CN113093943A

CN113093943A - Display device

Info

Publication number: CN113093943A
Application number: CN202110401502.5A
Authority: CN
Inventors: 高彪; 李钊; 郝潇鸣; 杨喆
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-07-09
Anticipated expiration: 2041-04-14
Also published as: CN113093943B

Abstract

The invention discloses a display device, comprising: the device comprises a machine shell, a first connecting piece and a second connecting piece, wherein the machine shell is provided with an installation cavity with one open end; the sliding assembly is connected with the shell and movably arranged in the mounting cavity between a sliding-out position and a receiving position; the display screen comprises a fixed part and a bendable part which are sequentially connected, the fixed part is connected with the shell, and the bendable part is matched with the sliding component; but response element and control element, but response element locate the flexion, but response element is used for detecting the present length of sliding off of flexion, and response element and control element link to each other, and control element is used for according to the regional illumination area of present length control display that slides off. According to the display device provided by the invention, the sensing element can monitor the current sliding-open length of the bendable part in real time, then the signal is transmitted to the control unit, and the control unit can control the lighting area of the display screen to realize the regional lighting of the display screen, so that the display device is beneficial to reducing the power consumption, and is simple in structure and high in technological sense.

Description

Display device

Technical Field

The present invention relates to the field of electronic devices, and in particular, to a display device.

Background

Display devices (such as mobile phones) have become indispensable in human life and work. Along with the increase of user's demand, display device's size is bigger and bigger, and display device's screen is also bigger and bigger, is not convenient to carry. In the related art, although a pull-out type display device is proposed, the display device has a complicated structure, high power consumption, and a sense of technology is insufficient.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a display device, wherein the sensing element is arranged at the bendable part of the flexible screen, the sensing element can monitor the current sliding-open length of the bendable part in real time, then signals are transmitted to the control unit, and the control unit can control the lighting area of the display screen to realize the lighting of the display screen in different areas, so that the display device is beneficial to reducing power consumption, simple in structure and high in science and technology sense.

A display device according to an embodiment of the present invention includes: the device comprises a machine shell, a first fixing device and a second fixing device, wherein the machine shell is provided with a mounting cavity with one open end; the sliding assembly is connected with the machine shell and movably arranged in the mounting cavity between a sliding-out position and a receiving position; the display screen comprises a fixed part and a bendable part which are sequentially connected, the fixed part is connected with the shell, the bendable part is matched with the sliding assembly, and when the sliding assembly moves to the sliding-out position, the bendable part slides away under the driving of the sliding assembly; when the sliding assembly moves to the retraction position, the bendable part is driven by the sliding assembly to be wound; the display screen comprises a sensing element and a control element, wherein the sensing element is arranged on the bendable part and used for detecting the current sliding length of the bendable part, the sensing element is connected with the control element, and the control element is used for controlling the lighting area of the display screen according to the current sliding length.

According to the display device provided by the embodiment of the invention, the sensing element is arranged at the bendable part of the flexible screen, the sensing element can monitor the current sliding-open length of the bendable part in real time, then the signal is transmitted to the control unit, the control unit can control the display area of the display screen to realize the regional lighting of the display screen, the size of the display area of the display device is accurately controlled, the power consumption is favorably reduced, and meanwhile, the display device is simple in structure, convenient to operate and favorable for improving the user experience.

In some embodiments of the invention, the sliding assembly comprises: the sliding shell is movably connected with the machine shell; the pivot, the pivot with the slip casing rotationally links to each other, the pivot with the cooperation of flexible portion is in order to realize expanding or rolling but flexion.

In some embodiments of the present invention, the sensing element is located at one side in a width direction of the bendable portion.

In some embodiments of the present invention, the sensing element is a plurality of sensing elements, and the plurality of sensing elements are arranged in a length direction of the bendable portion.

In some embodiments of the invention, in the retracted position, each of the plurality of sensing elements is located below the sliding assembly, and one of the plurality of sensing elements that is farthest from the housing is a first sensing element at which the bendable portion is crimped.

In some embodiments of the invention, in the unfolded position, the first sensing element is located above the sliding assembly, the bendable portion is located on the same plane as the fixed portion at the first sensing element, and a portion of the sensing element located on a side of the first sensing element away from the housing is engaged with the sliding assembly.

In some embodiments of the invention, a plurality of the inductive elements are connected in parallel.

In some embodiments of the invention, the inductive element has at least one U-shaped section that is deformable by a force.

In some embodiments of the present invention, the display screen includes a flexible backplane, and the sensing element is disposed on the flexible backplane.

In some embodiments of the present invention, the flexible backplane comprises an organic insulating medium layer and a planarization layer, which are stacked, and the sensing element is disposed between the organic insulating medium layer and the planarization layer.

In some embodiments of the present invention, the display screen includes a touch layer, and the sensing element is disposed on the touch layer.

In some embodiments of the present invention, the touch layer includes a first insulating layer and a second insulating layer stacked on each other, and the sensing element is disposed between the first insulating layer and the second insulating layer.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic perspective view of a display device according to one embodiment of the present invention with a slide assembly in a slide out position;

FIG. 2 is a schematic diagram of the structure of a display panel, a driver IC and a flexible circuit board according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of an arrangement of a plurality of sensing elements according to one embodiment of the present invention;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

FIG. 5 is a schematic side view of a display device according to one embodiment of the invention with the slide assembly in a slide out position;

FIG. 6 is a schematic side view of a display device according to one embodiment of the invention with the slide assembly in a slide out position;

FIG. 7 is a schematic cross-sectional view of a display portion according to an embodiment of the invention, wherein the sensing element is disposed on a flexible backplane;

fig. 8 is a schematic cross-sectional view of a display portion according to another embodiment of the invention, in which a sensing element is disposed on a touch layer;

FIG. 9 is a simulation of strain signals for a plurality of sensing elements in one embodiment in accordance with the invention;

FIG. 10 is a control flow chart of a display module according to an embodiment of the invention.

Reference numerals:

a display device 100;

a housing 10; a mounting cavity 11;

a slide assembly 20; a slide case 21; a rotating shaft 22;

a display screen 30; a fixed portion 31; a bendable portion 32; a display area 33; a border region 34;

a flexible backplane 35; a base substrate 3501; the first gate insulating layer 3502; a second gate insulating layer 3503; an interlayer insulating layer 3504; a first inorganic insulating medium layer 3505; an organic insulating medium layer 3506; a planarization layer 3507; an encapsulation layer 3508; a first gate layer 3509; a first conductive layer 3510; a second gate layer 3511; a second conductive layer 3512; a pixel defining layer 3513; an anode 3514; an active layer 3515;

a touch layer 36; a touch layer substrate 3601; a first insulating layer 3602; a second insulating layer 3603; a conductive bridge 3604; a first touch electrode 3605; a second touch electrode 3606;

an inductive element 40; a U-shaped section 401; a first inductive element 4 a;

a control element 50;

a flexible circuit board 60.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.

A display device 100 according to an embodiment of the present invention is described below with reference to the drawings. For example, the display device 100 may be an electronic device such as a mobile phone or a tablet computer.

Referring to fig. 1 and 2, a display apparatus 100 according to an embodiment of the present invention may include a cabinet 10, a sliding assembly 20, a display screen 30, a sensing element 40, and a control element 50.

Referring to fig. 5 and 6, the housing 10 has a mounting cavity 11 with an open end, the sliding assembly 20 is connected to the housing 10, and the sliding assembly 20 is movably disposed in the mounting cavity 11 between a sliding-out position (as shown in fig. 5) and a receiving position (as shown in fig. 6), wherein one end of the housing 10 may be a left end, a right end, a front end or a rear end of the housing 10, for example, as shown in fig. 5, the left end of the housing 10 has an open opening, the sliding assembly 20 is mounted to the mounting cavity 11 through the open opening, and the sliding assembly 20 and the housing 10 may be slidably engaged by way of a sliding rail.

Referring to fig. 1, the display 30 includes a fixing portion 31 and a bendable portion 32 connected in sequence, the fixing portion 31 is connected to the housing 10, wherein the fixing portion 31 and the housing 10 can be fixedly connected by adhesion, and the bendable portion 32 is engaged with the sliding assembly 20. For example, the entire display screen 30 may be a flexible screen, or only the bendable portion 32 may be a flexible screen.

Referring to fig. 1 and 5, when the sliding assembly 20 moves to the sliding-out position, the bendable portion 32 slides out under the driving of the sliding assembly 20, and it can be understood that the sliding-out length of the display 30 is the largest in the sliding-out position; referring to fig. 6, when the sliding assembly 20 moves to the retracted position, the bendable portion 32 is rolled up by the sliding assembly 20, and it can be understood that, in the retracted position, the slide-out length of the display 30 is minimum, the sensing element 40 is disposed on the bendable portion 32, and the sensing element 40 is used for detecting the current slide-out length of the bendable portion 32.

Referring to fig. 2, the sensing element 40 is connected to a control element 50, and the control element 50 is used to control the illuminated area of the display screen 30 according to the current slide-off length. Here, the current slide-out length of the bendable portion 32 may be understood as a length of a portion of the current bendable portion 32 that is at the same level as the fixed portion 31 (as shown in fig. 5). For example, the control element 50 may be an Integrated Circuit (IC), and the display device 100 further includes a flexible Circuit board 60, and the display screen 30 is connected to a main board of the display device 100 through the flexible Circuit board 60.

It can be understood that, as shown in fig. 5 and 6, when the sliding assembly 20 moves from the retracted position to the slid-out position, the bendable part 32 is driven by the sliding assembly 20 to slide away, the sliding-out length of the bendable part 32 is increased, so that the display area of the display screen 30 is gradually increased, the sensing element 40 monitors the current sliding-out length of the bendable part 32 in real time, and then transmits a signal to the control unit, and the control unit controls the display screen 30 to be gradually lighted according to the current sliding-out length of the bendable part 32;

referring to fig. 5 and 6, when the sliding assembly 20 moves from the sliding-out position to the receiving position, the bendable portion 32 is rolled under the driving of the sliding assembly 20, the sliding-out length of the bendable portion 32 is gradually reduced, so that the display area where the display screen 30 is unfolded becomes smaller, the sensing element 40 monitors the current sliding-out length of the bendable portion 32 in real time, and then transmits a signal to the control unit, the control unit controls the display screen 30 to gradually extinguish according to the receiving portion of the bendable portion 32, therefore, the size of the display area of the display device 100 can be accurately controlled, which is beneficial to reducing power consumption, and the structure is simple and high in technological sense.

In view of this, according to the display device 100 of the embodiment of the present invention, the sensing element 40 is disposed on the bendable portion 32 of the flexible screen, the sensing element 40 can monitor the current sliding length of the bendable portion 32 in real time, and then transmit a signal to the control unit, and the control unit can control the display area of the display screen 30 to implement the lighting of the display screen 30 in different areas, so as to accurately control the size of the display area of the display device 100, which is beneficial to reducing power consumption, and meanwhile, the display device 100 has a simple structure, is convenient to operate, and is beneficial to improving user experience.

In some embodiments of the present invention, and as illustrated with reference to FIG. 1, slide assembly 20 comprises: a sliding housing 21 and a rotating shaft 22, the sliding housing 21 is movably connected with the casing 10, the rotating shaft 22 is rotatably connected with the sliding housing 21, and the rotating shaft 22 is matched with the bendable part 32 to realize the unfolding or rolling of the bendable part 32. It is understood that during the movement of the sliding assembly 20 between the sliding position and the retracted position, the flexible portion 32 can be extended or retracted by the rotation shaft 22 cooperating with the flexible portion 32, so that the flexible portion 32 can be reliably extended or retracted, which is beneficial to ensure the reliability of the operation of the sliding assembly 20. Optionally, a plurality of first teeth are disposed on the outer peripheral wall of the rotating shaft 22, the first teeth are spaced apart from each other on the outer peripheral wall of the rotating shaft 22, a plurality of second teeth adapted to cooperate with the first teeth are disposed on the side wall of the bendable portion 32 facing the rotating shaft 22, and the second teeth extend in the length direction of the bendable portion 32.

For example, in some examples, referring to fig. 5, when the sliding assembly 20 is in the sliding-out position, the portion of the bendable portion 32 is located above the winding shaft and in the same plane as the fixed portion 31, the free end of the bendable portion 32 is located outside the casing 10, and the sliding-out length of the bendable portion 32 is the largest; referring to fig. 6, when the sliding assembly 20 is in the retracted position, a portion of the bendable portion 32 is retracted into the housing 10 and is disposed parallel to the fixed portion 31, and the sliding length of the bendable portion 32 is zero. It can be understood that the bendable portion 32 can be extended or retracted around the rotation shaft 22, which is beneficial to reduce damage to the bendable portion 32 and prolong the service life of the display screen 30.

In some embodiments of the present invention, as shown with reference to fig. 2, the sensing element 40 is located at one side in the width direction of the bendable part 32. It can be understood that, by disposing the sensing element 40 at one side in the width direction of the bendable portion 32, it is beneficial to make the sensing element 40 avoid the display area of the bendable portion 32, and ensure the display area of the display screen 30. For example, referring to fig. 1, the bendable portion 32 has a display area 33 and a frame area 34, the frame area 34 is located on one side of the display area 33 in the width direction of the bendable portion 32 (refer to fig. 7), and the sensing element 40 is provided in the frame area 34. Of course, the present invention is not limited to this, and the sensing element 40 may also be provided on the other side in the width direction of the bendable portion 32, or the sensing element 40 may be provided on both sides in the width direction of the bendable portion 32.

In some embodiments of the present invention, referring to fig. 3 and 4, the sensing element 40 is plural, and the plural sensing elements 40 are arranged in the length direction of the bendable portion 32. For example, referring to fig. 2, a plurality of sensing elements 40 are arranged at intervals in the left-right direction, and each sensing element 40 is a strain gauge sensor. This is advantageous in improving the accuracy of detecting the current slide-out length of the bendable portion 32 and ensuring the reliability of lighting the display screen 30 in different areas. It should be noted that the number and the overall length of the sensing elements 40 can be adjusted according to the rolling distance of the bendable portion 32 and the rolling radius, and the invention is not limited thereto.

In some embodiments of the present invention, referring to fig. 6, in the retracted position, the plurality of sensing elements 40 are each located below the sliding assembly 20, one of the plurality of sensing elements 40 farthest from the housing 10 is the first sensing element 4a, and the bendable portion 32 enters the curl at the first sensing element 4 a. For example, referring to fig. 6, in the retracted position, the bendable portion 32 is engaged with the rotary shaft 22 at the first sensing element 4a to enter the curl, and the portion of the bendable portion 32 where the remaining sensing elements 40 are located does not enter the curl. Therefore, whether the display device 100 is in the receiving position can be accurately judged, and the working reliability of the display device 100 can be favorably ensured.

In some alternative embodiments of the present invention, referring to fig. 5, in the extended position, the first sensing element 4a is located above the sliding assembly 20, the bendable portion 32 is located on the same plane as the fixed portion 31 at the first sensing element 4a, and a portion of the sensing element 40 located on a side of the first sensing element 4a away from the housing 10 is engaged with the sliding assembly 20. It can be understood that when the sliding assembly 20 is gradually moved from the retracted position to the slid-out position, the plurality of sensing elements 40 can gradually participate in the rolling, the sensing elements 40 at different positions gradually generate electric signals, the current sliding-out length of the bendable portion 32 can be known through algorithm analysis, and then the signals can be input into the control element 50 to control the display of the unfolding portion of the display screen 30, so that the operation is convenient and the working reliability is high. For example, in the deployed position, the portion of the inductive element 40 to the left of the first inductive element 4a engages the shaft 22 and participates in the crimping.

In some embodiments of the present invention, as illustrated with reference to fig. 3 and 4, a plurality of inductive elements 40 are connected in parallel. Therefore, the work of each sensing element 40 can be independent, which is beneficial to ensuring the reliability of the work of each sensing element 40. For example, the sensing element 40 is a chain type of resistance strain gauge sensor, each of which is independent of the other, a plurality of resistance strain gauge sensors may share one output line, and an input power source of each resistance strain gauge sensor may be separately provided.

In some embodiments of the present invention, and as illustrated with reference to FIG. 4, the inductive element 40 has at least one U-shaped section 401, the U-shaped section 401 being capable of being deformed by a force. This ensures the reliability of detection of the curl deformation of the bendable portion 32 by the sensor element 40, and the sensor element 40 has a simple structure and low cost. For example, fig. 9 is a simulation diagram of strain signals of the plurality of sensing elements 40 participating in the curling process, which specifically reflects the corresponding relationship between the strains of the different sensing elements 40 arranged in the length direction of the bendable portion 32 and time, and can accurately determine the current slide-out length of the bendable portion 32 by integrating the strains of the plurality of sensing elements 40.

In some embodiments of the present invention, as shown in FIG. 7, the display screen 30 includes a flexible backplane 35, and the sensing element 40 is disposed on the flexible backplane 35. For example, referring to fig. 6, when the display screen 30 does not have an integrated touch layer, the sensing element 40 may be disposed in the flexible backplane 35 structure of the display screen 30, thereby facilitating the disposition of the sensing element 40 and improving the production efficiency.

In some alternative embodiments of the present invention, as shown in fig. 7, flexible backplane 35 comprises a layer of organic insulating medium 3506 and a layer of planarization 3507 arranged in a stack, and sensing element 40 is disposed between layer of organic insulating medium 3506 and layer of planarization 3507. Thereby further facilitating the arrangement of the inductive element 40 and ensuring the reliability of the operation of the inductive element 40. For example, the flexible backplane 35 includes a substrate 3501 (where the substrate 3501 may be made of a polyimide material), a first gate insulating layer 3502, a second gate insulating layer 3503, an interlayer insulating layer 3504, a first inorganic insulating medium layer 3505, an organic insulating medium layer 3506, a planarization layer 3507, an encapsulation layer 3508, a first gate layer 3509, a first gate layer 3510, a second gate layer 3511, a second conductive layer 3512, a pixel definition layer 3513, an anode 3514, and an active layer 3515. specifically, the sensing element 40 may be routed between the organic insulating medium layer 3506 and the planarization layer 3507 by a metal routing process, and a routing form required by design is obtained by etching, and meanwhile, the plurality of sensing elements 40 are located in the frame region 34, thereby further facilitating the arrangement of the sensing element 40.

In some embodiments of the present invention, referring to fig. 8, the display screen 30 includes a touch layer 36, and the sensing element 40 is disposed on the touch layer 36. For example, the sensing element 40 can be disposed on the same layer of the touch metal traces by using a metal trace process in the touch layer 36, and a desired trace pattern can be obtained by etching. Therefore, the display screen 30 has a touch function, and the arrangement of the sensing element 40 is facilitated.

In some alternative embodiments of the present invention, referring to fig. 8, the touch layer 36 includes a first insulating layer 3602 and a second insulating layer 3603 which are stacked, and the sensing element 40 is disposed between the first insulating layer 3602 and the second insulating layer 3603. Thereby further facilitating the arrangement of the inductive element 40 and ensuring the reliability of the operation of the inductive element 40. For example, the display panel 30 includes a substrate 3501, a first gate insulating layer 3502, a second gate insulating layer 3503, an interlayer insulating layer 3504, a first inorganic insulating medium layer 3505, an organic insulating medium layer 3506, a planarization layer 3507, an encapsulation layer 3508, a first gate layer 3509, a first conductive layer 3510, a second gate layer 3511, a second conductive layer 3512, a pixel defining layer 3513, an anode 3514, an active layer 3515, a touch layer substrate 3601, a first insulating layer 3602, a second insulating layer 3603, a conductive bridge 3604, a first touch electrode 3605, and a second touch electrode 3606, wherein the sensing element 40 is disposed between the first insulating layer 3602 and the second insulating layer 3603, and at the same time, a plurality of sensing elements 40 are disposed in the frame region 34, thereby further facilitating the disposition of the sensing element 40.

Referring to fig. 10, a specific process of detecting the slide-out length of the display device 100 to illuminate the corresponding slide-out area is as follows: firstly, the sliding assembly 20 is moved, then the sensing element 40 participating in the curling position deforms to generate an electric signal, then the sensing element 40 transmits the electric signal to the control element 50, the control element 50 sends a display area instruction according to the size of the electric signal, and finally the display device 100 lights a corresponding sliding area, so that the size of the display area of the display device 100 can be accurately controlled, and the power consumption is favorably reduced.

Other configurations and operations of the display device 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A display device, comprising:

the device comprises a machine shell, a first fixing device and a second fixing device, wherein the machine shell is provided with a mounting cavity with one open end;

the sliding assembly is connected with the machine shell and movably arranged in the mounting cavity between a sliding-out position and a receiving position;

the display screen comprises a fixed part and a bendable part which are sequentially connected, the fixed part is connected with the shell, the bendable part is matched with the sliding assembly, and when the sliding assembly moves to the sliding-out position, the bendable part slides away under the driving of the sliding assembly; when the sliding assembly moves to the retraction position, the bendable part is driven by the sliding assembly to be wound;

the display screen comprises a sensing element and a control element, wherein the sensing element is arranged on the bendable part and used for detecting the current sliding length of the bendable part, the sensing element is connected with the control element, and the control element is used for controlling the lighting area of the display screen according to the current sliding length.

2. The display device according to claim 1, wherein the sliding assembly comprises:

the sliding shell is movably connected with the machine shell;

the pivot, the pivot with the slip casing rotationally links to each other, the pivot with the cooperation of flexible portion is in order to realize expanding or rolling but flexion.

3. The display device according to claim 1, wherein the sensing element is located on one side in a width direction of the bendable portion.

4. The display device according to claim 1, wherein the sensing element is plural, and the plural sensing elements are arranged in a length direction of the bendable portion.

5. The display device according to claim 4, wherein in the retracted position, the plurality of sensing elements are each located below the slide assembly, and one of the plurality of sensing elements that is farthest from the housing is a first sensing element at which the bendable portion is curled and deformed.

6. The display device according to claim 5, wherein in the unfolded position, the first sensing element is located above the sliding assembly, the bendable portion is located on the same plane as the fixed portion at the first sensing element, and a portion of the sensing element located on a side of the first sensing element away from the housing is engaged with the sliding assembly.

7. The display device according to claim 4, wherein a plurality of the inductive elements are connected in parallel.

8. The display device as claimed in claim 1, wherein the sensing element has at least one U-shaped section, the U-shaped section being deformable by force.

9. A display device as claimed in any one of claims 1 to 8, wherein the display screen comprises a flexible backplane, the sensing element being provided on the flexible backplane.

10. The display device according to claim 9, wherein the flexible backplane comprises an organic insulating medium layer and a planarization layer arranged in a stacked manner, and the sensing element is arranged between the organic insulating medium layer and the planarization layer.

11. The display device according to any one of claims 1 to 8, wherein the display screen comprises a touch layer, and the sensing element is disposed on the touch layer.

12. The display device according to claim 11, wherein the touch layer comprises a first insulating layer and a second insulating layer stacked on each other, and the sensing element is provided between the first insulating layer and the second insulating layer.