Furthermore, when the OLED 11 is wound up, a winding error occurs between the OLED 11 and the strip 54, causing a slight misalignment after winding, and if the strip 54 is attached to the hard second sheet 52, this winding error cannot be absorbed and a force like a torsional distortion is applied to the OLED 11. In contrast, in this embodiment, the strip 54 and the second sheet 52 are separated, so there is no such inconvenience.

[0028] 2 and 3, the fixing mechanism 24A is provided on a base 60 formed on one edge of the slit 18c in the cover 18, and has a guide bar 62, a stop roller 64, a push spring 66, and a pair of support angles 68. The base 60 has a block 60a fixed to the cylindrical portion of the cover 18, and a protruding wall 60b protruding in the Y2 direction from the block 60a.

[0029] The stop roller 64 is provided so as to traverse the entire width in the X direction along the inner winding surface 12c of the flexible display 12 relative to the cylinder 14. The inner winding surface 12c is the surface on which the OLED 11 is attached. The guide bar 62 is provided so as to traverse the entire width in the X direction along the unwinding surface 12d of the flexible display 12 relative to the cylinder 14.

[0030] The support angle 68 has an obtuse L-shape and supports both ends of the guide bar 62 and the stop roller 64. The support angle 68 has a pivot portion 68a at one end pivotally supported by the tip of the protruding wall 60b so as to be tiltable, the other end portion 68b rotatably supports the stop roller 64, and the bent portion 68c supports the guide bar 62 so as not to rotate. The stop roller 64 and the guide bar 62 are parallel to each other in the vicinity of each other, and the flexible display body 12 passes through a gap 70 between them. The gap 70 is appropriately narrow so that the pull-out bar 26 does not slip out to the Y1 side. The push spring 66 has one end engaged with the block 60a and the other end engaged with the intermediate portion between the pivot portion 68a and the bent portion 68c, and elastically biases the support angle 68 in the Y2 direction. In other words, the guide bar 62 and the stop roller 64 are elastically biased together in the Y2 direction via the support angle 68. The support angle 68 can be displaced in the Y2 direction until it hits a specific stopper (see FIG. 6), but the amount of displacement is small. The biasing force of the push spring 66 is small. The surfaces of the guide bar 62 and the stop roller 64 are made of silicone rubber (rubber material), which makes them less likely to slip on the flexible display body 12.

[0031] 6 is a schematic cross-sectional side view of the display device 10A when unwinding the flexible display body 12. When unwinding the flexible display body 12 from the slit 18c of the cover 18, the pull-out bar 26 is grasped and pulled while being slightly moved to the CW side (arrows A1, A2). The flexible display body 12 receives a force in the winding direction from the constant force spring 20, but the user can pull it out with a constant force regardless of the amount of pull-out.

[0032] At this time, the support angle 68 of the fixing mechanism 24A is pushed out by the push spring 66 (arrow A3) and displaced in the Y1 direction to a position where it hits the stopper. The flexible display body 12 passes through the gap 70 and can be pulled out without coming into contact with either the stop roller 64 or the guide bar 62.

[0033] In addition, when the OLED 11 is pulled out by lifting it upward, if the inner surface 12c abuts against the stop roller 64, the stop roller 64 is rotatable, so that the OLED 11 can be pulled out with almost no resistance, and the OLED 11 on the inner surface 12c is not damaged. Furthermore, when the outer surface 12d of the flexible display 12 abuts against the guide bar 62, the frictional force is small, and there is no impediment to pulling out the OLED 11.

[0034] When the flexible display body 12 is pulled out to a desired length and the pull-out bar 26 is released, the flexible display body 12 is fixed by the fixing mechanism 24A in the state shown in Fig. 2. In other words, the flexible display body 12 is momentarily wound in the Y2 direction by the constant force spring 20, displacing slightly in the CCW direction, and because the gap 70 is narrow, the outer surface 12d immediately comes into contact with the guide bar 62. Then, the support angle 68 displaces in the Y2 direction together with the flexible display body 12 due to the frictional force between the guide bar 62 and the outer surface 12d (arrow A4). The biasing force of the push spring 66 is small, so it does not hinder the displacement of the support angle 68.

[0035] The flexible display body 12 is tangential to the laminated winding part of the cylinder 14 (the cylinder 14 itself when the entire length of the flexible display body 12 is unwound) at the slit 18c, forming an acute-angled gap 72. The stop roller 64 enters the gap 72 by tilting the support angle 68 in the Y1 direction, and stops the retraction of the flexible display body 12 by acting like a wedge, and fixes it (arrow A5). The guide bar 62 is continuously biased in the Y1 direction by friction with the outer surface 12d, and the position of the support angle 68 is maintained. In reality, it takes only a moment from when the hand is released from the pull-out bar 26 to when the flexible display body 12 is fixed by the stop roller 64, and the amount of winding of the flexible display body 12 is extremely small, so that it can be fixed at any position without giving a sense of discomfort to the user. The fixing mechanism 24A fixes the flexible display body 12 so that it cannot be wound up, at least against the constant force spring 20, but the state of FIG. 2 is maintained even in the unwinding direction, and there is a corresponding fixing force.

[0036] The surface of the stop rollers 64 is made of silicone rubber, so the flexible display 12 does not slip while being wound up. The OLED 11 has a relatively strong bending elasticity, so it is reliably supported by the stop rollers 64 and the flexible display 12 is fixed. The stop rollers 64 act uniformly over the entire length of the OLED 11 in the X direction. The stop rollers 64 come into contact not only with the OLED 11 but also with the strip 54, which is maintained in a straight line, so that the flexible display 12 can be fixed more reliably.

[0037] Fig. 7 is a schematic cross-sectional side view of the display device 10 when the flexible display body 12 is released from its fixed state. Fig. 8 is a schematic cross-sectional side view of the display device 10 when the flexible display body 12 is rolled up and stored.

[0038] When releasing the fixation of the flexible display 12, the pull-out bar 26 is grasped and moved slightly in the CW direction as shown in Fig. 7. Then, the stop roller 64 rotates, and the support angle 68 does not move in either the Y1 or Y2 direction, but is balanced in a state where it is pushed slightly in the Y1 direction by the weak push spring 66. Specifically, the spring force of the push spring 66 should be smaller than the friction force between the silicone rubber surface of the stop bar 62 in Fig. 2 and the OLED 11, and should be strong enough to return the support angle 68 to the Y1 direction when it is free.

[0039] The guide bar 62 is released from the flexible display body 12 and is elastically biased in the Y1 direction by the push spring 66 and displaced (arrow A6). The stop roller 64 comes out of the gap 72 (arrow A7) and the flexible display body 12 is released from its fixed position. After this, the flexible display body 12 can be pulled out further as shown in FIG. 6. When rolling up and storing the flexible display body 12, if the pulling force on the pull-out bar 26 is released while keeping it in the CW direction as shown in FIG. 8 (arrow A8), the stop roller 64 will come into contact with the inner surface 12c and rotate (arrow A9) due to the winding force of the constant load spring 20, and the flexible display body 12 will be rolled up (arrow A10).

[0040] FIG. 9 is a schematic diagram of a fixing mechanism 24AA according to a first modified example. FIG. 10 is a schematic diagram of a fixing mechanism 24AB according to a second modified example. In the fixing mechanism 24AA, the protruding wall 60b extends further toward the Y1 side than the pivot support portion 68a, and a block 60a is located at the tip. A pull spring 66A is provided between the block 60a and the support angle 68, and the support angle 68 is elastically biased in the Y1 direction. In the fixing mechanism 24AB, a torsion spring 66B is provided around the pivot support portion 68a, and the support angle 68 is elastically biased in the Y1 direction. In each embodiment, the support angle 68 is in an obtuse L-shape, and the guide bar 62 and the stop roller 64 are disposed in appropriate positions, and the portion connecting the bent portion 68c and the pivot support portion 68a is substantially perpendicular to the Y direction, allowing the support angle 68 to tilt in a balanced manner toward the Y1 side and the Y2 side. However, the support angle 68 may be in a right-angled L-shape or a straight shape, etc., depending on the layout requirements.

[0041] FIG. 11 shows an example of how to use the display device 10A, where (a) shows the stored state, (b) shows the state ready for use, (c) shows the state in use, and (d) shows the put away state.

[0042] Since the display device 10A is small and lightweight, it can be attached to a lighting desk stand S and moved to any position as shown in Fig. 11. As shown in Fig. 11(a), the space it occupies can be reduced by storing it in a vertical orientation. When in use, the display device 10A can be set to any position and height.

[0043] The orientation of the display device 10A during use is not limited, and the flexible display 12 may be pulled down as shown in Fig. 11(b), may be pulled up as shown in Fig. 11(c), or may be pulled out sideways as shown in Fig. 11(d). As described above, the amount of pulling out of the flexible display 12 can be set arbitrarily. The display device 10A may be stored in a horizontal position.

[0044] According to the display device 10A described above, when the unwinding direction of the OLED 11 and the flexible display body 12 is in a relatively CW direction with respect to the slit 18c as a reference, the display device 10A is released (see FIG. 6), and when the unwinding direction is in a relatively CCW direction, the display device 10A is fixed so that the display device 10A cannot be wound up. In addition, the unwound flexible display body 12 is held in a frame shape by the pull-out bar 26, the guide bar 62, the stop roller 64, and the two strips 54, and is stable in any direction, so that the display device 10A can be used in both portrait and landscape orientations.

[0045] The display device 10A has an OLED 11 and a constant load spring 20 housed inside a cylindrical cover 18, and is small, lightweight, inexpensive, and highly portable. The display device 10A does not require a link mechanism as shown in Patent Document 1, and does not require a motor because it does not require power to drive the link mechanism. The display device 10A is small, lightweight, and rollable, making it suitable for mobile use or to support a simple stand.

[0046] Although the OLED 12 has a tendency to return to a flat shape, it is always biased by the constant load spring 20, so it is maintained in an appropriate wound state around the cylinder 14, and does not expand in the radial direction inside the space 16 and come into contact with the inner wall of the cover 18. Therefore, it does not slide against the cover 18 and is not damaged, or subjected to unnecessary frictional force. The display area of ​​the display device 10A can be changed, so the aspect ratio can be 1:3, 3:4, 4:3, 16:9, 21:9, etc. In this way, the display device 10A can be used in various ways. This allows the size to be changed depending on the purpose, such as on a train, as a main display on a desk, or as a large sub-display.

[0047] Next, a display device 10B according to a second embodiment will be described. The same components as those in the display device 10A described above are given the same reference numerals, and detailed description thereof will be omitted.

[0048] Fig. 12 is a schematic cross-sectional side view of the display device 10B in a state where the flexible display body 12 is released. Fig. 13 is a schematic cross-sectional front view of the display device 10B in a state where the flexible display body 12 is pulled out a predetermined amount from the cover 18 and fixed by the fixing mechanism 24B.

[0049] In the display device 10B, the flexible display body 12 is fixed by a fixing mechanism 24B instead of the fixing mechanism 24A. In the display device 10B, the counter-wound side (CCW side) of the flexible display body 12 relative to the cylinder 14 in the slit 18c is an end 18ca, and the winding side (CW side) is an end 18cb. Of these, the end 18ca acts as the fixing mechanism 24B. The ends 18ca and 18cb have, for example, a circular cross section and are somewhat thick.

[0050] 12, when the pull-out bar 26 is gripped and the cover 18 is rotated in the CCW direction relative to the cylinder 14 (arrow A12), the unwinding direction of the flexible display body 12 shifts relatively to the CW direction with the slit 18c as the reference. Then, the flexible display body 12 separates from the end 18ca on the CCW side at the slit 18c, and becomes available for unwinding and winding (arrow A13).

[0051] As shown in FIG. 13, when the pull-out bar 26 is released, the flexible display 12 is displaced to the CCW side at the slit 18c due to the force of the OLED 11 and the strip 54 trying to return to a flat shape. In other words, the cover 18 rotates in the CW direction relative to the flexible display 12 (arrow A14). The flexible display 12 is pressed by the end 18ca at the slit 18c (arrow A15). The flexible display 12 is fixed at the slit 18c because it is pressed against the laminated winding part of the cylinder 14 (the cylinder 14 itself when the entire length of the flexible display 12 is unwound). Such a display device 10B has a simple structure and can be made small and lightweight, and can be used as a tablet terminal, for example. The display device 10B can pull out the flexible display 12 by any length and use it in any orientation as it is, just like the display device 10A.

[0052] As shown in FIG. 14(a), the small and lightweight display device 10B can be used while being held in one hand, and the orientation of the flexible display body 12 is maintained even if the hand is released. As shown in FIG. 14(b), the small and lightweight display device 10B can be used by connecting a small flexible tripod T to the end of the cover 18 and attaching it to a pole P. Depending on the position of the center of gravity, the display device 10B can be used on a table using the flexible tripod T. Although the display devices 10A and 10B have been described in terms of their usage patterns in FIG. 11 and FIG. 14, the display device 10A can be used in the usage pattern shown in FIG. 14, and the display device 10B can be used in the usage pattern shown in FIG. 11. Since the display devices 10A and 10B are small and lightweight, they can also be used as wall-mounted or magnet-mounted.

[0053] The present invention is not limited to the above-described embodiment, and can of course be freely modified without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0054] 10,10A,10B display device 11. OLED 12 Flexible display 14 Cylinder 14b Slit 16 Winding space 18 Cover 18c slit 20 Constant Force Spring 24A,24AA,24AB,24B Fixing mechanism 26 Drawer bar 50 1st Sheet 52 2nd Sheet 54 Belt material 62 Guide bar 64 Stop roller 66 Push spring 68 Support Angle 70 Gap 72 Gap

Claims

1. OLED and A winding body that winds up the OLED from one end; A constant force spring that applies a winding force of the OLED to the winding body; A strip provided on both edges of the OLED along the unwinding extension direction, capable of being wound around the winding body together with the OLED, and maintaining the OLED in a straight line when unwinding; a fixing mechanism that releases the OLED when the unwinding direction of the OLED is a direction along a winding direction relative to the winding body, and fixes the OLED so that it cannot be wound when the unwinding direction is a direction along a counter-winding direction relative to the winding body; having The fixing mechanism includes: A guide bar is provided across the entire width of the OLED along an unwinding surface for the winding body; A stop roller provided across the entire width of the winding inner surface of the OLED relative to the winding body; having The stop roller and the guide bar are adjacent to each other and parallel to each other, and are elastically biased together in the unwinding direction of the OLED. When the unwinding direction of the OLED is a direction along the winding direction relative to the winding body, the guide bar and the stop roller are displaced in the unwinding direction by the action of an elastic biasing force and are in a position to release the fixation of the OLED, When the unwinding direction of the OLED is relatively along the counter-winding direction with respect to the winding body, the guide bar is displaced in the winding direction together with the OLED by frictional force due to the contact with the unwinding surface of the OLED, and the stop roller enters into an acute-angled gap formed between the winding inner surface of the OLED and the winding body. A display device comprising:

2. 2. The display device according to claim 1, The surface of the stop roller is made of rubber. A display device comprising:

3. An OLED; A winding body that winds up the OLED from one end; A constant load spring that applies a winding force to the winding body to wind up the OLED; A strip provided on both edges of the OLED along the unwinding extension direction, capable of being wound around the winding body together with the OLED, and maintaining the OLED in a straight line when unwinding; a fixing mechanism that releases the OLED when the unwinding direction of the OLED is a direction along a winding direction relative to the winding body, and fixes the OLED so that it cannot be wound when the unwinding direction is a direction along a counter-winding direction relative to the winding body; having a cover that secures a winding space for the OLED between the winding body and the cover, and through which the OLED is unwound from a slit; an end portion of the slit on a side opposite to a winding direction of the OLED relative to the winding body constitutes the fixing mechanism; When the unwinding direction of the OLED is a direction along the winding direction relative to the winding body, the end portion is separated from the OLED, When the unwinding direction of the OLED is along the direction opposite to the winding direction relative to the winding body, the end portion presses the OLED against the winding body due to a force that causes the OLED to return to a flat shape. A display device comprising:

4. The display device according to any one of claims 1 to 3, The OLED is attached to a first sheet; A second sheet is provided at the unwinding end of the OLED, the second sheet being harder than the first sheet and extending the first sheet; The second sheet is provided with a pull-out bar for gripping and unrolling the OLED. A display device comprising:

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