Rollable display device

Abstract

A roll-up screen device (10, 40) arranged in an opening of a building, comprising: a screen portion (14) shaped like a sheet; a solar cell (28) arranged in the screen portion (14); a clamping piece (17) suspending and securing the screen portion (14); a frame (15, 16, 31, 32) arranged on one side of the screen portion (14); and a charge and discharge control card (23) housed inside the frame (15, 16, 31, 32) that controls the charging and discharging of the electrical energy generated in the solar cell (28).

Description

Rollable display device Technical field The present invention relates to a rollable display device that includes a solar cell. Precedent technique In the related art, a rollable display device is known in which a solar cell is provided in a portion of the display (see, for example, Patent Literature 1). Literature related to the technique PATENT LITERATURE Patent Literature 1: JP 2011-179193 SUMMARY OF THE INVENTION Technical problem However, the method of using the generated energy is not described in rollable display devices that have a conventional power generation function as described in Patent Literature 1. This disclosure addresses the issue described above, and one of its purposes is to provide a technology that enables efficient use of energy generated in rollable display devices that include solar cells. Solution to the problem To solve the above problem, a roll-up screen device according to an embodiment of the present invention is a roll-up screen device disposed in an opening of a building and includes: a screen portion formed in the form of a sheet; a solar cell provided in the screen portion; a clamping portion that suspends and holds the screen portion; a frame disposed on one side of the screen portion; and a charge and discharge control board housed within the frame that controls the charging and discharging of the electrical energy generated in the solar cell. Brief description of the drawings Fig. 1 is a schematic perspective view to explain a rollable screen device according to the first embodiment. Fig. 2 is a schematic perspective view to explain a rollable display device according to the second embodiment. Description of the achievements Hereafter, the present invention will be described on the basis of preferred embodiments with reference to the drawings. The following configuration is for illustrative purposes to aid in understanding this disclosure, and its scope is determined solely by the scope of the appended claims. Identical or equivalent constituent elements and members illustrated in each drawing will be denoted by the same reference numbers, and duplicate explanations will be conveniently omitted. The dimensions of the elements in the drawings are enlarged or reduced as appropriate for ease of understanding. Some components in each figure may be omitted if they are not essential to the explanation. First realization Figure 1 is a schematic perspective view to illustrate a roll-up screen device 10 according to the first embodiment. This roll-up screen device 10 is used while attached to an opening in a building. In the embodiment shown in FIG. 1. The building opening is formed by frame materials such as mullions (vertical frames) 11 and 12 extending vertically and transoms (horizontal frames not shown) extending horizontally. A glass panel 13 is arranged on the exterior side of the building opening. The glass panel 13 is fixed to the mullions 11 and 12 by a predetermined support means, such as a structural sealant. The roll-up screen device 10 is arranged on the interior side of the building opening. The roll-up screen device 10 includes a screen part 14, a clamping piece 17 that suspends and holds the screen part 14, guide rails 30 that guide the raising and lowering of the screen part 14, and a pair of frames 15 and 16 that incorporate a loading / unloading control board and the like and are useful for forming the guide rails 30. The screen portion 14 consists of a flexible, rectangular, sheet-like body. The upper end of this screen portion 14 is longitudinally connected to a winding mechanism on the clamping piece 17, and the lower end has a bottom rail 18. The bottom rail 18 exerts a force-applying effect, pulling the screen portion 14 downwards and applying tension to it to increase its flatness. The screen portion 14 has a plurality of solar cells 28 incorporated within it. In the example in FIG. 1, a plurality of rectangular solar cells 28 are arranged side by side in the vertical (height) direction; however, the size, shape, and arrangement of the solar cells 28 are not particularly restricted, and any size, shape, and arrangement are possible. For example, a plurality of solar cells 28 that are square in plan view can be arranged in a matrix pattern along the entire length of the screen portion 14. In general, matrix arrangements are often used in crystalline silicon solar cells. The solar cells 28 are structured to utilize the photovoltaic effect and convert light energy into electrical energy. The electrical energy generated by each solar cell 28 is extracted from the upper end of the screen part 14 by means of a cable 27. At this time, the cable 27 can be extracted through a winding drum 29 attached to the clamping piece 17 that holds the screen part 14. The clamping piece 17 includes the winding drum 29 for winding the screen portion 14 and a tubular motor 19 for rotating the winding drum 29. In the embodiment shown in FIG. 1, the tubular motor 19 is illustrated outside the clamping piece 17 for illustrative purposes; however, in reality, the tubular motor 19 is arranged so that the rotor is located inside the winding drum 29. Driving the tubular motor 19 allows the screen portion 14 to be raised or lowered. The guide rails 30 are arranged at the respective left and right ends of screen portion 14 and are structured so that they overlap the end portions of screen portion 14. The guide rails 30 are fixed to the side surfaces of frames 15 and 16. The screen portion 14, which incorporates solar cells 28, is more prone to wrinkles and uneven surfaces compared to a fabric screen without integrated solar cells. Thanks to the guide rails 30, wrinkles and uneven surfaces on screen portion 14 can be reduced. Furthermore, by providing the guide rails 30, light and heat leakage from the side of screen portion 14 can be prevented, thereby improving light blocking, heat blocking, and thermal insulation performance.The gaps between the guide rails 30 and the screen portion 14 can be filled with mohair or similar material. The guide rails 30 can be fixed to the side surfaces of the uprights 11 and 12, respectively. Alternatively, gaps can be left between upright 11 and frame 15 and between upright 12 and frame 16, respectively, so that the guide rails 30 are fixed in place while being inserted between upright 11 and frame 15 and upright 12 and frame 16 at their respective ends. Frames 15 and 16 are hollow square pillars arranged on the sides of screen section 14 such that their longitudinal direction is parallel to the longitudinal direction of the mullions. Frame 15 is attached to mullion 11, and frame 16 is attached to mullion 12. The method of attaching the frames and their respective mullions is not particularly restricted and may involve screwing, gluing, fitting, welding, or similar means. The pair of frames 15 and 16 are spaced according to the width of the opening. In another embodiment, frames 15 and 16 can be members having a U-shaped cross-section arranged such that their longitudinal direction is parallel to the longitudinal direction of the uprights. Furthermore, frames 15 and 16 can be fixed to the crossbar or stool at the top and bottom and can be glued to uprights 11 and 12. In the rollable display device 10 according to the present embodiment, a charge and discharge unit 34 that charges and discharges the electrical energy generated by the solar cells 28 is housed in the frame 16. The charge and discharge unit 34 includes a motor control card 20, a maximum power point tracking (MPPT) control card 22, a charge and discharge control card 23, a communication control card 24, a power card 25, storage batteries (battery management unit BMU) 21, an external power connector, a circuit breaker, and a fan, wherein the fan is located at the top of the frame 16. These various cards and the storage batteries 21 are housed in the frame 16.However, the communication control card 24 is not limited to being inside frame 16 and can be positioned in a location where communication can be properly carried out, as required by the communication procedure. When the communication control card 24 is housed within frame 16, an opening for wireless communication can be provided in the frame. When the communication control card 24 is positioned outside frame 16, it can be mounted on top of the mounting piece 17, for example. Additionally, a power port 26 is located on a side surface of frame 16 to supply electrical power to an external electronic device. The location for the power port 26 is not limited to the side surface and can be anywhere on frame 16.The power port 26 can be, for example, a USB port or a DC power socket. In FIG. 1, the various circuit boards and storage batteries 21 are shown transparently for illustrative purposes; however, they are actually housed inside frame 16 and are therefore not visible from the outside. Furthermore, in FIG. 1, the motor control board 20 is shown outside frame 16 for convenience; however, the motor control board 20 is actually housed inside frame 16. The motor control board 20 can be located inside or on top of the mounting bracket 17. The MPPT control card 22 monitors the maximum operating point during real-time power generation according to changes in weather conditions. The charge and discharge control card 23 controls the charging and discharging of the storage batteries 21. The communication control card 24 manages communication with an external mobile terminal, such as a smartphone. The power supply card 25 controls the supply of electrical power to the outside via the power port 26. The motor control card 20 uses the electrical energy stored in the storage batteries 21 to control the drive of the tubular motor 19. Therefore, in the roll-up screen device 10 according to the present embodiment, all the components that perform power generation, charging, and power supply are integrated, and simply by attaching this roll-up screen device 10 to an opening in a building, the functions of power generation, charging, and power supply can be performed. Since the frames 15 and 16 are separate bodies from the mullions 11 and 12, adaptation to an existing building is straightforward. When the electrical energy generated by the solar cells 28 is charged to a distant storage battery, the cable length becomes excessive, and in addition to the need to ensure sufficient wiring space, the construction becomes more complex; furthermore, there is a possibility of increased energy loss. On the other hand, in the rollable display device 10 according to the present embodiment, since the electrical energy generated by the solar cells 28 can be charged to the storage battery 21 housed inside the nearby frame 16, the generated electrical energy can be used efficiently. Furthermore, in the roll-up screen device 10 according to the present embodiment, the tubular motor 19 is driven using self-generated electrical energy. Since it does not require a separate external power supply, it is extremely efficient and allows for energy savings. Additionally, it is possible to supply power from an external source (external power connector) in case of malfunction, etc. Furthermore, in the rollable display device 10 according to the present embodiment, a power port 26 is provided on a side surface of the frame 16. For example, a portable information terminal, such as an LED light, a desktop fan, or a smartphone, can be charged from the power port 26, and the generated electrical power can be used efficiently. In the embodiment described above, the charging and discharging unit 34 is housed only in one frame 16; however, part or all of the charging and discharging unit structure may be arranged in the other frame 15. In addition, a plurality of photovoltaic modules may be arranged (two or more in parallel) for a frame that houses a charging and discharging circuit. Second realization Figure 2 is a schematic perspective view illustrating a roll-up screen device 40 according to the second embodiment. This roll-up screen device 40 has a configuration in which a charging and discharging unit, comprising several storage plates and batteries, is located within the stiles 31 and 32, which form openings. That is, the stiles 31 and 32 of the second embodiment can be considered as integrally formed frames 15 and 16 and stiles 11 and 12 of the first embodiment described above. The clamping piece 17 can be supported by the stiles 31 and 32. While the roll-up screen device 10 according to the first embodiment is suitable for retrofitting an existing building, the roll-up screen device 40 according to the second embodiment is considered suitable for installation during new building construction.At that time, uprights 31 and 32 are preferably provided with a door to carry out maintenance of a loading and unloading circuit and the like. The rollable display device according to the above embodiment is structured to include a storage battery within a frame; however, in another embodiment, a rollable display device may be structured such that the frame does not include a storage battery and the charge / discharge control board housed in the frame controls the charging and discharging of an external storage battery through a power supply port. In this case as well, since the electrical energy generated by the solar cells 28 can be controlled by a nearby charge / discharge control board, the generated electrical energy can be used efficiently. The foregoing is an explanation of the present invention based on embodiments. These embodiments are intended to be illustrative only, and it will be obvious to those skilled in the art that various modifications and changes may be developed within the scope of the claims of the present invention and that such modifications and changes are also within the scope of the claims of the present invention. Therefore, the descriptions and figures in the specification should be treated in a demonstrative rather than a limited manner. Industrial applicability The present invention is applicable to a rollable display device that includes a solar cell. List of reference signs 10, 40 roll-up screen device, 11, 12, 31, 32 uprights, 13 glass panel, 14 screen part, 15, 16 frame, 17 clamping piece, 18 bottom rail, 19 tubular motor, 20 motor control card, 21 storage battery, 22 MPPT control board, 23 charge and discharge control card, 24 communication control card, 25 power board, 26 power port, 27 cable, 28 solar cell, 29 winding drum, 30 guide rail, 34 charge and discharge unit

Claims

1. A roll-up screen device (10, 40) arranged in an opening of a building, comprising: a screen portion (14) shaped like a sheet; a solar cell (28) arranged in the screen portion (14); a clamping piece (17) suspending and securing the screen portion (14); a frame (15, 16, 31, 32) arranged on one side of the screen portion (14); and a charge and discharge control card (23) housed inside the frame (15, 16, 31, 32) that controls the charging and discharging of the electrical energy generated in the solar cell (28).

2. The roll-up screen device (10, 40) according to claim 1, further comprising a storage battery (21) controlled by the charge and discharge control card (23) housed inside the frame (15, 16). 3.The roll-up screen device (10) according to claim 1 or 2, further comprising an MPPT control board (22) housed inside the frame (15, 16).

4. The roll-up screen device (40) according to claim 1, wherein the frame is integrally formed with a stile (31, 32).

5. The roll-up screen device (10) according to claim 1, wherein the frame (15, 16) is formed as a separate body from a stile (11, 12) of the opening and is fixed to the stile (11, 12) by means of a fixing member.

6. The roll-up screen device (10, 40) according to claim 2, further comprising: a tubular motor (19) for raising and lowering the screen portion (14), wherein the tubular motor (19) is driven by electrical energy stored in the storage battery (21). 7.The roll-up screen device (10, 40) according to claim 1, wherein the frame (15, 16, 31, 32) includes a power port (26) for supplying electrical power to an external electronic device.

8. The roll-up screen device (10, 40) according to claim 1, further comprising an external power connector for supplying power from the outside.

9. The roll-up screen device (10, 40) according to claim 1, wherein the charge and discharge control card (23) charges and discharges an external storage battery.