Display device

Abstract

To improve the performance of a display device.SOLUTION: A display device DSP1 includes a wiring board 10, a plurality of light-emitting elements 20 mounted on the wiring board 10, a light-transmitting circular plate 30 that supports the wiring board 10, a support stand 40 that can support a peripheral part of the circular plate 30 in a state of being able to rotate using a center 30C of the circular plate 30 as a rotary axis, a rotary driving part 50 that can rotate and operate the circular plate 30, a light emission control circuit C1 that can control on and off operations of the light-emitting elements 20, and a power supply circuit C2 that can supply power to each of the light-emitting elements 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Patent Document 1 (Japanese Patent Application Laid-Open No. 2023-31638) describes a rotary display device in which a plurality of light-emitting elements are arranged in a row on a rotatably supported substrate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-31638 Summary of the Invention [Problem to be solved by the invention]

[0004] A rotary display device can display text and graphic information by rotating a substrate with an array of multiple light-emitting elements at high speed. Furthermore, by using a thin strip-shaped substrate, the background of the displayed image, such as text and graphic information, can be seen.

[0005] However, there is room for improvement in such a rotary display device. For example, as described in Patent Document 1, when a support member for supporting the rotation axis of the substrate is provided on the extension line of the rotation axis, the support member obstructs the background.

[0006] An object of the present invention is to provide a technique for improving the performance of a display device. [Means for solving the problem]

[0007] A display device according to one embodiment includes a wiring board, a plurality of light-emitting elements mounted on the wiring board so as to be aligned along a first direction, a light-transmitting circular plate supporting the wiring board, a support base capable of supporting the peripheral portion of the circular plate while allowing it to rotate around the center of the circular plate as an axis of rotation, a rotation drive unit capable of rotating the circular plate, a light-emitting control circuit capable of controlling the on-off operation of the plurality of light-emitting elements, and a power supply circuit capable of supplying power to each of the plurality of light-emitting elements. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view illustrating a configuration example of a display device according to an embodiment. [Figure 2] 2 is a plan view showing a state in which an image is displayed by rotating the circular plate of the display device shown in FIG. 1. FIG. [Figure 3] FIG. 2 is a side view of the display device shown in FIG. [Figure 4] FIG. 4 is an explanatory diagram showing an example of the configuration of a circuit included in the display device shown in FIGS. 1 to 3. [Figure 5] FIG. 2 is an explanatory diagram showing an example of a structure for rotating the circular plate shown in FIG. [Figure 6] 6 is a top view showing an example of the structure of the upper surface side of the support base shown in FIG. 5. [Figure 7] FIG. 2 is a plan view showing a modification of FIG. [Figure 8] FIG. 2 is a plan view showing another modified example of FIG. [Figure 9] FIG. 2 is a plan view showing another modified example of FIG. [Figure 10] 1. FIG. 4 is a cross-sectional view showing a modified example of the wiring board shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. The disclosure is merely an example, and appropriate modifications that a person skilled in the art can easily conceive while maintaining the gist of the invention are naturally included within the scope of the present invention. Furthermore, in order to clarify the explanation, the drawings may show the width, thickness, shape, etc. of each part schematically compared to the actual embodiment. However, these are merely examples and are not intended to limit the interpretation of the present invention. Furthermore, in this specification and each drawing, elements similar to those described above with reference to the previous drawings may be designated by the same or related reference numerals, and detailed descriptions may be omitted as appropriate.

[0010] <Display device> First, a configuration example of a rotary display device, which is a display device of this embodiment, will be described. Fig. 1 is a plan view showing a configuration example of a rotary display device according to one embodiment. Fig. 2 is a plan view showing a state in which an image is displayed by rotating the circular plate of the display device shown in Fig. 1. Fig. 3 is a side view of the display device shown in Fig. 1. Fig. 4 is an explanatory diagram showing a configuration example of a circuit included in the display device shown in Figs. 1 to 3.

[0011] FIG. 1 shows the X direction and the Y direction. The X direction and the Y direction intersect with each other. In the example described below, the X direction is perpendicular to the Y direction. In the following description, the XY plane including the X direction and the Y direction will be described as a plane parallel to the display surface of the display device. In the following description, unless otherwise specified, "planar view" means a view of a plane parallel to the XY plane. Furthermore, the normal direction to the XY plane will be described as the "Z direction (see FIG. 3)" or thickness direction. The X direction, Y direction, and Z direction are directions that intersect with each other, and more specifically, are directions that are perpendicular to each other.

[0012] As shown in Figure 1, the display device DSP1 of this embodiment has a wiring substrate 10, a plurality of light-emitting elements 20, a circular plate 30, a support base 40, a rotation drive unit 50, a light-emitting control circuit C1, and a power supply circuit C2.

[0013] The wiring board 10 includes a plurality of wirings (board wirings) 11 (see FIG. 4) and an insulating layer 12 (see FIG. 10 described later) that insulates each of the plurality of wirings 11 from one another. Each of the plurality of light-emitting elements 20 is an element that emits visible light when supplied with power. In the present embodiment, each of the plurality of light-emitting elements 20 is, for example, a light-emitting diode element. Each of the plurality of light-emitting elements 20 mounted on the wiring board 10 is electrically connected to one of the plurality of wirings 11 of the wiring board 10.

[0014] The circular plate 30 is a disk that is circular in plan view as shown in Fig. 1. As shown in Fig. 3, the circular plate 30 has a front surface 30f and a back surface 30b located on the opposite side of the front surface 30f. The circular plate 30 supports the wiring board 10. There are various variations in the method by which the circular plate 30 supports the wiring board 10, but in this embodiment, the wiring board 10 is fixed onto the front surface 30f of the circular plate 30.

[0015] The plurality of light-emitting elements 20 are arranged side by side along a radial direction passing through the center 30C of the circular plate 30. In the example shown in Fig. 1, the plurality of light-emitting elements 20 are arranged in a single row. However, as a modified example, the plurality of light-emitting elements 20 may be arranged in two or more rows.

[0016] The support base 40 is a member capable of supporting the peripheral portion of the circular plate 30 in a state in which the circular plate 30 can rotate around the center 30C of the circular plate 30 as the rotation axis. The circular plate 30 is held on the support base 40 but is not fixed thereto. Therefore, when the driving force of the rotation drive unit 50 is transmitted to the circular plate 30 held on the support base 40, the circular plate 30 rotates around the center 30C as the rotation axis. An example of a structure in which the support base 40 supports the circular plate 30 in a rotatable state will be described later.

[0017] The rotation drive unit 50 is a drive unit capable of rotating the circular plate 30. The circular plate 30 can be rotated around the center 30C shown in Fig. 1 as the rotation axis by the driving force of the rotation drive unit 50. An example of the structure of the rotation drive unit 50 will be described later.

[0018] The light-emitting control circuit C1 is a circuit that can control the on-off operation of the plurality of light-emitting elements 20. In the example shown in Fig. 4, the light-emitting control circuit C1 includes a switching circuit C11 that switches the plurality of light-emitting elements 20 between an on state and an off state. The light-emitting control circuit C1 may also include a timing control circuit C12 that controls the switching timing of the light-emitting elements 20 based on a video signal and a clock signal. The light-emitting control circuit C1 may also include a clock signal generation circuit C14 that generates a clock signal to be transmitted to the timing control circuit C12, and a receiving circuit C15 that receives a video signal from an external device via wireless communication.

[0019] 4, one of the plurality of auxiliary circuits C13 is, for example, the clock signal generating circuit C14 described above. Another of the plurality of auxiliary circuits C13 is, for example, the receiving circuit C15 described above. Another of the plurality of auxiliary circuits C13 is, for example, a signal output circuit C16 for outputting a video signal acquired by the receiving circuit to the light-emitting element 20 via the switching circuit C11.

[0020] Although the example shown in FIG. 4 illustrates one timing control circuit C12 and three auxiliary circuits C13, the number and functions of the circuits included in the light emission control circuit C1 are not limited to these.

[0021] 1, the light-emission control circuit C1 is formed on the wiring board 10. However, as a modified example, the light-emission control circuit C1 may be formed outside the wiring board 10 (for example, inside the support base 40). Alternatively, some of the multiple types of circuits included in the light-emission control circuit C1 described above (for example, the switching circuit C11 in FIG. 4) may be formed on the wiring board 10, and the other parts (for example, the timing control circuit C12, the clock signal generation circuit C14, and the receiving circuit C15) may be formed outside the wiring board 10.

[0022] The power supply circuit C2 is a circuit capable of supplying power to each of the plurality of light-emitting elements 20. Power is supplied to each of the plurality of light-emitting elements 20, for example, via a light-emission control circuit C1 (more specifically, a switching circuit C11 of the light-emission control circuit C1). For example, while power is being supplied to the light-emitting element 20, the light-emitting element 20 lights up, and while the power supply to the light-emitting element 20 is stopped, the light-emitting element 20 is turned off.

[0023] The circular plate 30 is made of a light-transmitting material. Examples of the light-transmitting material of the circular plate 30 include inorganic transparent materials such as glass, and organic transparent materials such as acrylic and polycarbonate.

[0024] When the circular plate 30 is optically transparent, an object placed behind the rear surface 30b (see FIG. 3) (i.e., the background of the rear surface 30b) can be seen when viewed from the front surface 30f side of the circular plate 30. Conversely, when viewed from the rear surface 30b side of the circular plate 30, the background on the side of an object placed behind the front surface 30f (i.e., the background of the front surface 30f) can be seen.

[0025] On the other hand, the wiring board 10 can be made of a light-transmitting material like the circular plate 30, but can also be made of a light-blocking material. Generally, circuit boards are often made of a material that does not transmit light.

[0026] In the present embodiment, as described above, circular plate 30 rotates around center 30C as the rotation axis. Since wiring board 10 is fixed to circular plate 30, when circular plate 30 rotates, wiring board 10 also rotates around center 30C of circular plate 30 as the rotation axis. If the rotation speed becomes high, wiring board 10 (see FIG. 1) and the plurality of light-emitting elements 20 are not visible, and image 60 is perceived as floating above support base 40, as shown in FIG.

[0027] In this embodiment, the rotation drive unit 50 is disposed inside the support base 40, not on the rotation axis of the circular plate 30. Therefore, when viewed from the front surface 30f side, the background of the back surface 30b (see FIG. 3) is not obstructed by the rotation drive unit 50. Therefore, in the case of the display device DSP1, regardless of the shape of the rotation drive unit 50, the image 60 and the background of the display device DSP1 can be combined to provide a free expression.

[0028] <Configuration example of support base and rotation drive unit> Next, a configuration example of the support base 40 and the rotation drive unit 50 shown in Fig. 1 will be described. Fig. 5 is an explanatory diagram showing an example of a structure for rotating the circular plate shown in Fig. 1. Fig. 6 is a top view showing an example of the structure of the upper surface side of the support base shown in Fig. 5.

[0029] As shown in Fig. 5, the circular plate 30 includes a gear 32 having a plurality of gear teeth 32T on its periphery. In the example shown in Figs. 3 and 5, the gear 32 is sandwiched between two circular plates (wheels 30A and 30B shown in Fig. 3).

[0030] The rotation drive unit 50 also includes a drive gear 51 that engages with the plurality of gear teeth 32T of the circular plate 30 to drive the rotation of the circular plate 30, and a drive motor 53 that is capable of rotating the drive gear 51. In the example shown in FIG. 5 , the drive gear 51 is connected to the drive motor 53 via a shaft 52. The rotational force of the drive motor 53 is transmitted to the drive gear 51 via the shaft 52, and then transmitted to the gear 32 of the circular plate 30 via the drive gear 51. The rotation drive unit 50 is housed in the support base 40.

[0031] 5 shows a structure in which the drive gear 51 and the drive motor 53 are directly connected via the shaft 52 for simplicity, but various modified examples of the structure of the rotation drive unit 50 can be applied in addition to the embodiment shown in FIG. 5. For example, there is a case in which a plurality of relay gears (not shown) are interposed between the drive motor 53 and the drive gear 51.

[0032] Further, for example, the rotational force of the drive motor 53 may be transmitted to the circular plate 30 by a method other than gears to rotate the circular plate 30. Although not shown, a variation of the gear drive method shown in Fig. 5 is a method of transmitting the rotational force of the drive motor 53 to the circular plate 30 via a tire (a wheel with an insulating member such as rubber attached to the periphery).

[0033] An example of a structure in which the circular plate 30 is supported by the support base 40 is shown in Fig. 6. As shown in Fig. 6, the upper surface 40t of the support base 40 has a recess 41 at its center. The bottom surface 41b of the recess 41 has an arc shape that follows the circumference of the circular plate 30 in a transparent plan view, as shown in Fig. 5.

[0034] As shown in FIG. 6, the recess 41 includes rail portions 41A, 41B, a wiring connection portion 41C, and a gear arrangement portion 41G. The rail portion 41A is a portion that supports the wheel 30A of the circular plate 30 shown in FIG. 3. The rail portion 41B is a portion that supports a portion of the wheel 30B of the circular plate 30 shown in FIG. 3. A portion of a plurality of ball bearings 42 is exposed on the bottom surface 41b of each of the rail portions 41A and 41B. Each of the plurality of ball bearings 42 is arranged along the X direction. The side surfaces of the wheel 30A and the wheel 30B shown in FIG. 3 are in contact with and supported by the ball bearings 42 shown in FIG. 6.

[0035] In addition, a plurality of ball bearings 43 are arranged on the side surface 41s of the recessed portion 41. The front surface 30f and the back surface 30b of the circular plate 30 shown in Fig. 3 are each guided by the side surface 41s of the recessed portion 41 of the support base 40 via the plurality of ball bearings 43. This prevents the circular plate 30 from tipping over in the Z direction in Fig. 3 when it rotates.

[0036] 6 is a slit formed in the recess 41 of the support base 40. The gear arrangement portion 41G extends along the X direction, and a portion of the drive gear 51 housed inside the support base 40 protrudes from the gear arrangement portion 41G, which is the slit. When the circular plate 30 (see FIG. 5) is inserted into the recess 41 of the support base 40, the gear 32 of the circular plate 30 is positioned so as to overlap with the protruding portion of the drive gear 51.

[0037] 5, a plurality of gear teeth 32T of the gear 32 of the circular plate 30 mesh with the drive gear 51. Therefore, when the drive gear 51 rotates, the circular plate 30 rotates in accordance with the rotation of the drive gear 51.

[0038] At this time, as described above, the circular plate 30 is supported by the plurality of ball bearings 42 provided on the support base 40. Furthermore, each of the plurality of ball bearings 42 and the plurality of ball bearings 43 is rotatably attached to the support base 40. Therefore, when the circular plate 30 shown in FIG. 5 rotates, each of the plurality of ball bearings 42 and the plurality of ball bearings 43 shown in FIG. 6 rotates in response to the rotation of the circular plate 30, so that the rotation of the circular plate 30 is not hindered. In other words, the support base 40 can support the peripheral portion of the circular plate 30 in a rotatable state with the center 30C of the circular plate 30 as the rotation axis.

[0039] <Example of power supply to light-emitting element> Next, a structural example for supplying power to a plurality of light emitting elements mounted on wiring board 10 shown in FIG. 1 will be described.

[0040] 3, wiring 31 extending along the circumference of circular plate 30 is arranged on the peripheral edge of circular plate 30. In the example of the present embodiment, wiring 31VD and wiring 31VS extending along the circumference of circular plate 30 are arranged on side surface 30s of circular plate 30. Wiring 31VD is a supply path for a power supply potential, and wiring 31VS is a supply path for a reference potential (e.g., a ground potential).

[0041] The wiring 31 is electrically connected to each of the plurality of light-emitting elements 20 shown in Fig. 1. In the present embodiment, as shown in Figs. 1 and 3, wiring 33 is formed on the front surface 30f of the circular plate 30. In the example shown in Figs. 1 and 3, a plurality of wirings 33 (wiring 33VD which is a supply path for the power supply potential and wiring 33VS which is a supply path for the reference potential) are formed on the front surface 30f of the circular plate 30. Each of the plurality of wirings 33 is electrically connected to the wiring board 10 and the wiring 31.

[0042] Specifically, one end of the wiring 33 is electrically connected to the wiring 31, and the other end is electrically connected to the wiring board 10. More specifically, one end of the wiring 33VD, which is a supply path for the power supply potential, is connected to the wiring 31VD (see FIG. 3) formed on the side surface 30s of the circular plate 30, and the other end is electrically connected to the light-emitting element 20 mounted on the wiring board 10 via the wiring board 10. Furthermore, one end of the wiring 33VS, which is a supply path for the reference potential, is connected to the wiring 31VS (see FIG. 3) formed on the side surface 30s of the circular plate 30, and the other end is electrically connected to the light-emitting element 20 mounted on the wiring board 10 via the wiring board 10.

[0043] 5 and 6, connection terminals 44 that can be continuously connected to the wiring 31 (see FIG. 3) of the circular plate 30 during rotation are arranged on the support base 40. In the example shown in FIG. 6, a plurality of connection terminals 44 (connection terminal 44VD that is a supply path for the power supply potential and connection terminal 44VS that is a supply path for the reference potential) are arranged on the support base 40.

[0044] Each of the plurality of connection terminals 44 is made of, for example, a metal film formed in a strip shape. As shown in Fig. 5, when the circular plate 30 is placed in the recess 41 of the support base 40, the wiring 31VD shown in Fig. 3 comes into contact with the connection terminal 44VD shown in Fig. 6, and the wiring 31VS shown in Fig. 3 comes into contact with the connection terminal 44VS shown in Fig. 6. The connection terminal 44 is formed to be deformable so as to follow the shapes of the circular plate 30 and the recess 41 of the support base 40. Therefore, the connection terminal 44 and the wiring 31 remain in continuous contact even while the circular plate 30 is rotating.

[0045] Each of the plurality of connection terminals 44 is connected to a power supply circuit C2. Specifically, the connection terminal 44VD is connected to a terminal for a power supply potential of the power supply circuit, and the connection terminal 44VS is connected to a terminal for a reference potential of the power supply circuit.

[0046] 5, when the circular plate 30 is accommodated in the recess 41 of the support base 40, the plurality of light-emitting elements 20 are electrically connected to the power supply circuit C2 via the wiring 31, the wiring 33, and the connection terminal 44, as shown in FIG. 4. This allows the power supply circuit C2 to supply power to the plurality of light-emitting elements 20 via the connection terminal 44, the wiring 31, and the wiring 33.

[0047] 4, a light-emitting control circuit C1 electrically connected to each of the plurality of light-emitting elements 20 is disposed on the wiring board 10. The wiring board 10 has a plurality of wirings (board wirings) 11 that electrically connect each of the plurality of light-emitting elements 20 to the light-emitting control circuit C1. The power supply potential and reference potential supplied from the power supply circuit C2 are supplied to the plurality of light-emitting elements 20 via the wiring board 10 (more specifically, the light-emitting control circuit C1 and the plurality of wirings 11).

[0048] 4, the power supply potential and reference potential supplied from the power supply circuit can be used as power for driving the plurality of circuits included in the light-emitting control circuit C1 in addition to the plurality of light-emitting elements 20. As shown in FIG. 4, the power supply circuit C2 can supply power to the light-emitting control circuit C1 via the connection terminal 44, the wiring 31, and the wiring 33.

[0049] In this embodiment, all of the multiple wirings 31 formed on the periphery of the circular plate 30 are wirings for supplying power. However, as a modified example, there is a case where a control signal is transmitted via some of the multiple wirings 31 formed on the periphery of the circular plate 30, as will be described later.

[0050] In a structure in which only power is supplied via a plurality of wires 31 formed on the periphery of the circular plate 30, as in the present embodiment, the number of wires 31 formed on the circular plate 30 may be small. This is preferable because it allows for a simplified layout of the wires 31. A simplified layout of the wires 31 makes it easier to manufacture the circular plate 30. Alternatively, simplifying the layout of the wires 31 can improve the reliability of the electrical connection between the support base 40 and the circular plate 30. For example, in the portion where the connection terminals 44 and the wires 31 are connected, the distance between adjacent wires 31 can be sufficiently wide, thereby preventing short circuits between adjacent wires 31.

[0051] In this embodiment, a control signal such as a video signal supplied to the light-emitting element 20 shown in Fig. 4 is transmitted from an external device via wireless communication. As described above, one of the auxiliary circuits C13 shown in Fig. 4 is a receiving circuit C15 (see Fig. 4) that receives a video signal from the outside via wireless communication. Note that the receiving circuit C15 may receive a command signal in addition to the video signal.

[0052] In this way, by providing the receiving circuit C15 on the wiring board 10, it is possible to ensure normal operation even if the plurality of wirings 31 shown in FIG. 3 are only wirings for supplying power.

[0053] As another variation of this embodiment, there is a method of providing the power supply circuit C2 on the wiring board 10. In this case, it is possible to supply power to the power supply circuit C2 from the outside in a contactless manner, for example, by using electromagnetic induction. Alternatively, the power supply circuit formed on the wiring board 10 may include a rechargeable secondary battery.

[0054] However, from the viewpoint of stably supplying power to the plurality of light-emitting elements 20, a method of supplying power via wiring 31 as in the present embodiment is preferable. Furthermore, when a secondary battery is mounted on wiring board 10, the mass of the secondary battery may hinder the stable rotation of circular plate 30. Therefore, from the viewpoint of stably rotating circular plate 30, a method of supplying power via wiring 31 as in the present embodiment is preferable.

[0055] <Modification of wiring formation position> Next, a description will be given of typical modifications to the display device described above. Fig. 7 is a plan view showing a modification to Fig. 1. Fig. 8 is a plan view showing another modification to Fig. 1.

[0056] 3, each of the multiple wirings 31 is formed on a side surface 30s of the circular plate 30. However, the position where the multiple wirings 31 are formed is not limited to the side surface 30s, and they may be formed on the front surface 30f or the back surface 30b as long as they are located on the periphery of the circular plate 30.

[0057] The display device DSP2 shown in FIG. 7 differs from the display device DSP1 shown in FIG. 1 in that a plurality of wirings 31 are formed on the front surface 30f. On the front surface 30f of the circular plate 30, the plurality of wirings 31 are arranged between the wiring substrate 10 and the side surface 30s (in other words, the outer edge of the front surface 30f). This is to bring each of the plurality of wirings 31 into contact with the connection terminals 44 of the support base 40. In addition, in the case of the display device DSP2, the connection terminals 44 connected to each of the plurality of wirings 31 are formed on the side surface 41s of the recess 41 of the support base 40 shown in FIG. 6.

[0058] Furthermore, by combining a technique for forming wiring 31 on the side surface 30s of the circular plate 30, as in the display device DSP1 shown in FIG. 1, with a technique for forming wiring 31 on the periphery of the front surface 30f (or the back surface 30b shown in FIG. 3), as in the display device DSP2 shown in FIG. 7, it is possible to transmit control signals via the wiring 31.

[0059] The display device DSP3 shown in Fig. 8 differs from the display device DSP1 shown in Fig. 1 in that it includes wiring 31SG formed on the periphery of the front surface 30f, in addition to wiring 31VD and wiring 31VS (not shown in Fig. 8) formed on the side surface 30s of the circular plate 30 described with reference to Fig. 3. The wiring 31SG extends along the circumference of the circular plate 30. The wiring 31SG is a signal wiring for supplying control signals to the plurality of light-emitting elements 20. The control signals transmitted through the wiring 31SG include the above-mentioned video signals.

[0060] 8, for ease of viewing, one wiring 31SG is shown, but the number of wirings 31SG is not limited to one and may be multiple. Also, in the example shown in FIG. 8, the wiring 31SG is formed on the front surface 30f, but as a further modification, it may be formed on the rear surface 30b shown in FIG. 3. Alternatively, the wiring 31SG may be formed on both the front surface 30f and the rear surface 30b.

[0061] The wiring 31SG is electrically connected to any one of the plurality of light-emitting elements 20. In the example shown in Fig. 8, the wiring 31SG is electrically connected to each of the plurality of light-emitting elements 20 via a switching circuit C11 formed on the wiring substrate 10.

[0062] Furthermore, a connection terminal 44SG is arranged on the support base 40, which can be continuously connected to the wiring 31SG of the circular plate 30 during rotation. The connection terminal 44SG is attached to a side surface 41s of the recess 41 of the support base 40 shown in FIG. 6, and can be continuously in contact with the wiring 31SG during rotation. The connection terminal 44SG is electrically connected to the light-emission control circuit C1 in the support base 40. The connection terminal 44SG is a connection terminal 44 for signal transmission.

[0063] In the case of the display device DSP3, since it has a signal transmission path that can electrically connect the support base 40 and the light-emitting element 20, at least a part of the light-emission control circuit C1 can be disposed within the support base 40. For example, of the light-emission control circuit C1 described with reference to FIG. 4, the timing control circuit C12 and the plurality of auxiliary circuits C13 can be disposed within the support base 40. On the other hand, from the viewpoint of improving the response speed of the light-emitting element 20, it is preferable that the switching circuit C11 be formed on the wiring substrate 10 as shown in FIG. 8.

[0064] When a part of the light-emission control circuit C1 is disposed inside the support base 40, the light-emission control circuit C1 can be electrically connected to a source of video signals and command signals via wires. Therefore, among the multiple auxiliary circuits C13 described with reference to FIG. 4, the receiving circuit C15 can be omitted.

[0065] In the case of the display device DSP3, the light-emitting control circuit C1 disposed in the support base 40 can supply control signals to the plurality of light-emitting elements 20 via the connection terminals 44 and the wiring 31SG.

[0066] <Modifications for improving visibility of wiring board> Next, a description will be given of a modification for improving the visibility of the wiring board 10 shown in Fig. 1. Fig. 9 is a plan view showing another modification to Fig. 1. Fig. 10 is a cross-sectional view showing a modification to the wiring board shown in Fig. 1.

[0067] The display device DSP4 shown in FIG. 9 has a wiring board 10A whose planar shape is different from that of the wiring board 10 of the display device DSP1 shown in FIG.

[0068] The wiring board 10A has a fan shape in a plan view. Although not shown, the wiring board may have a trapezoidal shape as a modification of FIG. 9. Of the multiple sides of the wiring board 10A, the length of the side 10s1 closest to the center 30C of the circular plate 30 is shorter than the length of the side 10s2 farthest from the center 30C of the circular plate 30.

[0069] When we look at the speed of a rotating object, the closer it is to the axis of rotation, in other words, the smaller the radius of rotation, the shorter the circumference. Therefore, the speed of an object moving closer to the axis of rotation is slower than at positions farther away from the axis of rotation.

[0070] In each of the display devices DSP1, DSP2, and DSP3 already described, the wiring board 10 itself does not have the property of transmitting light. The wiring board 10A of the display device DSP4 shown in FIG. 9 also does not have the property of transmitting visible light, similar to the wiring board 10 already described.

[0071] However, wiring board 10 already described and wiring board 10A shown in FIG. 9 each rotate at high speed in conjunction with the rotational movement of circular plate 30. Therefore, even if wiring board 10 or wiring board 10A does not have optical transparency, the shapes of these structures are difficult to see. On the other hand, light emitted from multiple light-emitting elements 20 is easily seen as an afterimage. As a result, an image 60 such as that shown in FIG. 2 is seen due to the afterimage of light.

[0072] In this display method, the portion of wiring board 10, 10A that is positioned closer to the rotation axis moves at a relatively slower speed, and is therefore easier to see than the portion that is farther from the rotation axis.

[0073] Therefore, in this modified example, like wiring board 10A shown in FIG. 9, the length of side 10s1 close to center 30C, which is the axis of rotation, is designed to be shorter than the length of side 10s2 far from center 30C.

[0074] This reduces the visibility of the wiring board 10A, making it easier to selectively view the image 60 shown in FIG.

[0075] Furthermore, from the viewpoint of reducing the visibility of the wiring board, it is possible to use a wiring board 10B having optical transparency, as in the modified example shown in Fig. 10. As schematically shown by the outline arrow in Fig. 10, wiring board 10B has optical transparency.

[0076] Specifically, the conductor pattern CP including the plurality of wirings 11 is made of a so-called transparent electrode material. A representative example of a transparent electrode material is ITO (Indium Tin Oxide). The insulating layer 12 that electrically insulates the plurality of wirings 11 is made of an inorganic transparent material such as silicon dioxide, or an organic transparent material such as acrylic or polycarbonate. In this way, by replacing the wiring board 10 shown in FIG. 1 with a light-transmitting wiring board 10B made of a transparent material, the visibility of the wiring board 10 can be reduced.

[0077] Although the above describes an embodiment and representative modifications, the above-described technology can be applied to various modifications other than the exemplary modifications. For example, although not shown, as a modification of the method of fixing the wiring board 10 to the circular plate 30 shown in FIG. 1 , the wiring board 10 may be embedded inside the circular plate. For example, if the circular plate 30 is composed of a support portion and a cover portion, the wiring board 10 and multiple light-emitting elements 20 can be disposed between the support portion and the cover portion. In this case, there is no need to consider interference between the wiring board 10 and the support base 40 when rotating the circular plate 30. Therefore, the wiring board 10 may extend to the outer edge of the circular plate 30, thereby widening the range in which the image 60 shown in FIG. 2 can be displayed.

[0078] Furthermore, for example, the above-described modifications may be combined with each other.

[0079] Within the scope of the concept of the present invention, a person skilled in the art may conceive of various modifications and alterations, and it is understood that these modifications and alterations also fall within the scope of the present invention. For example, to the above-described embodiments, a person skilled in the art may appropriately add, delete, or modify components, or add, omit, or change conditions of steps, and these modifications are also included within the scope of the present invention as long as they maintain the gist of the present invention. [Industrial Applicability]

[0080] The present invention can be used in display devices and electronic devices incorporating display devices. [Explanation of symbols]

[0081] 10, 10A, 10B wiring board 10s1, 10s2 sides 11. Wiring (board wiring) 12 Insulating layer 20 Light-emitting element 30 circular plate 30A,30B wheels 30b back 30C center 30f front 30s,41s side 31, 31SG, 31VD, 31VS, 33, 33VD, 33VS wiring 32 gears 32T gear teeth 40 Support stand 40t top surface 41 Recess 41A, 41B rail section 41b Bottom 41C Wiring connection 41G Gear arrangement section 42,43 Ball bearings 44, 44SG, 44VD, 44VS connection terminal 50 Rotation drive unit 51 Drive gear 52 Shaft 53 Drive motor 60 images C1 Light emission control circuit C2 power supply circuit C11 Switching circuit C12 Timing control circuit C13 Auxiliary circuit C14 Clock signal generation circuit C15 Receiver Circuit C16 signal output circuit CP conductor pattern DSP1,DSP2,DSP3,DSP4 Display device

Claims

1. A wiring board; a plurality of light-emitting elements mounted on the wiring substrate so as to be aligned along a first direction; a light-transmitting circular plate that supports the wiring board; a support base capable of supporting a peripheral portion of the circular plate in a rotatable state around the center of the circular plate as a rotation axis; a rotation drive unit capable of rotating the circular plate; a light-emitting control circuit capable of controlling the on-off operation of the plurality of light-emitting elements; a power supply circuit capable of supplying power to each of the plurality of light-emitting elements; A display device having:

2. In claim 1, the circular plate includes a gear having a plurality of gear teeth on its periphery; The rotation drive unit is a drive gear that engages with the plurality of gear teeth of the circular plate to drive a rotational movement of the circular plate; a drive motor capable of rotating the drive gear; Including, The display device, wherein the rotation drive unit is housed within the support base.

3. In claim 1, Wiring is arranged on the peripheral edge of the circular plate, extending along the circumference of the circular plate; the wiring is electrically connected to each of the plurality of light-emitting elements, a connection terminal is disposed on the support base, the connection terminal being capable of continuously contacting the wiring of the circular plate during the rotation; The power supply circuit is capable of supplying power to the plurality of light-emitting elements via the connection terminals and the wiring.

4. In claim 3, the light-emitting control circuit electrically connected to each of the plurality of light-emitting elements is disposed on the wiring board; the wiring board has a plurality of board wires that electrically connect each of the plurality of light-emitting elements to the light-emission control circuit, The power supply circuit is capable of supplying power to the light-emission control circuit via the connection terminal and the wiring.

5. In claim 4, The light emission control circuit a switching circuit for switching the plurality of light-emitting elements between an on state and an off state; a receiving circuit that receives a video signal from an external device via wireless communication; a timing control circuit that controls the switching timing of each of the plurality of light-emitting elements based on the video signal and a clock signal; a clock signal generating circuit that generates the clock signal to be transmitted to the timing control circuit; A display device comprising:

6. 4. A display device according to claim 3, wherein the wiring is formed on a side surface of the circular plate.

7. In claim 1, the circular plate has a front surface and a back surface opposite the front surface; a wiring extending along the circumference of the circular plate is disposed on a peripheral edge of the front surface or the back surface of the circular plate; the wiring is electrically connected to any one of the plurality of light-emitting elements, a connection terminal is disposed on the support base, the connection terminal being capable of continuously contacting the wiring of the circular plate during the rotation; The light-emitting control circuit is disposed within the support base, and is capable of supplying control signals to the plurality of light-emitting elements via the connection terminals and the wiring.

8. In claim 1, the wiring substrate has a fan shape or a trapezoid shape in a plan view, A display device, wherein, of the multiple sides of the wiring substrate, a first side closest to the center of the circular plate has a length shorter than a second side farthest from the center of the circular plate.

9. The display device according to claim 1 , wherein the wiring substrate is optically transparent.

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