Display device

Abstract

The invention provides a display device which can be electrically and manually operated and is small in size and capable of being wound. A display device (10A) is provided with: an OLED (12); a column body (14) around which the OLED (12) is wound from one end; a cover (18) that ensures a winding space for the OLED (12) between the cover (18) and the column body (14); a constant force spring (20) that applies a winding force of the OLED (12) to the column body (14); a motor (22) that applies a winding force and / or an unwinding force of the OLED (12) to the column body (14); a drag mechanism (24) that transmits rotation between the motor (22) and the cylinder (14) via a friction disk (58); and a pull-out rod (26) that is provided at the other end of the OLED (12) and that urges the pull-out force by the winding force of the constant force spring (20) and the suspension.

Description

Technical Field

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

[0002] Patent Document 1 discloses a rollable display device. This display device is a display device in which a display unit is rolled up and stored inside a desktop housing, and the display unit is raised and lowered by a motor using a link mechanism.

[0003] Patent document 1: Japanese Patent Application Publication No. 2021-140162.

[0004] The rollable display device can be stored in a small area and volume, but the display device of Patent Document 1 has a link mechanism, etc., so it is large as a whole. In addition, if the display device can be rolled up or unwound not only electrically but also manually, it is convenient for users to use. Summary of the invention

[0005] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a compact rollable display device that can be operated electrically and manually.

[0006] In order to solve the above-mentioned problems and achieve the purpose, the display device involved in the embodiment of the present invention comprises: an OLED; a winding body, on which the above-mentioned OLED is wound from one end; a cover, which ensures a winding space for the above-mentioned OLED between the above-mentioned winding body; a constant force spring, which applies a winding force of the above-mentioned OLED to the above-mentioned winding body; a motor, which applies at least one of the winding force and the unwinding force of the above-mentioned OLED to the above-mentioned winding body; a drag mechanism, which transmits rotation between the above-mentioned motor and the above-mentioned winding body via a friction member; and a sinker, which is arranged at the other end of the above-mentioned OLED and applies force to the above-mentioned winding force based on the above-mentioned constant force spring and the pulling force of the suspension.

[0007] According to the above-mentioned method of the present invention, a simple structure is provided in which rotation is transmitted between the motor and the winding body via the friction member, and since the constant force spring and the weight are suspended, a small motor is sufficient, and miniaturization can be achieved as a whole. In addition, since sliding occurs at the part of the friction member, electric and manual operation can be performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram showing a display device and its peripheral equipment according to an embodiment of the present invention.

[0009] Figure 2 is a schematic cross-sectional side view of a display device.

[0010] Figure 3 It is a schematic cross-sectional front view of the display device according to the first embodiment.

[0011] Figure 4 It is a schematic three-dimensional diagram of a constant force spring.

[0012] Figure 5 It is a schematic exploded perspective view of the drag mechanism.

[0013] Figure 6 It is a schematic cross-sectional front view of a display device according to a second embodiment.

[0014] Figure 7 The figures are diagrams showing examples of use of the display device, wherein (a) is a diagram showing a stored state, (b) is a diagram showing a use preparation state, (c) is a diagram showing a use state, and (d) is a diagram showing other use states.

[0015] Description of Reference Numerals

[0016] 10, 10A, 10B...display device; 12...OLED; 12a...one end; 12b...the other end; 14...column (wound body); 14b...slit; 16...space; 18...cover; 18c...slit; 20...constant force spring; 22...motor; 24A, 24B...drag mechanism; 26...pull-out rod (sinking weight); 28...control unit; 30...display control unit; 40...elastic band; 42...first pulley; 44...second pulley; 46...spring supporting member; 50...rotating shaft; 50a...base end threaded portion; 50b...front end threaded portion; 50c...middle portion; 54...adjusting nut; 56...coil spring; 58...friction disc; 58b, 60c...friction plate; 60a...outer ring; 60b...inner ring; 62...fixing nut; 70c...friction plate; 72...annular spacer. DETAILED DESCRIPTION

[0017] Hereinafter, an embodiment of a display device according to the present invention will be described in detail based on the drawings. However, the present invention is not limited to this embodiment.

[0018] Figure 1 Schematic diagram showing a display device 10 and its peripheral devices according to an embodiment of the present invention. Figure 2 2 is a schematic cross-sectional side view of the display device 10 .

[0019] The display device 10 uses an OLED (Organic Light Emitting Display) 12 as a display. The OLED 12 has the characteristics of being thin and light, low power consumption, and having excellent contrast and responsiveness. In addition, the OLED 12 is flexible and can be rolled up, but has relatively strong bending elasticity and has the property of returning to a planar shape as long as there is no external force. As the display device 10, a display device 10A involved in the first embodiment and a display device 10B involved in the second embodiment are described in turn. In this embodiment, the size of the OLED 12 is, for example, about 20 inches or 30 inches.

[0020] Figure 3 1 is a schematic cross-sectional front view of the display device 10 involved in the first embodiment. The display device 10A has an OLED 12, a column (wound body) 14, a cover 18, a constant force spring 20, a motor 22, a drag mechanism 24A, a pull-out rod (sinking weight) 26, a control unit 28, and a display control unit 30. The column 14 is cylindrical, and the OLED 12 is wound from one end 12a on its surface. In the description of the display device 10A, the extension direction of the column 14 is set as the X direction. The column 14 is cylindrical, and the X direction is equivalent to the cylindrical axis direction of the column 14. The constant force spring 20 is arranged on the opposite side of the column 14 relative to the motor 22 and the drag mechanism 24A, and the constant force spring 20 side is set as the X1 direction, and the motor 22 and the drag mechanism 24A side is set as the X2 direction.

[0021] The control unit 28 and the display control unit 30 are provided in the hollow portion 14a of the column 14. The control unit 28 and the display control unit 30 are elongated and provided along the X direction. The control unit 28 and the display control unit 30 are connected by a control line.

[0022] The control unit 28 is equivalent to the motherboard in a common computer, and performs overall control of the display device 10A, and is connected to external devices via an interface cable 31. The interface cable 31 forms a spiral portion 31a, and the rotation of the column 14 is not transmitted to the outside. The control unit 28 also controls the motor 22. The control unit 28 rotates the motor 22 forward and reverse based on a specified operation signal, thereby imparting a winding force and an unwinding force of the OLED 12 to the column 14. However, at least one of the winding force and the unwinding force may be imparted to the OLED 12 according to the specifications. In the power transmission between the control unit 28 and the motor 22, a spiral portion may be provided on the power line or a slip ring may be used.

[0023] As external devices, keyboard 32, mouse 34, communication port 36, and external battery 38 are listed. These external devices are connected as needed and can be disconnected when not needed. Control unit 28 may also be located outside display device 10A. Battery may also be located in display device 10A.

[0024] The display control unit 30 controls the display of the OLED 12, and is, for example, a timing controller. Figure 2 ), one end 12a of the OLED 12 is connected to the display control unit 30 via a plurality of display control lines 30a from the slit 14b. From the perspective of lateral display timing, the display control unit 30 is preferably disposed in the vicinity of one end 12a of the OLED 12 in the lateral direction, preferably in the hollow portion 14a in the X direction.

[0025] The cover 18 is a cylindrical frame that covers the entire display device 10A, and its two ends are closed by covers 18a and 18b. The covers 18a and 18b may also be provided with a power switch, a brightness adjustment switch of the OLED 12, a lifting switch of the OLED 12, etc. A bulge 18d for accommodating the constant force spring 20 is formed in the X1 direction of the cover 18. The cover 18 is larger in diameter than the column 14 to some extent, and a winding space 16 for the OLED 12 is ensured between the cover 18 and the column 14. In the present embodiment, the diameter of the cover 18 is about 30 mm.

[0026] The cover 18 has a slit 18c (see Figure 2 ). The other end 12b of the OLED 12 extends out of the slit 18c. A pull-out rod 26 is provided over the entire length of the other end 12. The pull-out rod 26 is used to hold the OLED 12 when it is unwound. For example, it is made of stainless steel and has a diameter that is easy to hold. When the display device 10A is horizontal, the pull-out rod 26 exerts a force Fd (see FIG. 1 ) to unwind the OLED 12 downward due to its own weight. Figure 2 ).

[0027] Figure 4 2 is a schematic three-dimensional diagram of the constant force spring 20. Figure 4 In FIG. 1 , a portion is shown by an imaginary line. Figure 3 , Figure 4 The constant force spring 20 is described. The constant force spring 20 is provided at the end portion of the cover 18 in the X1 direction. The constant force spring 20 has an elastic belt 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 cover 18a. A sensor for detecting a rotation angle may also be provided between the first pulley 42 and the first shaft 46a, so that the unwinding amount of the OLED 12 can be grasped by the control unit 28.

[0028] The column 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 column 14 via a rubber ring 48. The diameter of the first pulley 42 is larger than that of the second pulley 44. The width of the first pulley 42 in the X direction is larger than that of the second pulley 44, and it forms a bearing structure with the first shaft 46a. The bearing structure is, for example, a two-row type, and the column 14 is stably supported and can rotate smoothly. The first shaft 46a is a hollow structure, and the interface cable 31 passes through the inside. The interface cable 31 is fixed to the hollow part of the first shaft 46a by a metal eyelet 47. The first pulley 42 is coaxial with the cover 18, and the second pulley 44 is in the bulge 18d. A part of the constant force spring 20 is arranged in the bulge 18d, but most of it is housed inside the cylinder of the cover 18, which is small and light enough.

[0029] The elastic band 40 is a metal spring material having bending elasticity when swirled in a natural state, and is a material like a so-called coil spring. The elastic band 40 is almost not stretched in the tensile direction. The first pulley 42 is provided at the X1 side end of the column 14, and the elastic band 40 is wound in the direction opposite to the direction of the swirling in the natural state. The second pulley 44 winds the elastic band 40 unwound from the first pulley 42 in the swirling direction in the natural state.

[0030] Such a constant force spring 20 always exerts a constant elastic force regardless of the unwinding amount of the elastic band 40 and imparts a rotational force to the first pulley 42. The rotational force imparts a force Fu (see FIG. 1 ) to the column 14 to wind up the OLED 12. Figure 2 The winding force Fu and the unwinding force Fd are set to be equal. The forces Fu and Fd also depend on the size of the OLED 12, etc., and are, for example, about 800 gf.

[0031] Figure 5 24A is a schematic exploded perspective view of the drag mechanism 24A. Figure 3 , Figure 5 The motor 22 and the drag mechanism 24A are described. The motor 22 is, for example, a DC motor with a built-in reducer, and applies a winding force and an unwinding force of the OLED 12 to the column 14 via the drag mechanism 24A. As described above, the motor 22 is disposed at the end portion in the X2 direction of the cover 18. The motor 22 and its rotating shaft 50 are supported on the inner wall of the cover 18 via the bracket 52. A bearing may also be provided between the rotating shaft 50 and the bracket 52.

[0032] The drag mechanism 24A is provided between the motor 22 and the column 14, and includes an adjustment nut 54, a coil spring 56, a friction plate 58, a bearing 60, and a fixing nut 62, and includes the rotating shaft 50 of the motor 22 as components. The motor 22 and the drag mechanism 24A are accommodated inside the cover 18, and are small and light.

[0033] The rotating shaft 50 has a base end threaded portion 50a having a relatively large diameter on the X2 side, a front end threaded portion 50b having a relatively small diameter on the X1 side, and an intermediate portion 50c having a medium diameter between the base end threaded portion 50a and the front end threaded portion 50b. There is a step 50d at the boundary between the base end threaded portion 50a and the intermediate portion 50c, and there is a step 50e at the boundary between the intermediate portion 50c and the front end threaded portion 50b. The front end threaded portion 50b is a double-sided D-cut shape formed with two parallel planes 50ba. The intermediate portion 50c is a double-sided D-cut shape formed with two parallel planes 50ca.

[0034] The bearing 60 has an outer ring 60a, an inner ring 60b, and a friction plate 60c. A double-sided D-cut hole 60d is formed at the center of the inner ring 60b so that the front end threaded portion 50b can not be relatively rotated. The inner ring 60b has its X2 side abutting against the step 50e when the front end threaded portion 50b is engaged with the hole 60d, and its X1 side is fixed to the rotating shaft 50 by a fixing nut 62 screwed with the front end threaded portion 50b.

[0035] The outer ring 60a has the same diameter as the column support portion 42a and is fixed to the inner wall of the column 14 via the rubber ring 48. The friction plate 60c is an annular ring with a suitable radial width and is provided along the periphery of the X2 side of the outer ring 60a. The friction plate 60c may also be omitted according to design conditions.

[0036] The friction disc 58 includes a circular plate 58a and a friction plate 58b. The circular plate 58a is made of metal and has a double-sided D-cut hole 58c formed in the center so that the middle portion 50c can be non-rotatably engaged. The circular plate 58a is engaged with the hole 58c through the middle portion 50c, thereby being arranged to be non-rotatable relative to the rotating shaft 50 and axially displaceable.

[0037] The circular plate 58a has the same diameter as the outer ring 60a. The friction plate 58b is the same as the friction plate 60c and is provided along the periphery of the X1 side of the circular plate 58a. In other words, the friction plate 58b and the friction plate 60c face each other. It is preferred that the friction plates (friction members) 58b and 60c are friction plates that generate relatively small friction and are less prone to aging, for example, made of polyacetal material, cork material, felt material, etc. Figure 3 , Figure 5 In FIG. 5 , the friction plates 58 b and 60 c are shown by a dot pattern. In addition, the friction plates 58 b and 60 c are not affected by the oil film and are stable because they are dry-type.

[0038] The adjusting nut 54 is screwed with the base end threaded portion 50a, and the door 18e provided on the cover 18 is opened, and the screwing position can be adjusted manually or with a tool. Two adjusting nuts 54 can also be provided and the position can be fixed by a double nut method. The coil spring 56 is provided between the adjusting nut 54 and the friction disk 58, and the compression amount is adjusted by the adjusting nut 54. In other words, for the friction disk 58 including the friction plate 58b, the coil spring 56 subjected to the force based on the base end threaded portion 50a and the adjusting nut 54 elastically presses the outer ring 60a and the friction plate 60c as the friction object. The surface pressure of the friction plate 58b and the friction plate 60c can be adjusted by adjusting the compression amount of the coil spring 56, so that the friction force generated between the two can be adjusted. The friction force generated between the friction plate 58b and the friction plate 60c is relatively small. In this embodiment, the force converted into the unwinding and winding force of the OLED 12 is about 100 to 200 gf.

[0039] The display device 10A thus constructed houses the OLED 12, the constant force spring 20, the motor 22, and the drag mechanism 24A in the cylindrical cover 18, is small, light, inexpensive, and has excellent portability. The display device 10A does not require the link mechanism shown in Patent Document 1, and has a simple and light structure, and does not require a large power to drive the link mechanism, so a small motor 22 is sufficient.

[0040] The OLED 12 has the property of returning to a planar shape, but is always urged by the constant force spring 20, so it maintains an appropriate winding state relative to the column 14, and does not expand in the outer diameter direction inside the space 16 and abut against the inner wall of the cover 18. Therefore, it does not slide between the cover 18 and be damaged, or receive unnecessary friction.

[0041] In the manual operation of the display device 10A, the OLED 12 can be unwound by holding the pull-out rod 26 and pulling it downward. At this time, the column 14, the first pulley 42 and the outer ring 60a rotate integrally, and the rotating shaft 50, the friction disc 58 and the inner ring 60b do not rotate. In addition, the friction disc 58 receives a rotational force from the friction plate 58b, but stops due to the action of the built-in reducer of the motor 22. It takes a force of 10 gf to pull down the pull-out rod 26. If a reduction ratio of 1:120 is used, it becomes 10×120=1200 gf. Even if the friction force on the friction disc 58 is quite large, the rotating shaft 50 does not rotate and remains in a stopped state. In fact, even if wire cutters are used, the rotating shaft 50 cannot be rotated by hand. Slip occurs between the friction plate 58b and the friction plate 60c, but the friction between the two is set small enough to have almost no effect on the unwinding of the OLED 12.

[0042] The winding force Fu and the unwinding force Fd are set to be substantially equal, so that the user can pull out the OLED 12 with very light force regardless of the unwinding amount of the OLED 12 from the cover 18, and a free stop function can be realized to stop at an arbitrary position.

[0043] It is preferred that force Fu and force Fd are completely consistent, but sometimes it is difficult to completely balance them due to factors such as actual tolerances. However, even if there is a slight difference between the two, as described above, the friction force of about 100 to 200 gf between the friction plate 58b and the friction plate 60c also acts as a slight brake, so it can stop freely. When the OLED 12 is stored in the cover 18, by gently pushing up the pull-out rod 26, it can be wound around the column 14 through the winding action of the constant force spring 20. It can also stop freely in the middle of the winding.

[0044] During the electric operation of the display device 10A, the motor 22 is rotated forward or reversely. At this time, the motor 22 rotates the rotating shaft 50, the friction disk 58, and the inner ring 60b. Moreover, the rotation of the friction disk 58 is transmitted to the outer ring 60a via the friction plates 58b and 60c. The outer ring 60a is integrated with the column 14, so the OLED 12 can be unwound or wound by rotating the column 14. A pull-out rod 26 that also serves as a sinker is provided at the other end 12b of the OLED 12, but in this case, the unwinding force Fd based on the pull-out rod 26 is also offset by the constant force spring 20, and the motor 22 can unwind and wind the OLED 12 with a sufficiently small output. It can also stop at any position in the case of electric operation.

[0045] In addition, since the power of the motor 22 to drive the column 14 is small enough, the friction between the friction plate 58b and the friction plate 60c can be small, and the friction plates 58b and 60c are less deteriorated. In addition, when the friction is reduced due to the wear of the friction plates 58b and 60c, the friction can be appropriately restored by re-adjusting the adjustment nut 54.

[0046] The power required to rotate the column 14 by the motor 22 is small enough, so the friction force of the friction plates 58b and 60c transmitted by the motor 22 is small enough compared to 800 gf of the force Fu and Fd. As mentioned above, it is confirmed that about 100 to 200 gf is sufficient. If the force Fu and Fd are used as the reference, about 1 / 8 to 1 / 4 is sufficient.

[0047] As described above, in the display device 10A, the OLED 12 can be unwound and wound by electric or manual operation. In the display device 10A, the constant force spring 20 is provided on the opposite side to the motor 22 and the drag mechanism 24A, so that the weight balance is good. In addition, when the covers 18a and 18b are removed, the constant force spring 20 is exposed from the X1 side, and the motor 22 and the drag mechanism 24A are exposed from the X2 side, so that the maintainability is good.

[0048] Figure 6 1 is a schematic cross-sectional front view of a display device 10B according to the second embodiment. In the display device 10B, a drag mechanism 24B is used instead of the drag mechanism 24A described above. In the drag mechanism 24B, the same components as those of the drag mechanism 24A are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0049] The drag mechanism 24B is provided with a rotating shaft 70, a friction disc 70a, and an annular spacer 72. The rotating shaft 70 and the friction disc 70a are equivalent to the rotating shaft 50 and the friction disc 58 described above. The friction disc 70a is formed integrally with the rotating shaft 70. A friction plate 70c is provided on the X1 side of the friction disc 70a. The friction plate 70c is the same as the friction plate 58b described above. The annular spacer 72 is provided between the friction disc 70a and the inner ring 60b. The front end threaded portion 70b of the rotating shaft 70 protrudes toward the X1 side from the center hole of the inner ring 60b. The inner ring 60b is clamped by a fixing nut 62 screwed with the front end threaded portion 70b and fixed to the annular spacer 72. It is sufficient as long as the inner ring 60b and the front end threaded portion 70b cannot rotate relative to each other through a D-cut surface or the like. The drag mechanism 24B has a simpler structure than the drag mechanism 24A.

[0050] Figure 7 The figures show usage examples of the display device 10 , wherein (a) shows a storage state, (b) shows a use preparation state, (c) shows a use state, and (d) shows other use states.

[0051] Since the display device 10 is small and light, Figure 7 As shown, it can be installed on the lighting stand S and moved to any position for use. Figure 7 As shown in (a), if it is placed vertically in the storage state, the occupied space can be reduced.

[0052] like Figure 7 As shown in (b), the display device 10 can be set at any position and height level when in use. Figure 7 As shown in (c), the OLED 12 can be pulled downward from this state and used. As described above, the pulling amount of the OLED 12 can be set arbitrarily.

[0053] like Figure 7As shown in (d), if it is set to the vertical position again when storing, the unwinding force Fd exerted downward by the pull-out rod 26 on the OLED 12 disappears. In this way, only the winding force Fu based on the constant force spring 20 acts on the OLED 12, and automatic winding can be performed without using electricity. Of course, winding can also be performed manually or electrically in this previous stage. The display device 10 can also be stored in a horizontal state. Since the display device 10 is small and light, it can also be used as a wall-mounted type or a magnet-mounted type.

[0054] The present invention is not limited to the above-described embodiments, and can of course be freely modified within a scope not departing from the gist of the present invention.

Claims

1. A display device, characterized in that: have: OLED; A winding body, on which the OLED is wound from one end; A cover, which ensures a winding space for the OLED between the cover and the winding body; A constant force spring, applying a winding force of the OLED to the winding body; a motor for applying at least one of a winding force and an unwinding force to the winding body to the OLED; a drag mechanism that transmits rotation between the motor and the winding body via a friction member; as well as A sinker is disposed at the other end of the OLED and applies force to the winding force based on the constant force spring and the pulling force of the suspension.

2. The display device according to claim 1, characterized in that The winding body is in a cylindrical shape, and a display control unit of the OLED is arranged inside along the cylindrical axis direction.

3. The display device according to claim 1, characterized in that The friction member is provided to be non-rotatable relative to the rotating shaft of the motor but axially displaceable, and elastically presses a friction object by a spring with a force of a thread and a nut.

4. The display device according to claim 1, characterized in that The constant force spring has: Elastic band, swirled in its natural state; A first pulley, disposed at one end of the winding body, winding in a direction opposite to the direction in which the elastic band rotates in a natural state; as well as The second pulley winds up the elastic band unwound from the first pulley in the swirling direction of the natural state.

5. The display device according to claim 1, characterized in that The motor and the drag mechanism are disposed on an opposite side of the winding body relative to the constant force spring.

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