CN110706598B - A foldable display device - Google Patents

Abstract

The application discloses a foldable display device, which comprises a first shell, a rolling assembly, a stretching assembly, a first rotating assembly, a second shell and a flexible display assembly, wherein a first storage cavity is arranged in the first shell, the rolling assembly is arranged in the first storage cavity, the stretching assembly is connected with the first shell in a sliding mode, the first rotating assembly is connected with one end, far away from the first shell, of the stretching assembly, the second shell is connected with the first rotating assembly, one part of the second shell is arranged on the same side of the first shell and the second shell, and the other part of the second shell stretches into the first storage cavity and is connected with the rolling assembly; the second shell is rotationally connected with the stretching assembly through the first rotating assembly; when the flexible display assembly in the first accommodating cavity is stretched out, the winding assembly provides a furled elastic tension for the flexible display assembly. The application provides a foldable display device with larger display area, more convenient carrying and simpler structure.

Description

A foldable display device

Technical Field

The present application relates to the technical field of display panels, and in particular to a foldable display device.

Background Art

Currently, OLED (Organic Light Emitting Diode) has attracted widespread attention for its bendability and flexibility. By folding or rolling up OLED, the space occupied by a larger screen can be reduced, making it more portable. Therefore, folding and rolling display devices have become the main research direction of flexible OLED screens.

Existing flexible OLED screens include two types of display screens: foldable and rollable. Although the above two types of display screens reduce the size of the display device to a certain extent, they still occupy a large space, which is not conducive to the storage and carrying of larger flexible OLED screens. In addition, existing foldable display devices require compensatory design for the connecting components used for shell folding in the folding area to avoid the flexible display screen from being damaged due to the contraction or expansion of the connecting components during the bending process. However, the existing connecting component structure design is relatively complex and occupies a large space, which is not conducive to saving production costs and improving production efficiency.

Therefore, how to realize a flexible display device with a larger display area and easier to carry is an important research direction.

Summary of the invention

The embodiment of the present application provides a foldable display device to realize a foldable display device with a larger display area and more convenient to carry.

The embodiment of the present application provides a foldable display device, comprising a first shell with a first storage cavity disposed therein, a winding assembly disposed in the first storage cavity, a stretching assembly slidably connected to the first shell, a first rotating assembly connected to one end of the stretching assembly away from the first shell, a second shell connected to the first rotating assembly, and a flexible display assembly having a portion disposed on the same side of the first shell and the second shell and another portion extending into the first storage cavity and connected to the winding assembly; wherein the second shell is rotationally connected to the stretching assembly via the first rotating assembly;

When the flexible display assembly in the first receiving cavity is stretched out, the rolling assembly provides a retracting elastic pulling force for the flexible display assembly.

Optionally, the flexible display assembly includes a first display portion, a second display portion and a third display portion which are arranged adjacent to each other in sequence;

The first display portion is disposed on one side of the second shell, and one end of the first display portion away from the second display portion is connected to the second shell, and one end of the third display portion away from the second display portion is connected to the winding assembly.

Optionally, when the foldable display device is in the first state, the stretching assembly and the first shell are mutually unfolded, and the second shell and the stretching assembly are mutually unfolded.

The flexible display component is laid on the same side of the second shell, the stretching component and the first shell, and the first display portion corresponds to the second shell, the second display portion corresponds to the stretching component, and the third display portion corresponds to the first shell.

Optionally, when the foldable display device is in the second state, the stretching assembly and the first shell are overlapped with each other, and the second shell and the stretching assembly are folded with each other;

The first display part and the second display part are laid on the same side of the second shell and the first shell, and the first display part corresponds to the second shell, the second display part corresponds to the first shell, and the third display part is rolled up in the first storage cavity by the rolling component.

Optionally, the second shell includes a first sub-shell, a second sub-shell and a second rotating assembly located between the first sub-shell and the second sub-shell; the first sub-shell is rotationally connected to the second sub-shell through the second rotating assembly; the first sub-shell is also connected to the first rotating assembly, and the first sub-shell is also rotationally connected to the stretching assembly through the first rotating assembly.

Optionally, the first display portion includes a first sub-display portion and a second sub-display portion that are adjacently arranged, the first sub-display portion is located between the second display portion and the second sub-display portion, the first sub-display portion is arranged corresponding to the first sub-shell, and the second sub-display portion is arranged corresponding to the second sub-shell.

Optionally, when the foldable display device is in the first state, the stretching assembly and the first shell are deployed with each other, and the first sub-shell, the second sub-shell and the stretching assembly are all deployed;

The flexible display component is laid on the same side of the first sub-shell, the second sub-shell, the stretching component and the first shell, and the first sub-display portion corresponds to the first sub-shell, the second sub-display portion corresponds to the second sub-shell, the second display portion corresponds to the stretching component, and the third display portion corresponds to the first shell.

Optionally, when the foldable display device is in the second state, the stretching assembly and the first shell are overlapped with each other, the first sub-shell and the stretching assembly are folded with each other, and the second sub-shell and the first sub-shell are folded with each other;

The first sub-display portion, the second sub-display portion and the second display portion are laid on the same side of the second sub-shell, the first sub-shell and the first shell, and the first sub-display portion corresponds to the first sub-shell, the second sub-display portion corresponds to the second sub-shell, the second display portion corresponds to the first shell, and the third display portion is rolled up in the first storage cavity by the rolling assembly.

Optionally, when the foldable display device is in the second state, the stretching assembly, the first sub-shell and the second sub-shell are stacked in a Z-shape.

Optionally, when the foldable display device is in the third state, the stretching assembly and the first shell are overlapped with each other, the second shell and the stretching assembly are rotated to form a preset angle, and the first sub-shell and the second sub-shell are unfolded with each other;

The flexible display component is laid on the same side of the first shell, the first sub-shell, and the second sub-shell, the first sub-display portion corresponds to the first sub-shell, the second sub-display portion corresponds to the second sub-shell, the second display portion corresponds to the first shell, and the third display portion is rolled up in the first storage cavity by the rolling component.

Optionally, the preset angle ranges from 60 degrees to 120 degrees.

Optionally, a first opening communicating with the first receiving cavity is provided on a side of the first shell away from the second shell; and an end of the third display portion away from the second display portion is connected to the winding assembly through the first opening.

Optionally, the first shell is provided with a second opening on a side away from the first opening, the second opening is communicated with the first receiving cavity, and the stretching assembly is received in the first receiving cavity through the second opening to overlap with the first shell.

Optionally, a third opening is provided on a side of the stretching assembly away from the second shell, and the stretching assembly is also provided with a second receiving cavity connected to the third opening, and the first shell is received in the second receiving cavity through the third opening to overlap with the stretching assembly.

Optionally, the winding assembly includes a coil spring, the coil spring is located in the first receiving cavity and connected to the first shell, and one end of the flexible display assembly extending into the first receiving cavity is connected to the coil spring.

Optionally, the first rotating assembly includes a first rotating shaft and a second rotating shaft arranged side by side, and a first connecting member and a second connecting member located at two ends of the first rotating shaft and the second rotating shaft, the two ends of the first rotating shaft are rotatably connected to the first connecting member and the second connecting member respectively, and the two ends of the second rotating shaft are rotatably connected to the first connecting member and the second connecting member respectively;

A side of the stretching assembly close to the second shell is fixedly connected to the first rotating shaft, and a side of the second shell close to the stretching assembly is fixedly connected to both ends of the second rotating shaft.

Optionally, an LCD display screen is provided on a side of the second shell away from the flexible display assembly.

The beneficial effects of the present application are as follows: in the present application, when the foldable display device is fully unfolded, the first shell, the stretching assembly and the second shell are unfolded from each other, and the flexible display assembly located in the first storage cavity of the first shell is stretched out, so that the flexible display assembly is unfolded on the first shell, the stretching assembly and the second shell, effectively increasing the display area, and the elastic tension provided by the winding assembly to the flexible display assembly at this time is conducive to keeping the flexible display assembly in a flat state, which can improve the display effect; when the foldable display device is folded and stored, the stretching assembly is overlapped with the first shell, and the second shell and the stretching assembly are folded, a part of the flexible display assembly is folded, and the other part is curled in the first storage cavity, and the winding assembly and the stretching assembly can automatically adjust the curling length of the flexible display assembly, thereby adjusting the length of the flexible display assembly of the folded part, and preventing the flexible display assembly from being damaged due to the change in the overall length of the stretching assembly, the first rotating assembly and the second shell surface during the folding process;

Therefore, on the one hand, the present application enables a foldable display device with a large display area to present a smaller volume when folded and stored, which is easy to carry; on the other hand, the rolling component can not only keep the flexible display component in a flat state when the foldable display device is unfolded, but also adjust the curling length of the flexible display component when the foldable display device is folded to automatically compensate for the length of the folded part of the flexible display component, thereby avoiding damage to the flexible display component when folded; and the automatic compensation function of the rolling component and the stretching component in the foldable display device can make the structural design of the first rotating component simpler, greatly reducing the production cost and efficiency; in addition, the foldable display device of the present application has a large display area and a small storage volume, and can be used as an electronic map, etc. The larger display area can see the terrain and layout more clearly, and the smaller storage volume is convenient to carry and has a wide range of applications.

BRIEF DESCRIPTION OF THE DRAWINGS

The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

FIG1 is a schematic structural diagram of a foldable display device with an unfolded stretching assembly provided by an embodiment of the present application;

FIG2 is a schematic structural diagram of a fully unfolded foldable display device provided in an embodiment of the present application;

Fig. 3 is a schematic diagram of the cross-sectional structure of A-A' in Fig. 2;

Fig. 4 is another schematic diagram of the cross-sectional structure of A-A' in Fig. 2;

FIG5 is a schematic diagram of the structure of a flexible display assembly provided in an embodiment of the present application;

FIG6 is a schematic structural diagram of a fully foldable foldable display device provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of a connection structure between a stretching assembly and a second shell provided in an embodiment of the present application;

FIG8 is a schematic diagram of a connection structure between another stretching assembly and a second housing provided in an embodiment of the present application;

FIG9 is a schematic diagram of a connection structure between another stretching assembly and a second housing provided in an embodiment of the present application;

FIG10 is a schematic structural diagram of another fully foldable foldable display device provided in an embodiment of the present application;

FIG11 is a schematic structural diagram of another foldable display device with an unfolded stretching assembly provided in an embodiment of the present application;

FIG12 is a schematic structural diagram of another fully unfolded foldable display device provided in an embodiment of the present application;

FIG13 is a schematic structural diagram of another fully foldable foldable display device provided in an embodiment of the present application;

FIG. 14 is a schematic structural diagram of another foldable display device with an unfolded stretching assembly provided in an embodiment of the present application.

DETAILED DESCRIPTION

The specific structural and functional details disclosed herein are merely representative and are for the purpose of describing exemplary embodiments of the present application. However, the present application can be implemented in many alternative forms and should not be interpreted as being limited to the embodiments described herein.

In the description of the present application, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof are intended to cover non-exclusive inclusions.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "one", "one" and "one" used herein are also intended to include plural forms. It should also be understood that the terms "include" and/or "comprise" used herein specify the existence of stated features, integers, steps, operations, units and/or components, without excluding the existence or addition of one or more other features, integers, steps, operations, units, components and/or combinations thereof.

The present application is further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 8, the embodiment of the present application provides a foldable display device 1, including a first shell 2, a second shell 3, a winding assembly 4, a stretching assembly 5, a first rotating assembly 6 and a flexible display assembly 7; a first storage cavity 8 is provided inside the first shell 2, and the winding assembly 4 is provided in the first storage cavity 8, wherein the winding assembly 4 has an automatic winding function; the stretching assembly 5 is slidably connected to the first shell 2; the first rotating assembly 6 is connected to an end of the stretching assembly 5 away from the first shell 2, and is connected to an end of the second shell 3 close to the stretching assembly 5, and the second shell 3 is connected to the first rotating assembly 6 through the first rotating assembly 6. The stretching component 5 is rotatably connected; a part of the flexible display component 7 is arranged on the same side of the first shell 2 and the second shell 3, and the other part extends into the first storage cavity 8 and is connected to the winding component 4; the flexible display component 7 can be curled on the winding component 4 by the winding action part of the winding component 4, so as to be stored in the first storage cavity 8, and the flexible display component 7 can also be stretched out from the winding component 4 in the first storage cavity 8 for display under the action of the pulling force; when the flexible display component 7 located in the first storage cavity 8 is stretched out, the winding component 4 provides a retracting elastic pulling force for the flexible display component 7.

Specifically, as shown in FIG. 2 , the flexible display assembly 7 includes a first display portion 9, a second display portion 10, and a third display portion 11 which are arranged adjacent to each other in sequence; the first display portion 9 is arranged on one side of the second shell 3, and the end of the first display portion 9 away from the second display portion 10 is connected to the second shell 3, and the end of the third display portion 11 away from the second display portion 10 is connected to the winding assembly 4. It should be noted that the first display portion 9, the second display portion 10, and the third display portion 11 of the flexible display assembly 7 are integrally formed in the same process, and are only divided into the first display portion 9, the second display portion 10, and the third display portion 11 in terms of the display area; in addition, as shown in FIG. 5 , the component structure of the flexible display assembly 7 includes a flexible screen 12, a protective cover plate 13 located on the flexible screen 12, and an adhesive layer 14 located between the protective cover plate 13 and the flexible screen 12, wherein the length of the protective cover plate 13 is greater than the length of the flexible screen 12, the flexible screen 12 is used for display, and the protective cover plate 13 is used to protect the flexible screen 12 on the one hand. It is not scratched or damaged. On the other hand, it is used for fixed connection of the two ends of the flexible display component 7. For example, the first display part 9 is fixedly connected to the end of the second shell 3 away from the first shell 2 through the protective cover 13, and the third display part 11 is fixedly connected to the winding component 4 through the protective cover 13. During the use and storage of the foldable display device 1, the protective cover 13 extending from the third display part 11 and not covering the flexible screen 12 is located in the first storage cavity 8; the protective cover 13 includes a flexible PI (Polyimide Film) film or a flexible cover glass, which is not limited here.

As shown in FIG. 2 , when the foldable display device 1 is in the first state (fully unfolded state), the stretching assembly 5 and the first shell 2 are mutually unfolded (specifically, the stretching assembly 5 slides in a direction away from the first shell 2 to unfold, or the first shell 2 slides in a direction away from the stretching assembly 5 to unfold), and the second shell 3 and the stretching assembly 5 are mutually unfolded (specifically, the second shell 3 and the stretching assembly 5 are rotated to unfold by the first rotating assembly 6). At this time, the first shell 2, the stretching assembly 5 and the second shell 3 are unfolded in the same direction; the flexible display assembly 7 is laid on the same side of the second shell 3, the stretching assembly 5 and the first shell 2. Specifically, the first The display part 9 corresponds to the second shell 3, the second display part 10 corresponds to the stretching component 5, and the third display part 11 corresponds to the first shell 2. At this time, the first display part 9, the second display part 10 and the third display part 11 are located on the same plane and can be used for large-screen display. The second shell 3, the stretching component 5 and the first shell 2 provide support for the first display part 9, the second display part 10 and the third display part 11 respectively, which is beneficial to improve the display effect and protect the flexible display component 7; and the winding component 4 provides an elastic pulling force for the flexible display component 7 to retract into the first storage cavity 8, so that the first display part 9, the second display part 10 and the third display part 11 are in a flat state.

Of course, during the use of the foldable display device 1, the stretching component 5 can be fully stretched to between the first shell 2 and the second shell 3, or partially stretched out or not stretched out, depending on the occasion of use and the need for the display area. When the stretching component 5 is not stretched out, only the first display part 9 and the second display part 10 are used for display; when the stretching component 5 is fully stretched out, the first display part 9, the second display part 10 and the third display part 11 are all used for display. It should be noted that during the unfolding process of the foldable display device 1, the stretching component 5 can be stretched to any position within the stretchable range to adjust to the required display area.

As shown in FIG6 , when the foldable display device 1 is in the second state (fully folded state), the stretching assembly 5 and the first shell 2 are overlapped with each other (specifically, the stretching assembly 5 slides in a direction close to the first shell 2 to overlap, or the first shell 2 slides in a direction close to the stretching assembly 5 to overlap), and the second shell 3 and the stretching assembly 5 are folded with each other (specifically, the second shell 3 and the stretching assembly 5 are rotated to fold by the first rotating assembly 6); the first display portion 9 and the second display portion 10 are laid on the same side of the second shell 3 and the first shell 2, and the first display portion 9 and the second display portion 10 are also folded with each other, and the first display The first display portion 9 corresponds to the second shell 3, the second display portion 10 corresponds to the first shell 2 (or the stretching component 5), and the third display portion 11 is rolled up in the first storage cavity 8 by the rolling component 4. At this time, the first display portion 9, the second display portion 10 and the third display portion 11 are all in a non-display state; it should be noted that the first display portion 9 and the second display portion 10 can be in an inner folding state or an outer folding state, wherein in the inner folding state, the first display portion 9 and the second display portion 10 are folded between the stretching component 5 and the second shell 3, and in the outer folding state, the first display portion 9 and the second display portion 10 are folded on the outside of the stretching component 5 and the second shell 3.

During the process of folding the second shell 3 and the stretching assembly 5, the first display portion 9 and the second display portion 10 are also folded correspondingly to each other, and the winding assembly 4 and the stretching assembly 5 can automatically adjust the curling length of the third display portion 11, that is, adjust the length of the flexible display assembly 7 located outside the first storage cavity 8. For example, when the first display portion 9 and the second display portion 10 are folded inwardly, the overall length of the stretching assembly 5, the first rotating assembly 6 and the side (inner side) of the second shell 3 close to the flexible display assembly 7 is less than the total length of the corresponding first display portion 9 and the second display portion 10. The automatic winding function of the winding assembly 4 can increase the length of the third display portion 11 curled on the winding assembly 4 to reduce the length of the first display portion 9 and the second display portion 10 corresponding to the second shell 3, the stretching assembly 5 and the first rotating assembly 6, so as to avoid the bending parts of the first display portion 9 and the second display portion 10 from being stacked and wrinkled due to insufficient space for placement; when the first display portion 9 and the second display portion 10 are folded inwardly, the first display portion 9 and the second display portion 10 are folded inwardly, and the bending parts of the first display portion 9 and the second display portion 10 are folded inwardly. When the display part 9 and the second display part 10 are folded outward, the overall length of the stretching component 5, the first rotating component 6 and the second shell 3 on one side (outside) close to the flexible display component 7 is greater than the total length of the corresponding first display part 9 and the second display part 10. The stretching component 5 slides in the direction away from the first shell 2 to drive the winding component 4 to rotate and stretch out part of the third display part 11, so as to reduce the length of the third display part 11 curled on the winding component 4, thereby increasing the length of the flexible display component 7 corresponding to the second shell 3, the stretching component 5 and the first rotating component 6, so as to avoid the first display part 9 and the second display part 10 from rupture due to excessive stretching.

If the area of the flexible display component 7 corresponding to the first shell 2 is taken as the unit display area, and the length of the first shell 2 is equal to the length of the stretching component 5, the first sub-shell 28 and the second sub-shell 29, then the display areas of the first display part 9, the second display part 10 and the third display part 11 are equal, which are equivalent to the unit display area; then, when the stretching component 5 is partially stretched out, and the stretching component 5 and the second shell 3 are unfolded, the foldable display device 1 has 2 times the unit display area; when the first shell 2, the stretching component 5 and the second shell 3 are fully unfolded, the foldable display device 1 has 3 times the unit display area. It should be noted that after the stretching component 5 is fully stretched out, the display area can also be expanded to 4 times the unit display area, which is specifically determined by the structure of the stretching component 5 and the first shell 2, and the specific expansion multiple of the display area is not limited here.

In this embodiment, when the foldable display device 1 is fully unfolded, the first shell 2, the stretching assembly 5 and the second shell 3 are unfolded from each other, and the flexible display assembly 7 (the third display portion 11) located in the first storage cavity 8 of the first shell 2 is stretched out, so that the flexible display assembly 7 is unfolded on the first shell 2, the stretching assembly 5 and the second shell 3, effectively increasing the display area, and the elastic tension provided by the winding assembly 4 to the flexible display assembly 7 at this time is conducive to keeping the flexible display assembly 7 in a flat state, which can improve the display effect; when the foldable display device 1 is folded and stored, the stretching assembly 5 is overlapped with the first shell 2, and the second shell 3 and the stretching assembly 5 are folded, a part of the flexible display assembly 7 (the first display portion 9 and the second display portion 10) is folded, and the other part (the third display portion 11) is curled in the first storage cavity 8, and the winding assembly 4 and the stretching assembly 5 can automatically adjust the curling length of the flexible display assembly 7, thereby adjusting the length of the flexible display assembly 7 of the folded part, and preventing the flexible display assembly 7 from being damaged during the folding process due to the change in the overall length of the stretching assembly 5, the first rotating assembly 6 and the second shell 3 surface.

Therefore, on the one hand, the present application enables the foldable display device 1 with a larger display area to present a smaller volume when folded and stored, which is convenient for carrying; on the other hand, the rolling component 4 can not only maintain the flat state of the flexible display component 7 when the foldable display device 1 is unfolded, but also adjust the curling length of the flexible display component 7 when the foldable display device 1 is folded to automatically compensate for the length of the folded part of the flexible display component 7, thereby avoiding damage to the flexible display component 7 when folded; and the automatic compensation function of the rolling component 4 and the stretching component 5 in the foldable display device 1 can make the structural design of the first rotating component 6 simpler, greatly reducing the production cost and efficiency; in addition, the foldable display device 1 of the present application has a larger display area and a smaller storage volume, and can be used as an electronic map, etc. The larger display area can see the terrain and layout more clearly, and the smaller storage volume is convenient to carry and has a wide range of applications.

This embodiment is optional, as shown in Figure 3, a first opening 15 communicating with the first receiving cavity 8 is provided on a side of the first shell 2 away from the second shell 3; an end of the third display portion 11 away from the second display portion 10 is connected to the winding assembly 4 through the first opening 15; the first shell 2 is also provided with a second opening 16 on a side away from the first opening 15, the second opening 16 is communicated with the first receiving cavity 8, and the stretching assembly 5 is received in the first receiving cavity 8 through the second opening 16 so as to overlap with the first shell 2.

Specifically, the first opening 15 may be located on the upper surface of the first shell 2 and at one end away from the second shell 3 , or may be located on the side of the first shell 2 , and the specific location is not limited here.

Specifically, the stretching assembly 5 may include a stretching body, and sliders (not shown in the figure) disposed on both sides of the stretching body; a slide rail is disposed inside the side wall of the first shell 2 corresponding to the slider, and the slider can slide on the slide rail, so that the stretching assembly 5 and the first shell 2 are slidably connected (or, slide rails are disposed on both sides of the stretching body, and sliders are disposed inside the side wall of the first shell 2 corresponding to the slide rail, and the slider can slide on the slide rail, so that the stretching assembly 5 and the first shell 2 are slidably connected); and a limiting structure is disposed on the side of the stretching body away from the second shell 3 and the side of the first shell 2 close to the second shell 3, which is used to fix the stretching assembly 5 on the side of the first shell 2 close to the second shell 3 when the foldable display device 1 is fully unfolded. The stretching assembly 5 can also be a comb-tooth structure, and correspondingly, the support structure of the first shell 2 close to the flexible display assembly 7 is also a comb-tooth structure, and the first shell 2 and the stretching assembly 5 are slidably connected through the comb-tooth structure. Of course, the stretching assembly 5 can also be other structures that can be slidably connected to the first shell 2, and the structures of the stretching assembly 5 and the first shell 2 conceived in this application are all within the protection scope of this application.

Specifically, as shown in Fig. 3 and Fig. 4, the winding assembly 4 includes a coil spring 17, which is located in the first storage cavity 8 and connected to the first shell 2, and one end of the flexible display assembly 7 extending into the first storage cavity 8 is connected to the coil spring 17. The winding assembly 4 may also include a roller 18 whose axis is parallel to the coil spring 17, and the number of rollers 18 may be one or more; when the number of rollers 18 is one, the roller 18 is located between the first opening 15 and the coil spring 17, and the end of the third display portion 11 away from the second display portion 10 passes through the first opening 15 and bypasses the roller 18 to connect to the coil spring 17; when the number of rollers 18 is more than one, the radius of each roller 18 is different, for example, as shown in Fig. 4, the winding assembly 4 also includes a roller with a larger radius. The first roller 19 and the second roller 20 with a smaller radius, wherein the axes of the first roller 19 and the second roller 20 are parallel to the coil spring 17, the coil spring 17 is located between the first roller 19 and the second roller 20, the first roller 19, the coil spring 17 and the second roller 20 are arranged at intervals, the first roller 19 is located between the first opening 15 and the coil spring 17, and the end of the third display part 11 away from the second display part 10 passes through the first opening 15 and the first roller 19 and the second roller 20 in turn and is connected to the coil spring 17. In addition, the gap formed by the winding assembly 4 can also be used to place the system circuit board and battery of the display device, making full use of the free space, which is conducive to reducing the volume of the first shell 2 and the second shell 3, and is convenient for storage.

In this embodiment, when the foldable display device 1 is unfolded, the stretching component 5 slides through the second opening 16 in a direction away from the first shell 2, driving the winding component 4 to rotate in the first direction (for example, clockwise), and stretching the third display portion 11 out of the first opening 15; when the foldable display device 1 is folded, the stretching component 5 slides through the second opening 16 in a direction close to the first shell 2, and finally slides into the first storage cavity 8. During this process, through the automatic winding action of the winding component 4, the winding component 4 rotates in the second direction (for example, counterclockwise), and the third display portion 11 is rolled up in the first storage cavity 8.

In this embodiment, as shown in FIG7, the first rotating assembly 6 includes a first rotating shaft 21 and a second rotating shaft 22 arranged side by side, and a first connecting member 23 and a second connecting member 24 located at both ends of the first rotating shaft 21 and the second rotating shaft 22, and the two ends of the first rotating shaft 21 are respectively rotatably connected to the first connecting member 23 and the second connecting member 24, and the two ends of the second rotating shaft 22 are respectively rotatably connected to the first connecting member 23 and the second connecting member 24; the side of the stretching assembly 5 close to the second shell 3 is fixedly connected to the first rotating shaft 21, and the side of the second shell 3 close to the stretching assembly 5 is fixedly connected to the two ends of the second rotating shaft 22. Alternatively, as shown in FIG8, the first rotating assembly 6 includes a first rotating shaft 21 and a first connecting member 23 and a second connecting member 24 located at both ends of the first rotating shaft 21, and the two ends of the first rotating shaft 21 are respectively rotatably connected to the first connecting member 23 and the second connecting member 24; the side of the stretching assembly 5 close to the second shell 3 is fixedly connected to the first rotating shaft 21, and the side of the second shell 3 close to the stretching assembly 5 is fixedly connected to the first connecting member 23 and the second connecting member 24.

In this embodiment, compared with the technical solution of compensating the overall length of the surface of the stretching component 5 and the second shell 3 during the folding process through the complex structural design of the first rotating component 6 or the complex design of the shell structure, the automatic compensation function of the winding component 4 and the stretching component 5 in the foldable display device 1 can make the structural design of the first rotating component 6 simpler, greatly reduce the production cost and improve the production efficiency.

As shown in Figure 9, the embodiment of the present application also provides a foldable display device 1, which is different from the above embodiment in that a third opening 25 is provided on the side of the stretching component 5 away from the second shell 3, and the stretching component 5 is also provided with a second storage cavity 26 connected to the third opening 25. The first shell 2 is received in the second storage cavity 26 through the third opening 25 so as to overlap with the stretching component 5.

Specifically, the first shell 2 and the stretching assembly 5 are connected in a "drawer-type" sliding manner. The stretching assembly 5 can also be other structures that can be slidably connected to the first shell 2. The structures of the stretching assembly 5 and the first shell 2 that are suitable for the present application are all within the protection scope of the present application.

In this embodiment, when the foldable display device 1 is unfolded, the first shell 2 slides through the third opening 25 in a direction away from the stretching assembly 5, driving the winding assembly 4 to rotate in the first direction (for example, clockwise), and stretching the third display portion 11 out of the first opening 15; when the foldable display device 1 is folded, the first shell 2 slides through the third opening 25 in a direction close to the stretching assembly 5, and finally slides into the second storage cavity 26. During this process, through the automatic winding action of the winding assembly 4, the winding assembly 4 rotates in the second direction (for example, counterclockwise), and the third display portion 11 is rolled up in the first storage cavity 8.

As shown in FIG. 10 , the embodiment of the present application further provides a foldable display device 1 , which is different from the above embodiment in that an LCD (Liquid Crystal Display) display screen 27 is provided on a side of the second shell 3 away from the flexible display assembly 7 .

Specifically, the first display portion 9 and the second display portion 10 are in an inwardly folded state when folded, that is, the first display portion 9 and the second display portion 10 are folded with each other and are located between the second housing 3 and the stretching assembly 5 which are folded with each other.

Specifically, the LCD display screen 27 may be packaged using rigid glass.

Specifically, the LCD display screen 27 may also be disposed on a side of the first housing 2 away from the flexible display assembly 7 , which is not limited here.

In this embodiment, since the flexible display component 7 is a flexible structure, the first display part 9 and the second display part 10 of the foldable display device 1 are folded inwardly, and the first display part 9 and the second display part 10 of the flexible display component 7 can be protected between the second shell 3 and the stretching component 5 when stored (the third display part 11 is located in the first storage cavity 8 and protected by the first shell 2), so as to prevent the flexible display component 7 from being scratched or damaged by external impact; in addition, a rigid LCD display screen 27 is provided on the side of the second shell 3 away from the flexible display component 7, and when the foldable display device 1 is folded, it still has a controllable interface, so that the foldable display device 1 in the present application can be used in environments with harsh conditions, thereby expanding the application range of the product.

As shown in FIGS. 11 to 14 , the embodiment of the present application also provides a foldable display device 1 , which is different from the above embodiment in that the second housing 3 includes a plurality of sub-housings arranged in sequence, and any two adjacent sub-housings are rotationally connected through a second rotating assembly 30 , and the number of sub-housings is not shown here. For example, the second housing 3 includes a first sub-housing 28 , a second sub-housing 29 , and a second rotating assembly 30 located between the first sub-housing 28 and the second sub-housing 29 ; the first sub-housing 28 is rotationally connected to the second sub-housing 29 through the second rotating assembly 30 ; the first sub-housing 28 is also connected to the first rotating assembly 6 , and the first sub-housing 28 is also rotationally connected to the stretching assembly 5 through the first rotating assembly 6 .

Specifically, as shown in Figure 12, the first display unit 9 includes a first sub-display unit 31 and a second sub-display unit 32 that are adjacent to each other. The first sub-display unit 31 is located between the second display unit 10 and the second sub-display unit 32. The first sub-display unit 31 is arranged corresponding to the first sub-shell 28, and the second sub-display unit 32 is arranged corresponding to the second sub-shell 29.

As shown in Figure 12, when the foldable display device 1 is in the first state (fully expanded state), the stretching component 5 and the first shell 2 are deployed with each other, and the first sub-shell 28, the second sub-shell 29 and the stretching component 5 are all deployed; the flexible display component 7 is laid on the same side of the first sub-shell 28, the second sub-shell 29, the stretching component 5 and the first shell 2, and the first sub-display portion 31 corresponds to the first sub-shell 28, the second sub-display portion 32 corresponds to the second sub-shell 29, the second display portion 10 corresponds to the stretching component 5, and the third display portion 11 corresponds to the first shell 2.

As shown in Figure 13, when the foldable display device 1 is in the second state (fully folded state), the stretching component 5 and the first shell 2 are overlapped, the first sub-shell 28 and the stretching component 5 are folded, and the second sub-shell 29 and the first sub-shell 28 are folded; the first sub-display part 31, the second sub-display part 32 and the second display part 10 are laid on the same side of the second sub-shell 29, the first sub-shell 28 and the first shell 2, and the first sub-display part 31 corresponds to the first sub-shell 28, the second sub-display part 32 corresponds to the second sub-shell 29, the second display part 10 corresponds to the first shell 2 (or the stretching component 5), and the third display part 11 is rolled up by the rolling component 4 in the first storage cavity 8.

Specifically, the second rotating assembly 30 includes an inner folding rotating assembly and an outer folding rotating assembly, and also includes a rotating assembly that can be folded both inwardly and outwardly; the structure of the second rotating assembly 30 and the first rotating assembly 6 can be the same or different, and there is no limitation here.

Specifically, when the foldable display device 1 is in the second state, the stretching assembly 5, the first sub-shell 28 and the second sub-shell 29 can be stacked in a Z-shape, and can certainly be folded in other forms, which is not limited here.

As shown in Figure 14, when the foldable display device 1 is in the third state (semi-expanded state), the stretching component 5 and the first shell 2 are overlapped with each other, the second shell 3 and the stretching component 5 are rotated to a preset angle θ, and the first sub-shell 28 and the second sub-shell 29 are unfolded with each other; the flexible display component 7 is laid on the same side of the first shell 2, the first sub-shell 28, and the second sub-shell 29, the first sub-display part 31 corresponds to the first sub-shell 28, the second sub-display part 32 corresponds to the second sub-shell 29, the second display part 10 corresponds to the first shell 2 (or the stretching component 5), and the third display part 11 is rolled up by the rolling component 4 in the first storage cavity 8.

Specifically, the preset angle θ ranges from 60 degrees to 120 degrees. For example, when the preset angle θ is 90 degrees, the second shell 3 (including the first sub-shell 28 and the second sub-shell 29) is vertically arranged with the first shell 2 (or the stretching component 5), and the foldable display device 1 can place and use the first shell 2 as a base. At this time, the third display part 11 is located on the first shell 2 and can be used as an operation interface, such as a virtual keyboard. The first character display part is located on the first sub-shell 28, and the second character display part is located on the second sub-shell 29. The first sub-display part 31 and the second sub-display part 32 can be used as display interfaces to facilitate users to use in various styles.

In this embodiment, if the area of the flexible display component 7 corresponding to the first shell 2 is taken as the unit display area, and the length of the first shell 2 is respectively equal to the length of the stretching component 5, the first sub-shell 28 and the second sub-shell 29, then the display areas of the first sub-display portion 31, the second sub-display portion 32, the second display portion 10 and the third display portion 11 are equal, all equivalent to the unit display area; then, when the foldable display device 1 is fully unfolded, it has 4 times the unit display area, and when it is stored, it only has a storage area corresponding to the unit display area, and the overall volume is small, which is easy to carry; and, when the foldable display component is folded, the flexible display component 7 is folded twice, and when it is unfolded and used next time, it is easy to wrinkle or warp out of the shell, which is not conducive to improving the display effect, and the winding component 4 of the present application has the function of automatic winding, When the flexible display component 7 is unfolded, a pulling force can be provided to the flexible display component 7 to retract into the first storage cavity 8, which is beneficial to ensure that the flexible display component 7 remains flat, thereby improving the display effect; in addition, during the folding process of the flexible display component 7, the stretching component 5 and the winding component 4 can also automatically compensate for the length of the folded part of the flexible display component 7, which is beneficial to protecting the flexible display component 7, and is beneficial to simplifying the structure of the first rotating component 6, thereby avoiding the first rotating component 6 protecting the folded part of the flexible display component 7 through a complex structure; more importantly, when the second shell 3 includes more than two sub-shells, the foldable display component has at least 4 times the unit display area, and can be used as an electronic map, etc. The larger display area can more clearly see the terrain and layout, and the smaller storage volume is small and convenient for storage, and is widely used.

In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims (8)

1. A foldable display device, characterized in that it comprises a first shell with a first storage cavity disposed therein, a winding assembly disposed in the first storage cavity, a stretching assembly slidably connected to the first shell, a first rotating assembly connected to an end of the stretching assembly away from the first shell, a second shell connected to the first rotating assembly, and a flexible display assembly having a part disposed on the same side of the first shell and the second shell and another part extending into the first storage cavity and connected to the winding assembly; wherein the second shell is rotationally connected to the stretching assembly via the first rotating assembly; When the flexible display assembly in the first receiving cavity is stretched out, the rolling assembly provides a retracting elastic pulling force for the flexible display assembly; The flexible display assembly includes a first display portion, a second display portion, and a third display portion which are arranged adjacent to each other in sequence; the first display portion is arranged on one side of the second shell, and an end of the first display portion away from the second display portion is connected to the second shell, and an end of the third display portion away from the second display portion is connected to the winding assembly; A first opening communicating with the first storage cavity is provided on a side of the first shell away from the second shell; an end of the third display portion away from the second display portion is connected to the winding assembly through the first opening; The stretching assembly is provided with a third opening on a side away from the second shell, and the stretching assembly is also provided with a second receiving cavity communicated with the third opening, and the first shell is received in the second receiving cavity through the third opening to overlap with the stretching assembly; The second housing comprises a first sub-housing, a second sub-housing and a second rotating assembly located between the first sub-housing and the second sub-housing; the first sub-housing is rotatably connected to the second sub-housing via the second rotating assembly; the first sub-housing is also connected to the first rotating assembly, and the first sub-housing is also rotatably connected to the stretching assembly via the first rotating assembly; The first display portion includes a first sub-display portion and a second sub-display portion that are adjacently arranged, the first sub-display portion is located between the second display portion and the second sub-display portion, the first sub-display portion is arranged corresponding to the first sub-housing, and the second sub-display portion is arranged corresponding to the second sub-housing; When the foldable display device is in a first state, the stretching assembly and the first shell are unfolded with each other, and the first sub-shell, the second sub-shell and the stretching assembly are all unfolded; the flexible display assembly is laid on the same side of the first sub-shell, the second sub-shell, the stretching assembly and the first shell, and the first sub-display part corresponds to the first sub-shell, the second sub-display part corresponds to the second sub-shell, the second display part corresponds to the stretching assembly, and the third display part corresponds to the first shell; the first sub-shell, the second sub-shell, the stretching assembly and the first shell provide support for the first sub-display part, the second sub-display part, the second display part and the third display part, respectively. 2. The foldable display device according to claim 1, characterized in that when the foldable display device is in the second state, the stretching assembly and the first shell are overlapped with each other, the first sub-shell and the stretching assembly are folded with each other, and the second sub-shell and the first sub-shell are folded with each other; The first sub-display portion, the second sub-display portion and the second display portion are laid on the same side of the second sub-shell, the first sub-shell and the first shell, and the first sub-display portion corresponds to the first sub-shell, the second sub-display portion corresponds to the second sub-shell, the second display portion corresponds to the first shell, and the third display portion is rolled up in the first storage cavity by the rolling assembly. 3. The foldable display device according to claim 2, characterized in that when the foldable display device is in the second state, the stretching assembly, the first sub-shell and the second sub-shell are stacked in a Z-shape. 4. The foldable display device according to claim 1, characterized in that when the foldable display device is in the third state, the stretching assembly and the first shell are overlapped with each other, the second shell and the stretching assembly are rotated to form a preset angle, and the first sub-shell and the second sub-shell are unfolded with each other; The flexible display component is laid on the same side of the first shell, the first sub-shell, and the second sub-shell, the first sub-display portion corresponds to the first sub-shell, the second sub-display portion corresponds to the second sub-shell, the second display portion corresponds to the first shell, and the third display portion is rolled up in the first storage cavity by the rolling component. 5. The foldable display device according to claim 4, wherein the preset angle ranges from 60 degrees to 120 degrees. 6. The foldable display device according to claim 1, characterized in that the rolling component includes a coil spring, the coil spring is located in the first storage cavity and connected to the first shell, and one end of the flexible display component extending into the first storage cavity is connected to the coil spring. 7. The foldable display device according to claim 1, wherein the first rotating assembly comprises a first rotating shaft and a second rotating shaft arranged side by side, and a first connecting member and a second connecting member located at both ends of the first rotating shaft and the second rotating shaft, the two ends of the first rotating shaft are rotatably connected to the first connecting member and the second connecting member respectively, and the two ends of the second rotating shaft are rotatably connected to the first connecting member and the second connecting member respectively; A side of the stretching assembly close to the second shell is fixedly connected to the first rotating shaft, and a side of the second shell close to the stretching assembly is fixedly connected to both ends of the second rotating shaft. 8. The foldable display device according to claim 1, wherein an LCD display screen is provided on a side of the second housing away from the flexible display assembly.