CN113963625B

CN113963625B - Foldable display device

Info

Publication number: CN113963625B
Application number: CN202111248375.6A
Authority: CN
Inventors: 张雯
Original assignee: Wuhan Tianma Microelectronics Co Ltd
Current assignee: Wuhan Tianma Microelectronics Co Ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2023-07-07
Anticipated expiration: 2041-10-26
Also published as: CN113963625A

Abstract

The embodiment of the invention discloses a foldable display device, which comprises: at least two display screens and at least one projection module; two adjacent display screens are connected through a projection module, and each display screen is movably connected with the projection module; the projection module comprises a projection screen and a projection lens, wherein the projection screen comprises a first groove positioned at one side away from the light-emitting surface; the projection lens is positioned at the first groove; the display pictures presented by the display screens and the projection pictures emitted by the projection screens are spliced into complete pictures. The embodiment of the invention can ensure that the foldable display device can display smooth and complete pictures and improve the display effect of the foldable display device on the premise of ensuring that the foldable display device has longer service life and higher durability.

Description

Foldable display device

Technical Field

The invention relates to the technical field of display, in particular to a foldable display device.

Background

At present, the research on folding screens is mostly based on Organic Light-Emitting Diode (OLED) display screens, but the repeated bending of the OLED display screens can cause risks such as broken lines and the like in bending areas of the OLED display screens, so that the folding screens have the problems of short service life and low durability; for the liquid crystal display (Liquid Crystal Display, LCD), the liquid crystal display is composed of a backlight module and a liquid crystal display panel, so that the liquid crystal display is difficult to bend at a large angle, and therefore cannot be widely applied to the foldable screen. Accordingly, there is a need for a foldable display device having a long service life and high durability.

Disclosure of Invention

In view of the above, the embodiment of the invention provides a foldable display device, so as to ensure the integrity of the displayed image on the premise of having the advantages of long service life, high durability and the like.

An embodiment of the present invention provides a foldable display device, including: at least two display screens and at least one projection module;

two adjacent display screens are connected through the projection module, and each display screen is movably connected with the projection module;

the projection module comprises a projection screen and a projection lens, and the projection screen comprises a first groove positioned at one side away from the light emergent surface; the projection lens is positioned at the first groove;

the display pictures presented by the display screens and the projection pictures emitted by the projection screens are spliced into complete pictures.

According to the embodiment of the invention, at least two display screens are movably connected with at least one projection module, so that the display screens can move around the projection module as an axis, the foldable display device can be folded or unfolded, and the circuit and the film layer structure inside the display screens are not influenced, so that the service life of the foldable display device can be prolonged; meanwhile, at least two display screens are movably connected through at least one projection module, and the projection module is composed of a projection screen and a projection lens arranged in a first groove in the projection screen, the projection lens can project a projection picture onto the projection screen to enable the projection picture to be displayed on the projection screen, at the moment, the projection picture presented by the projection screen can be spliced with a display picture presented by the display screen to form a complete picture, so that the picture display integrity of the foldable display screen can be ensured, and further the improvement of the display effect of the foldable display screen is facilitated.

Drawings

Fig. 1 is a schematic structural view of a foldable display device of the related art;

fig. 2 is a schematic top view of a foldable display device according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of another foldable display device according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention;

FIG. 6 is a schematic view of a partial enlarged structure corresponding to FIG. 5 according to an embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention;

fig. 8 is a schematic top view of another foldable display device according to an embodiment of the present invention;

fig. 9 is a schematic top view of still another foldable display device according to an embodiment of the invention.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

Fig. 1 is a schematic structural view of a related art foldable display device, as shown in fig. 1, which includes a bending structure 11 and display screens 12 positioned at both sides of the bending structure 11, so that the foldable display device can realize a foldable function by bending or unfolding the bending structure 11. When the foldable display device displays, the display screens 12 located at two sides of the bending structure 11 respectively display corresponding pictures, but the bending structure 11 located between the two display screens 12 has no display function, so that the position of the bending structure 11 between the two display screens 12 is displayed as a display dark area, thereby destroying the integrity of the pictures displayed by the foldable display device. In the prior art, the supplemental light source 111 is disposed at the position of the bending structure 11 to increase the display brightness at the position of the bending structure 11, but the integrity and fluency of the whole display cannot be ensured.

In view of the foregoing, embodiments of the present invention provide a foldable display device including: at least two display screens and at least one projection module; two adjacent display screens are connected through a projection module, and each display screen is movably connected with the projection module; the projection module comprises a projection screen and a projection lens, wherein the projection screen comprises a first groove positioned at one side away from the light-emitting surface; the projection lens is positioned at the first groove; the display pictures presented by the display screens and the projection pictures emitted by the projection screens are spliced into complete pictures.

By adopting the technical scheme, at least two display screens are movably connected with at least one projection module, so that the display screens can move around the projection module as an axis, the foldable display device can be folded or unfolded, and the circuit and the film layer structure inside the display screens can not be influenced, so that the service life of the foldable display device can be prolonged; meanwhile, at least two display screens are movably connected through at least one projection module, and the projection module is composed of a projection screen and a projection lens arranged in a first groove in the projection screen, the projection lens can project a projection picture onto the projection screen to enable the projection picture to be displayed on the projection screen, at the moment, the projection picture presented by the projection screen can be spliced with a display picture presented by the display screen to form a complete picture, so that the picture display integrity of the foldable display screen can be ensured, and further the improvement of the display effect of the foldable display screen is facilitated.

The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.

It should be noted that, in the embodiment of the present invention, there may be multiple display screens in the foldable display device, and there may also be multiple projection modules connected to each display screen, so that a plurality of display screens and multiple photographic modules are spliced together to present a complete display screen. In order to facilitate description of a specific structure of the foldable display device, the embodiment of the invention takes the foldable display device including two display screens and a projection module as an example, and the technical scheme of the embodiment of the invention is exemplarily described on the premise that no specific description is given.

Fig. 2 is a schematic top view of a foldable display device according to an embodiment of the present invention, and fig. 3 is a schematic cross-sectional view of a foldable display device according to an embodiment of the present invention, where, as shown in fig. 2 and fig. 3, the foldable display device at least includes two display screens 10 and a photographing module 20, and two adjacent display screens 10 are movably connected through the projection module 20; the projection module 20 includes a projection screen 201 and a projection lens 202, wherein the projection screen 201 includes a first recess 2012 located at a side facing away from the light-emitting surface 2011; the projection lens 202 is located at the first recess 2012; the display frames presented by the display screens 10 and the projection frames emitted by the projection screen 201 are spliced into complete frames.

The light-emitting surface 2011 of the projection screen 201 is a surface of the projection screen 201 that presents a projection image and can be observed by human eyes; on the contrary, the side facing away from the light-emitting surface 2011 is the side where the projection screen is not displayed. Correspondingly, the two display screens 10 and the photographing module 20 are movably connected, specifically, the two display screens 10 and the projection module 20 are rotatably connected, at this time, the two display screens can rotate around the projection module 20, and at this time, the projection module 20 can be used as a rotating shaft of the display screen 10. To ensure that the two display screens 10 can rotate around the projection module 20, the projection module may have a cylindrical structure or a structure similar to a cylindrical shape, so as to ensure smooth and flexible rotation of the display screens 10 around the photographing module 20.

Specifically, referring to fig. 3, the two display screens 10 can rotate around the projection module 20 respectively, so that the foldable display device can present different states. When the foldable display device is in an unfolded state, that is, when the two display screens 10 are in a state shown by solid lines in fig. 3, the frame displayed by the foldable display device may be divided into three areas, for example, a first area, a second area and a third area from left to right, where the display frame presented by the leftmost display screen 10 is the frame of the first area, the projection frame emitted by the projection module 20 is the frame of the second area, and the display frame presented by the rightmost display screen 10 is the frame of the third area, so that the display frames presented by the two display screens 10 and the projection frame emitted by the projection module 20 may be spliced into a complete frame. When the foldable display device is in a folded state, that is, when the two display screens 10 are in a state shown by the dashed lines in fig. 3, each display screen 10 in the foldable display device can independently display different images, at this time, the projected image emitted by the projection module 20 and the display image presented by one of the display screens 10 can form a complete image so as to increase the display area of the image, or the projection module 20 can also be used only as a supplementary light source; or, the frame displayed by the foldable display device may be divided into three areas, which are the same as the display condition when the foldable display device is in the unfolded state, and will not be described herein. When the foldable display device is in a state between the unfolded state and the folded state, the images presented by each display screen 10 and the projection module 20 can be determined by the included angle between the display surfaces 1011 of the two display screens, for example, when the foldable display device is switched from the unfolded state to the folded state, the included angle between the display surfaces 1011 of the two display screens 10 is smaller and smaller, and at this time, the display images presented by the two display screens 10 can be gradually changed from an integral image to two independent display images along with the change of the included angle between the display surfaces 1011 of the two display screens 10. The display surface 1011 of the display screen 10 is a surface that presents a display screen and can be observed by human eyes, and is oriented in accordance with the light-emitting surface 2011 of the projection module 20.

It can be understood that a corresponding state sensing sensor may be disposed in the foldable display device to obtain the state of each display screen 10, or a linkage structure linked with each display screen 10 is disposed to feed back the state of each display screen 10, so that the content of the frame presented by each display screen 10 and the projection module 20 can be adjusted according to the state of each display screen 10. At this time, each display screen 10 and the projection module 20 may share one driving chip, and the driving chip distributes data signals to each pixel in each display screen 10 and distributes projection signals to the projection lens 202 in the projection module 20; or, independent driving chips are respectively arranged in each display screen 10 and the projection module 20, at this time, data signals can be respectively distributed to the driving chips of each display screen 10 and the projection module by the system main board of the foldable display device, so that the driving chips in each display screen 10 drive the corresponding display screen 10 to display corresponding pictures, and the driving chips in the projection module 20 drive the projection lens 202 to emit corresponding projection pictures, thus, according to the state of the foldable display device, each display screen 10 and the projection module 20 can be controlled to display.

It should be noted that, in the embodiment of the present invention, the material of the projection screen 201 may be a transparent hard screen or a soft screen, the contrast of the embodiment of the present invention is not limited in particular, the number of the projection lenses 202 may be one or more, and the embodiment of the present invention also does not limit in particular the number of the projection lenses 202 on the premise that the display frames presented by each display screen 10 and the projection frames emitted by the projection film set 20 are spliced into a complete frame in any form of the foldable display device.

Alternatively, with continued reference to fig. 3, when the foldable display device is switched from the unfolded state to the folded state, the projection lens 202 moves to a side away from the projection screen 201 at the first recess 2012; alternatively, when the foldable display device is switched from the folded state to the unfolded state, the projection lens 202 moves to the side close to the projection screen 201 at the first recess 2012.

Specifically, since the light emitting angle of the projection lens 202 is fixed, the light emitting angle is the maximum range of the light emitted from the projection lens 202 to the projection screen 201, for example, the light emitting angle is 120 degrees. Therefore, when the foldable display device is switched from the unfolded state to the folded state, the area of the light-emitting surface 2011 of the projection screen 201 connected between the two display screens 10 is gradually increased, so as to ensure that the light-emitting surface of the projection module 20 and the display surface of the display screen 10 can be spliced into a complete image, the projection lens 202 located at the first groove 2012 can be controlled to gradually move to a side far from the light-emitting surface 2011, so that the coverage range of the light emitted by the projection lens 202 is gradually increased after reaching the light-emitting surface 2011. In contrast, when the foldable display device is switched from the folded state to the unfolded state, the projection lens 202 can be controlled to gradually move to the side close to the light emitting surface 2011, so that the coverage range is gradually reduced after the light emitted by the projection lens 202 reaches the light emitting surface 2011. In this way, the projection lens 202 can be controlled to move in the first recess 2012, so that when the foldable display device is in different states, the range of the light emitting surface 2011 covered by the light emitted by the projection lens 202 is controlled to be different, thereby ensuring the integrity and fluency of the image displayed by the foldable display device.

Optionally, with continued reference to fig. 3, when the foldable display device is in the unfolded state, two adjacent display screens 10 are in contact, and the display surfaces of the display screens 10 that are in contact are flush, so that when the display device is in the unfolded state, it is ensured that the display surfaces of all the display screens 10 are spliced into a complete display surface, flatness of the whole display device is ensured, and the displayed image is ensured to have integrity and smoothness, so that the display effect is improved.

Optionally, fig. 4 is a schematic cross-sectional structure of another foldable display device according to an embodiment of the present invention, as shown in fig. 4, each display screen 10 includes a backlight module 101, a liquid crystal display panel 102, and a cover plate 103 that are sequentially stacked; a gap is formed between the liquid crystal display panels 102 of two adjacent display screens 10; the cover plate 103 is movably connected with the projection module 20.

The backlight module 101 is configured to provide a backlight source for the liquid crystal display panel 102, for example, direct type or side-in type; the lcd panel 102 is used as a display, and at least includes a thin film transistor (Thin Film Transistor, TFT) array substrate, a liquid crystal layer and a Color Filter (CF) substrate, in which the liquid crystal layer is typically located between the TFT array substrate and the CF substrate, and corresponding driving voltages are applied to liquid crystal molecules at different positions in the liquid crystal layer by respective TFTs in the TFT array substrate, so as to control the rotation of the liquid crystal molecules in the liquid crystal layer, so that a backlight source provided by the backlight module 101 can pass through the TFT array substrate of the lcd panel, be refracted out from the liquid crystal layer of the lcd panel, and generate a Color picture through the CF substrate; the cover plate 103 is used for protecting the liquid crystal display panel 102, and may be a rigid Glass plate or a flexible plate made of a flexible material, that is, the cover plate 103 may be, for example, a Glass substrate, a flexible substrate made of a transparent polyimide film (Colourless Polyimide film, CPI), an Ultra-Thin Glass (UTG), or a combined composite substrate of CPI and UTG, which is not limited in particular in the embodiment of the present invention.

Specifically, a gap is formed between the liquid crystal display panels 102 of two adjacent display screens 10, so as to accommodate the projection module 20 connecting the two display screens 10; at this time, the cover plate 103 in the display screen 10 can be movably connected with the projection module 20, and on the premise of ensuring that the display screen is folded and rotated, other connecting structures are not required to be additionally arranged to connect the display screen 10 and the projection module 20, so that the structure of the foldable display device can be simplified, and the cost and the assembly difficulty of the foldable display device can be reduced.

When the foldable display device is in the unfolded state, if two adjacent display screens 10 are in contact and the display surfaces of the two adjacent display screens 10 are flush, the cover plates 103 of the two adjacent display screens 103 can be considered to be in contact and the display surfaces of the two adjacent cover plates 103 are flush; at this time, it is required that the cover plate 103 should have a certain thickness to ensure that the side edges of the cover plates 103 of the adjacent two display screens 10 can be fitted together.

Besides, each display screen 10 may further include an outer frame 104, where the backlight module 101 and the liquid crystal display panel 102 are both contained in the outer frame 104, so that the outer frame 104 can play a certain role in protecting the backlight module 101 and the liquid crystal display panel 102, and meanwhile, the outer frame 104 can also be used for supporting the cover plate 102 to provide a certain supporting force for the cover plate 103, so as to prevent the cover plate 103 from being deformed due to the influence of gravity.

Optionally, as shown in fig. 4, the light-emitting surface 2011 side of the projection screen 201 in each projection module 20 includes at least two arc-shaped side surfaces 20111 disposed opposite to each other; the side edge of the cover plate 103 comprises an arc-shaped groove 1031; portions of arcuate sides 20111 are embedded within arcuate grooves 1031.

Specifically, two opposite arc-shaped side surfaces 20111 are disposed on the light-emitting surface 2011 side of the projection screen 201, and arc-shaped grooves 1031 are disposed on the side edge of the cover plate 103, so that the two arc-shaped side surfaces 201111 on the light-emitting surface 2011 side of the projection screen 201 are respectively embedded with the arc-shaped grooves 1031 of the cover plates 10 of the two display screens 10, and the cover plate 103 can rotate along the arc-shaped side surfaces 20111. Therefore, the movable part arranged between the photographing module 20 and the display screen 10 can be reduced without additionally arranging a rotary connecting shaft, so that the structure of the small foldable display device is simplified, and the foldable display device has the advantage of miniaturization.

The radius of curvature of the arc-shaped groove 1031 may be the same as that of the arc-shaped side 20111, and the projection screen 201 and the cover plate 103 may be kept in a seamless fit state, so that the integrity of the image displayed by the foldable display device may be ensured on the premise that the cover plate 103 may perform more stable and smooth rotation.

Optionally, fig. 5 is a schematic cross-sectional structure of still another foldable display device according to an embodiment of the present invention, as shown in fig. 5, each of the arc-shaped side surfaces 20111 extends from the light-emitting surface 2011 to a side facing away from the light-emitting surface 2011; the arc-shaped side surface 20111 includes a first arc surface 20111' and a second arc surface 20111"; when the foldable display device is in an unfolded state, at least part of the first cambered surface 20111' is embedded in the cambered groove 1031; when the foldable display device is in the folded state, at least part of the second cambered surface 20111″ is embedded in the cambered groove 1031.

In this way, when the foldable display device is in the unfolded state, at least part of the first cambered surface 20111' is embedded in the arc-shaped groove 1031 of the cover plate 103, and when the foldable display screen 10 is in the folded state, at least part of the second cambered surface 20111″ is embedded in the arc-shaped groove 1031, so that the cover plate 103 and the projection screen 201 therein can be tightly attached together no matter the foldable display device is in the unfolded state or the folded state, and a small gap is formed between the projection screen 201 and the cover plate 103, thereby being beneficial to miniaturization of the foldable display device and ensuring the integrity of the displayed picture.

Optionally, the radius of curvature of the first cambered surface 20111' is the same as the radius of curvature of the second cambered surface 20111 ". In this way, when the foldable display device is switched from the unfolded state to the folded state, the arc-shaped groove 1031 of the cover plate 103 can be embedded with at least part of the first arc surface 20111', and smoothly transited to be embedded with at least part of the second arc surface 20111″; alternatively, when the foldable display device is switched from the folded state to the unfolded state, the arc-shaped groove 1031 of the cover plate 103 can be embedded from at least part of the second arc surface 20111″ to at least part of the first arc surface 20111'.

Alternatively, as shown in fig. 2 and 5, the first cambered surface 20111' and the second cambered surface 20111″ form a first step structure 20112; the vertical distance x1 from each point on the first arc 20111' to the axis 30 of the projection screen 201 is greater than the vertical distance x2 from each point on the second arc 20111″ to the axis 30 of the projection screen 201; wherein the axis 30 of the projection screen 201 is parallel to the display surface of the display screen 10 to which the projection screen 201 is attached.

Specifically, the vertical distance x1 between each point on the first arc surface 20111' and the axis 30 of the projection screen 201 is greater than the vertical distance x2 between each point on the second arc surface 20111″ and the axis 30 of the projection screen 201, i.e., the second arc surface 20111″ is recessed toward the side of the axis 30 near the projection screen 201 as compared with the first arc surface 20111', so that a first step structure 20111 2 is formed between the second arc surface 20111″ and the first arc surface 20111 '; when the foldable display device is in a folded state, the first step structure 20112 can accommodate the cover plate 103, so as to reduce the thickness of the whole foldable display device in the folded state; meanwhile, when the cover plate 103 is accommodated in the first step structure 20112, the display surface of the cover plate 103 and the light emitting surface of the projection screen 201 keep a relatively flat state.

Optionally, fig. 6 is a schematic diagram of a partial enlarged structure corresponding to fig. 5 provided in the embodiment of the present invention, and as shown in fig. 5 and fig. 6, the arc-shaped side surface 20111 further includes a connecting surface 20111' "; the connecting surface 20111' "includes a first side a and a second side b opposite each other; the first side a is connected with a first cambered surface 20111', and the second side b is connected with a second cambered surface 20111'; when the foldable display device is in a folded state, the side edge of the cover plate 103 contacts the connecting surface 20111' ", and the display surface of the cover plate 103 is flush with the first edge a.

Specifically, when the foldable display device is switched from the unfolded state to the folded state, the liquid crystal display panel 102 and the backlight module 101 in each display screen 10 are driven by the cover plate 103 thereof to rotate along the first cambered surface 20111', until each display screen 10 rotates to the connecting surface 20111' ", the cover plate 103 can be moved to the side close to the axis along the connecting surface 20111 '" by external force until the arc-shaped groove 1031 of the cover plate 103 is opposite to the second cambered surface 20111", and at least part of the second cambered surface 20111" is embedded in the arc-shaped groove 1031, so that the foldable display device is switched from the unfolded state to the folded state. Similarly, when the foldable display device is switched from the folded state to the unfolded state, the display screens 10 are moved away from the axis along the connecting surface 20111 '"by an external force, and then the display screens 10 are rotated along the first cambered surface 20111' until the adjacent display screens 10 are contacted, so that the foldable display device is switched from the folded state to the unfolded state.

Thus, when the foldable display device is in the folded state, the cover plate 103 can be completely accommodated in the first step structure 20112, and the display screen of the cover plate 103 and the light emitting surface of the projection screen 201 can form a smooth surface, so that the cover plate 103 protrudes compared with the projection screen 201, or the cover plate 103 is recessed compared with the projection screen 201, thereby affecting the aesthetic property of the foldable display device and the smoothness and integrity of the displayed image.

Optionally, fig. 7 is a schematic cross-sectional structure of another foldable display device according to an embodiment of the present invention, as shown in fig. 7, a light-emitting surface 2011 side of the projection screen 201 further includes a flat surface 20113 for connecting two oppositely disposed arc-shaped side surfaces 20111. At this time, when the foldable display device is in the unfolded state, whether the adjacent display screens 10 are in contact or not is not considered, so long as the display surface of the display screen 10 and the flat surface 20113 of the projection screen 201 movably connected with the display screen remain in a flush state, the foldable display device is ensured to have a flat surface; meanwhile, when the foldable display device is in the unfolded state, the two adjacent display screens 10 do not need to be in contact, namely, the cover plates 103 of the two adjacent display screens 10 do not need to be in contact, so that the side thicknesses of the cover plates 103 do not need to be considered, the cover plates 103 do not need to be large in thickness, further the thickness of the single display screen 10 is reduced, and further the light and thin foldable display device is facilitated.

Optionally, with continued reference to fig. 7, each display screen 10 further includes an outer frame 104; the outer frame 104 is used for supporting the cover plate 103 and accommodating the liquid crystal display panel 102 and the backlight module 101; a step structure is arranged on one side of the outer frame 104 close to the projection module 20; when the foldable display device is in a folded state, the step structures of two adjacent display screens 10 form a third groove 1041, and the third groove 1041 is opposite to the first groove 2012; the projection lens 202 moves in the first direction Y; when the foldable display device is in the unfolded state, the projection lens 202 is located in the first groove 2012; when the foldable display device is in the folded state, the projection lens 202 is located in the third groove 1041; the first direction Y is a direction intersecting the display surface 1011 of the display screen 10 when the foldable display device is in the unfolded state.

The outer frame 104 can be used for supporting the cover plate 103 and protecting the liquid crystal display panel 102 and the backlight module 101, and the outer frame 104 can be made of metal or glass, so that the outer frame has good hardness and wear resistance.

Specifically, to ensure that the foldable display device can display a complete picture in any state, when the foldable display device is in an unfolded state, the area of the light emitting surface 2011 is smaller, the light emitted by the projection lens 202 can have a smaller coverage area after reaching the light emitting surface 2011, and at this time, the projection lens 202 can have a smaller distance from the light emitting surface 2011, so that the projection lens 202 can be positioned in the first groove 2012; conversely, when the foldable display device is in the folded state, the area of the light emitting surface 2011 is larger, the light emitted by the projection lens 202 should have a larger coverage area after reaching the light emitting surface 2011, and at this time, the projection lens 202 should have a larger distance from the light emitting surface 2011, so that the projection lens 202 is located in the third groove 1041 formed by the outer frame 104 of the adjacent display screen 10; in this way, when the foldable display device is in the folded state, the step structure of the outer frame 104 of the adjacent display screen 10 forms the third groove 1041 to accommodate the projection lens 202, so that a large enough distance is provided between the projection lens 202 and the light-emitting surface 2011, so that a larger coverage area is ensured after the light emitted by the projection lens 202 reaches the light-emitting surface 2011, and the integrity and fluency of the image displayed by the foldable display device are ensured; meanwhile, when the step structure of the outer frame 104 of the adjacent display screen 10 forms the third groove 1041, the adjacent display screens 10 are arranged back to back, so that the adjacent display screens 10 can lean against each other and support each other, and the display screen has higher strength, does not need to be provided with an additional supporting structure, is beneficial to simplifying the structure of the foldable display device, and is beneficial to the light and thin design of the foldable display device.

On the basis of the above embodiment, optionally, the length of the projection module in the arrangement direction of the two display screens connected with the projection module is a first length L; the first length L is greater than or equal to the total thickness of two adjacent display screens.

For example, as shown in fig. 7, the first length L is set to be greater than or equal to the total thickness of the two adjacent display screens 10, and when the foldable display device is in the folded state, the two adjacent display screens 10 can be oppositely disposed back to back, so that the foldable display device can be in a better folded state, which is beneficial to folding and unfolding of the foldable display device. Wherein, can set up the total thickness that first length L is close two adjacent display screens 10 according to actual conditions, guarantee that two adjacent display screens 10 can form each other and support under the folded condition to avoid display screen 10 to take place deformation under the exogenic action.

Optionally, fig. 8 is a schematic top view of another foldable display device according to an embodiment of the present invention, and as shown in fig. 8, the photographing module 20 includes at least one sensor 203, where the sensor 203 is disposed in the projection screen 201.

In this way, the sensor 203 is arranged in the projection screen 201, so that the number of components in the display screen 10 can be reduced, and the screen occupation ratio of the display screen 10 can be improved; meanwhile, since the light emitted by the projection lens 202 has a certain range, when the projection lens 202 is disposed in the projection screen 201 and includes a plurality of projection lenses 202, or the projection lens 202 includes the projection display elements 2021, the respective projection lenses 202 or the projection display elements 2021 are not densely arranged but are dispersedly arranged, and at this time, the sensor 203 may be disposed in an area of the projection screen 201 where the projection lens 202 is not disposed, so that the entire foldable display device has a higher screen duty ratio.

By way of example, the sensors 203 may include a camera sensor 2031 and a fingerprint recognition sensor 2032. At this time, if the projection lens 202 includes a plurality of projection display elements 2021 sequentially arranged along the second direction Z, the camera sensor 2031 and the fingerprint sensor 2032 may be located at the head and tail of the arrangement of the plurality of projection display elements 2021, respectively. The second direction Z is a direction intersecting the arrangement direction X of the two display screens 10 connected to the projection module 20 to which the projection lens 202 belongs.

It can be understood that the plurality of projection display elements 2021 are sequentially arranged along the second direction Z on the projection module 20, so that the light emitted from the projection display elements 2021 can cover all the light-emitting surfaces of the projection screen 201, avoid the occurrence of phenomena such as black spots, ensure the integrity of the projection screen when the projection screen is folded in any state, and improve the quality of the projection screen emitted from the projection module 20. Accordingly, the camera sensor 2031 may be used to capture images and display them by a foldable display device; the fingerprint recognition sensor 2032 can recognize fingerprint information of a user to perform operations such as screen unlocking, payment, and the like according to the fingerprint information; in this way, by setting the camera sensor 2031 and the fingerprint identification sensor 2032, functions of the foldable display device can be enriched, and user experience can be improved.

It should be noted that, the camera sensor 2031 and the fingerprint recognition sensor 2032 are respectively located at the head and the tail of the arrangement of the plurality of projection display elements 2021, so that the plurality of projection display elements 2021 arranged in sequence may be arranged uniformly at equal intervals, or the distance between two adjacent projection display elements 2021 along the second direction Z from the center gradually increases. On the premise of ensuring the integrity of the displayed picture, the arrangement mode of each projection display element is not particularly limited in the embodiment of the invention.

Optionally, fig. 9 is a schematic top view of still another foldable display device according to an embodiment of the present invention, where, as shown in fig. 9, the sensor 203 includes a plurality of touch sensors 2033; the touch sensor 2033 is used for acquiring position information of a touch object on the light-emitting surface 2011 side of the projection screen 201.

Specifically, the number and the setting positions of the touch sensors 2033 are not particularly limited, and it is preferable to arrange the touch sensors 2033 and the projection display element 2021 at intervals, so as to ensure that the touch position can be identified when a touch object (such as a stylus, a finger, etc.) touches any position of the light emitting surface of the projection screen 201. At this time, a corresponding touch electrode or the like may be disposed in each display screen 10 of the foldable display device, and when a touch object touches the display surface of the display screen 10, the touch electrode in the display screen 10 may identify the position of the touch object, and when the touch object touches the light emitting surface of the projection screen 201, the touch sensor 2033 may identify the position of the touch object. Therefore, all display areas of the foldable display device can be subjected to touch operation, so that the practicability of the foldable display device is further improved, and the user experience can be further improved. The touch sensor 2033 may include an ultrasonic touch chip or an optical touch chip, which is not specifically limited in the embodiment of the invention.

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A foldable display device, comprising: at least two display screens and at least one projection module;

the display pictures presented by the display screens and the projection pictures emitted by the projection screens are spliced into complete pictures;

when the foldable display device is switched from the unfolded state to the folded state, the projection lens moves to one side far away from the projection screen at the first groove; or when the foldable display device is switched from the folded state to the unfolded state, the projection lens moves to the side close to the projection screen at the first groove.

2. The foldable display device of claim 1, further comprising: each display screen comprises a backlight module, a liquid crystal display panel and a cover plate which are sequentially stacked;

a gap is reserved between the liquid crystal display panels of two adjacent display screens; the cover plate is movably connected with the projection module.

3. The foldable display device of claim 1, wherein when the foldable display device is in an unfolded state, two adjacent display screens are in contact, and the display surfaces of the display screens in contact are flush.

4. The foldable display device of claim 2, wherein the light-emitting surface side of the projection screen in each projection module comprises at least two arc-shaped side surfaces arranged opposite to each other; the side edge of the cover plate comprises an arc-shaped groove; and part of the arc-shaped side surface is embedded in the arc-shaped groove.

5. The foldable display device of claim 4, wherein the radius of curvature of the arcuate recess is the same as the radius of curvature of the arcuate side.

6. The foldable display device of claim 4, wherein each of the arcuate sides extends from the light exit face to a side facing away from the light exit face;

the arc-shaped side surface comprises a first arc surface and a second arc surface; when the foldable display device is in an unfolding state, at least part of the first cambered surface is embedded in the cambered groove; when the foldable display device is in a folded state, at least part of the second cambered surface is embedded in the cambered groove.

7. The foldable display device of claim 6, wherein a radius of curvature of the first arcuate surface is the same as a radius of curvature of the second arcuate surface.

8. The foldable display device of claim 6, wherein the first cambered surface and the second cambered surface form a first step structure; the vertical distance from each point on the first cambered surface to the axis of the projection screen is larger than the vertical distance from each point on the second cambered surface to the axis of the projection screen; the axis of the projection screen is parallel to the display surface of the display screen connected with the projection screen.

9. The foldable display device of claim 8, wherein the arcuate side surface further comprises a connecting surface; the connecting surface comprises a first edge and a second edge which are opposite; the first edge is connected with the first cambered surface, and the second edge is connected with the second cambered surface;

when the foldable display device is in a folded state, the side edge of the cover plate is in contact with the connecting surface, and the display surface of the cover plate is flush with the first edge.

10. The foldable display device of claim 4, wherein the light-exiting side of the projection screen further comprises a flat surface for connecting the two oppositely disposed arcuate sides.

11. The foldable display device of claim 10, wherein the display surface of the cover plate is flush with the flat surface of the projection screen when the foldable display device is in the unfolded state.

12. The foldable display device of claim 10, wherein each display screen further comprises an outer frame;

the outer frame is used for supporting the cover plate and accommodating the liquid crystal display panel and the backlight module; a step structure is arranged on one side of the outer frame, which is close to the projection module;

when the foldable display device is in a folded state, the step structures of two adjacent display screens form a third groove, and the third groove is opposite to the first groove;

the projection lens moves along a first direction; when the foldable display device is in an unfolding state, the projection lens is positioned in the first groove; when the foldable display device is in a folded state, the projection lens is positioned in the third groove; the first direction is a direction intersecting with a display surface of the display screen when the foldable display device is in an unfolded state.

13. The foldable display device according to claim 1, wherein a length of the projection module in an arrangement direction of the two display screens connected to the projection module is a first length;

the first length is greater than or equal to the total thickness of two adjacent display screens.

14. The foldable display device of claim 1, further comprising: at least one sensor; the sensor is disposed within the projection screen.

15. The foldable display device of claim 14, wherein the sensor comprises a camera sensor and a fingerprint recognition sensor.

16. The foldable display device of claim 15, wherein the projection lens comprises a plurality of projection display elements arranged in sequence along the second direction; the second direction is a direction intersecting with the arrangement direction of the two display screens connected with the projection module to which the projection lens belongs;

the camera sensor and the fingerprint identification sensor are respectively positioned at the head and tail positions of the projection display elements.

17. The foldable display device of claim 14, wherein the sensor further comprises a plurality of touch sensors;

the touch sensor is used for acquiring position information of a touch object on the light-emitting surface side of the projection screen.