CN115424526A - Flexible display device - Google Patents

Abstract

The utility model relates to a flexible display device, this flexible display device includes flexible display module assembly, flexible display module assembly includes flexible functional layer, flexible functional layer includes along the adjacent first functional area and the second functional area that sets up of smooth roll direction, the orthographic projection of flexible display substrate on flexible functional layer is located first functional area, switching structure locates the one side that flexible functional layer is close to or keeps away from flexible display substrate, the orthographic projection of switching structure on flexible functional layer is located the second functional area. Through applying the effort on the switching structure of being connected with flexible functional layer, through applying the effort on flexible functional layer, make the pulling force of transmitting to flexible display panel's adhesive linkage reduce, the bending and the creep of adhesive linkage reduce, therefore can effectively improve flexible display panel's crease and hunch-up, flexible display module's planarization obviously promotes for the surface is visual respond well, and customer experience is better.

Description

Flexible display device

Technical Field

The disclosure relates to the technical field of display, in particular to a flexible display device.

Background

The sliding and rolling display device can realize that consumers can switch the display area of the flexible panel at will according to the needs of the consumers, provides the use experience better than that of a folding display panel for users, and is an important direction for the development of the flexible display panel.

Flexible module can be at smooth epaxial rolling of spool, and the adhesive linkage in the flexible display panel leads to it to keep certain crooked appearance by the bending creep effect, and then makes the crooked radian that flexible display panel surface appears, seriously influences its appearance, makes customer experience relatively poor.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of this disclosure is to provide a flexible display device, can improve the problem that the crooked radian appears when flexible display module coils on the smooth spool.

According to one aspect of the present disclosure, a flexible display device is provided, which includes a sliding roller and a flexible display module, wherein the sliding roller can rotate around the axis direction of the sliding roller; flexible display module assembly includes flexible display panel and switching structure, flexible display panel includes flexible display substrate and flexible functional layer, flexible display substrate and smooth spool cooperation, the flexible functional layer is located flexible display substrate and is kept away from the one side of smooth spool, the switching structure is located the one side that flexible functional layer is close to or keeps away from flexible display substrate, flexible functional layer includes along the adjacent first functional area and the second functional area that set up of smooth roll direction, the orthographic projection of flexible display substrate on flexible functional layer is located first functional area, the orthographic projection of switching structure on flexible functional layer is located the second functional area.

In one embodiment of the present disclosure, the flexible functional layer includes a flexible cover plate, the flexible cover plate includes a first cover plate portion and a second cover plate portion that are adjacently disposed along a sliding roll direction, the first cover plate portion is located in the first functional area, the second cover plate portion is located in the second functional area, the flexible display substrate is disposed on the first cover plate portion, and the switching structure is disposed on the second cover plate portion.

In one embodiment of the disclosure, the flexible functional layer includes a polarizer and a flexible cover plate which are sequentially away from the sliding scroll, the polarizer includes a first polarized light portion and a second polarized light portion which are adjacently arranged along the sliding scroll direction, the first polarized light portion is located in the first functional area, the second polarized light portion is located in the second functional area, the flexible display substrate is located on the first polarized light portion, and the switching structure is located on the second polarized light portion.

In one embodiment of the present disclosure, the flexible display panel further includes a second buffer layer and a supporting layer, the second buffer layer is disposed on one side of the flexible display substrate close to the sliding reel, and the supporting layer is disposed on one side of the second buffer layer close to the sliding reel.

In one embodiment of the disclosure, one side of the supporting layer close to the sliding reel is provided with a plurality of limiting protrusions uniformly arranged along the sliding reel direction.

In one embodiment of the present disclosure, the adapting structure is disposed on a side close to the flexible display substrate, and a thickness of the adapting structure is greater than a sum of thicknesses of the support layer and the second buffer layer.

In one embodiment of the present disclosure, the adapting structure includes a force-receiving portion, and the force-receiving portion is disposed on a surface of the flexible functional layer close to the flexible display substrate.

In an embodiment of the disclosure, the switching structure comprises a filling part, the filling part is arranged between the flexible functional layer and the stressed part, the filling part comprises at least two filling layers, two adjacent filling layers are arranged at intervals, and every two adjacent filling layers are bonded together through a second bonding layer.

In one embodiment of the present disclosure, the filling layer is a metal layer or an optical film layer.

In one embodiment of the present disclosure, the number of the force-receiving portions is at least two, the at least two force-receiving portions are uniformly arranged along a first direction, and the first direction is a width direction of the flexible display panel.

In one embodiment of the present disclosure, the flexible cover sheet includes at least two sub-cover sheet layers, and two adjacent sub-cover sheet layers are bonded together by a third adhesive layer.

In an embodiment of the present disclosure, the flexible display device further includes a fixed housing, a sliding housing, and a guide shaft, the guide shaft and the sliding shaft are disposed on the sliding housing at an interval along a second direction, the sliding shaft and the guide shaft are parallel to each other, the second direction is perpendicular to the first direction, the switching structure is fixed on the guide shaft, and one end of the flexible display module, which is far away from the switching structure along the sliding direction, is fixed on the fixed housing.

The flexible display device comprises a flexible display module, the flexible display module comprises a flexible functional layer, the flexible functional layer comprises a first functional area and a second functional area which are adjacently arranged along a sliding roll direction, the orthographic projection of the flexible display substrate on the flexible functional layer is located in the first functional area, the switching structure is arranged on one surface, close to or far away from the flexible display substrate, of the flexible functional layer, and the orthographic projection of the switching structure on the flexible functional layer is located in the second functional area. Through applying the effort on the switching structure of being connected with flexible functional layer, through applying the effort on flexible functional layer, make the pulling force of transmitting to flexible display panel's adhesive linkage reduce, the bending and the creep of adhesive linkage reduce, therefore can effectively improve flexible display panel's crease and hunch-up, flexible display module's planarization obviously promotes for the surface is visual respond well, and customer experience is better.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 is a schematic cross-sectional view of a flexible display module according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of an unfolding process of a flexible display panel according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a rolling process of a flexible display panel according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a flexible display device according to an embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of another flexible display module according to an embodiment of the present disclosure.

Fig. 6 is a schematic cross-sectional view of another flexible display module according to an embodiment of the present disclosure.

Fig. 7 is a schematic plan view of a flexible display module according to an embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of a filling portion according to an embodiment of the present disclosure.

Fig. 9 is a schematic structural diagram of a flexible cover plate according to an embodiment of the present disclosure.

Fig. 10 is a schematic structural diagram of a flexible display substrate according to an embodiment of the disclosure.

In the figure: 1-a flexible display panel, 10, a flexible display substrate, 101-a planar portion, 102-a scrolling portion; 11. a substrate, 12, a first buffer layer, 13, a driving circuit layer, 131, an active layer, 1311-a channel region, 1312, a source region, 1313, a drain region, 132, a first gate insulating layer, 133, a first gate electrode, 134, an interlayer insulating layer, 135, a first source electrode, 136, a drain electrode, 137, a protective layer, 138, a second source electrode, 14, a planarization layer group, 141, a first planarization layer, 142, a second planarization layer, 15, a pixel defining layer, 16, a subpixel, 161, a pixel electrode, 162, a light emitting layer, 163, a common electrode, 17, an encapsulation layer, 171, a first inorganic encapsulation layer, 172, an organic encapsulation layer, 173, a second inorganic encapsulation layer, 18-a touch layer; 20. the flexible functional layer, 201, the flexible cover plate, 2011, the sub-cover plate layer, 2012, the third adhesive layer, 202, the polaroid, 2021-first pressure sensitive adhesive layer, 203, the first adhesive layer, 2001, the first functional zone, 2002, the second functional zone, 30, the second buffer layer, 301-the second pressure sensitive adhesive layer, 40, the supporting layer, 401, the spacing arch, 2, the switching structure, 21, the filling part, 211, the filling layer, 212, the second adhesive layer, 22, the stress part, 3, the fixed shell, 4, the sliding shell, 5, the rolling mechanism, 51, the sliding roll axle, 52, the guide axle, 53, the tensioning piece.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.

The display device comprises a whole machine shell and a flexible screen arranged on the whole machine shell, wherein one end of the flexible display panel is used as a fixed end, the fixed end is fixed with the whole machine shell, the other end of the flexible display panel is used as a sliding end, and the sliding end is also fixed with the whole machine shell and used for realizing the translational curling, unfolding and folding of the flexible display panel. The flexible display panel can be partly crooked and launch on the slip spool, wherein pack up the in-process at the slip spool, flexible display panel when just with the slip spool separation, the gluey material among the flexible display panel receives crooked creep effect, leads to it to keep certain crooked appearance, leads to flexible display panel to produce the radian of a bending, provides the pulling force variation in size according to the complete machine, and crooked radian can be different. The flexible module seriously influences the appearance of a product in the bending radian appearing in the curling and unfolding process, so that the performance experience of a client is poor.

In order to support the flexible display panel, the flexible display panel is usually designed to be thicker, but the thicker the thickness of the flexible display panel is, the larger the rebound force after the flexible display panel is wound on the sliding scroll, the larger the warping amount is, the appearance and the appearance of the flexible display device are also affected, and the customer experience is poor. As shown in fig. 1, the flexible display panel 1 generally includes a support layer 40, a second buffer layer 30, a flexible display substrate 10, a polarizer 202, a first adhesive layer 203, and a flexible cover 201 in a direction away from the sliding shaft 51, and a sliding end of the flexible display panel 1 may be connected to the whole housing through an adapter structure 2.

In the sliding rolling process, the main processes are divided into rolling unfolding and rolling folding, and the main processes are shown in fig. 2 and fig. 3. When external tension (motor force) is greater than internal tension of the sliding end complete machine shell, the sliding scroll rotates to drive the flexible display panel to unfold, in the process, the external tension (motor force) is large, the sliding scroll moves along a first direction, the flexible display panel is tightly attached to the sliding scroll, and the arching value of the flexible display panel is small; in the flexible screen folding process, the direction of external tension (motor force) is the same as that of internal tension, when the external tension drives the sliding scroll to be folded, the internal tension of the sliding end whole machine shell can drive the flexible display panel to be rewound around the sliding scroll, arching can occur in the range of 5-10mm at the A point, the arching value is 1-3mm, and the appearance of the flexible display device are influenced.

Based on this, the disclosed embodiments provide a flexible display device. As shown in fig. 4 to 10, the flexible display device includes a sliding roller 51 and a flexible display module, wherein the sliding roller 51 can rotate around the axis direction thereof; the flexible display module comprises a flexible display panel 1 and a switching structure 2, the flexible display panel 1 comprises a flexible display substrate 10 and a flexible functional layer 20, the flexible display substrate 10 is matched with a sliding scroll shaft 51, the flexible functional layer 20 is arranged on one surface, far away from the sliding scroll shaft 51, of the flexible display substrate 10, the flexible functional layer 20 comprises a first functional area 2001 and a second functional area 2002 which are adjacently arranged along the sliding scroll direction, the orthographic projection of the flexible display substrate 10 on the flexible functional layer 20 is located in the first functional area 2001, the switching structure 2 is arranged on one surface, close to or far away from the flexible display substrate 10, of the flexible functional layer 20, and the orthographic projection of the switching structure 2 on the flexible functional layer 20 is located in the second functional area 2002.

The orthographic projection of the flexible display substrate 10 on the flexible functional layer 20 is located in the first functional area 2001, the switching structure 2 is arranged on one surface of the flexible functional layer 20 close to or far away from the flexible display substrate 10, and the orthographic projection of the switching structure 2 on the flexible functional layer 20 is located in the second functional area 2002. By applying a force to the relay structure 2 connected to the flexible functional layer 20, and by applying a force to the flexible functional layer 20, the tensile force transmitted to the adhesive layer of the flexible display panel 1 is reduced, and the bending and creep of the adhesive layer are reduced, so that the crease and arching of the flexible display panel can be effectively improved.

In addition, compare in whole flexible display panel, flexible functional layer 20's thickness is less for flexible display module's bounce-back reduces, and the warpage volume reduces, and flexible display module's planarization obviously promotes, makes the surface visual effect good, makes customer experience better.

It can be understood that, compared to the manner of directly disposing the interposer fabric 2 on the flexible functional layer 20, the area of the flexible display substrate 10 can also be reduced, and power consumption in the display process can also be reduced.

As shown in fig. 4, the flexible display device includes a fixed housing 3, a sliding housing 4, a flexible display module, and a rolling mechanism 5, wherein the fixed housing 3 and the sliding housing 4 provide support for the flexible display panel 1, and the sliding housing 4 can slide relative to the fixed housing 3.

The flexible display panel 1 comprises a planar portion 101 and a slider portion 102, the slider portion 102 interconnecting the planar portion 101. Both the scrolling part 102 and the flat part 101 of the flexible display panel 1 may be used for displaying pictures. The display device further comprises a winding mechanism 5, and the winding mechanism 5 is located in the sliding shell 4. The flat portion 101 is connected to the fixed housing 3, and the winding mechanism 5 is used to wind the spool portion 102 inside the slide housing 4.

The winding mechanism 5 includes a sliding reel 51, a guiding shaft 52 and a tensioning member 53, the sliding reel 51 and the guiding shaft 52 are both connected to the sliding housing 4, the guiding shaft 52 and the sliding reel 51 are arranged at an interval along a second direction and are parallel to each other, and the second direction is the length direction of the flexible display panel 1. The middle of the sliding-rolling part 102 surrounds the outside of the reel and is connected with the sliding reel 51 in a sliding manner, the other end of the sliding-rolling part 102 is connected with one end of a tension member 53, the other end of the tension member 53 is connected with the fixed shell 3, and the middle of the tension member 53 surrounds the outer side wall of the guide shaft 52 and is connected with the guide shaft 52 in a sliding manner.

In other practical embodiments, the rolling mechanism 5 may include a sliding roller 51 and an elastic connection member, the flexible display module part may be rolled on the sliding roller 51, and the adapting structure 2 may be connected to the sliding housing 4 through the elastic member.

As shown in fig. 5 and 6, the flexible display panel 1 includes a support layer 40, a second buffer layer 30, a flexible display substrate 10, a flexible functional layer 20, a first adhesive layer 203 and a flexible cover 201, in the roll portion 102 of the flexible display panel 1, the support layer 40 is disposed close to the roll shaft 51, the second buffer layer 30 is disposed on a surface of the support layer 40 away from the roll shaft 51, the flexible display substrate 10 is disposed on a surface of the second buffer layer 30 away from the roll shaft 51, and the flexible functional layer 20 is disposed on a surface of the flexible display substrate 10 away from the roll shaft 51.

One side of the support layer 40 close to the sliding roller 51 is provided with a plurality of limiting protrusions 401 uniformly arranged along the sliding roller direction. The limiting protrusions 401 can provide supporting force for the flexible display panel 1, especially provide stable supporting force for the sliding roll part 102 matched on the sliding roll shaft 51, can eliminate instant arching of rewinding, avoids the defects that the flexible display panel 1 collapses and folds and the like in long-term use, and prolongs the service life of the display module.

The flexible display module further comprises a switching structure 2, the switching structure 2 is arranged on one surface of the flexible functional layer 20 close to or far away from the flexible display substrate 10, the switching structure 2 is arranged at the other end of the sliding and rolling part 102, and the sliding and rolling part 102 is connected with one end of the tensioning piece 53 through the switching structure 2. The flexible functional layer 20 includes a first functional area 2001 and a second functional area 2002 which are adjacently arranged along the roll-sliding direction, an orthographic projection of the flexible display substrate 10 on the flexible functional layer 20 is located in the first functional area 2001, and an orthographic projection of the relay structure 2 on the flexible functional layer 20 is located in the second functional area 2002.

The flexible functional layer 20 may include a flexible cover 201, a first adhesive layer 203, and a polarizer 202, and the polarizer 202 is connected to the flexible cover 201 through the first adhesive layer 203. It should be noted that the polarizer 202 is disposed on a side of the flexible display substrate 10 away from the sliding roller 51, the first adhesive layer 203 is disposed on a side of the polarizer 202 away from the sliding roller 51, and the flexible cover 201 is disposed on a side of the first adhesive layer 203 away from the sliding roller 51.

As shown in fig. 5, the orthographic projection of the polarizer 202 on the flexible cover 201 is located in the first functional area 2001. The flexible cover 201 includes a first cover portion and a second cover portion adjacently disposed along the sliding and rolling direction, the first cover portion is located in the first functional area 2001, the second cover portion is located in the second functional area 2002, the flexible display substrate 10 is disposed on the first cover portion, and the switching structure 2 is disposed on the second cover portion.

As shown in fig. 6, the structure and arrangement of the flexible cover 201 are the same as those in the figure, and therefore, the detailed description thereof is omitted. The polarizer 202 includes a first polarizer and a second polarizer adjacently disposed along the roll direction, the first polarizer is located in the first functional area 2001, the second polarizer is located in the second functional area 2002, the flexible display substrate 10 is disposed on the first polarizer, and the adapting structure 2 is disposed on the second polarizer.

When the interposer structure 2 is disposed on the polarizer 202, the thickness of the interposer structure 2 may be greater than the sum of the thicknesses of the support layer 40 and the second buffer layer 30. When the interposer structure 2 is disposed on the flexible cover 201, the thickness of the interposer structure 2 may be greater than the sum of the thicknesses of the support layer 40, the second buffer layer 30 and the polarizer 202. The advantage of defining the thickness of the adapting structure 2 here is that the pulling force direction can be adjusted to expand away from the sliding roller 51, thereby further avoiding arching of the flexible display panel 1.

As shown in fig. 7, the adapting structure 2 includes a filling portion 21 and a force-receiving portion 22, where the filling portion 21 is disposed on a surface of the flexible functional layer 20 close to the flexible display substrate 10, and the force-receiving portion 22 is disposed on a surface of the filling portion 21 away from the flexible display substrate 10. The number of the stress parts 22 is two, and the two stress parts 22 are uniformly arranged along the first direction to increase the stress uniformity of the flexible display panel 1. It should be noted that the number of the force-receiving portions includes, but is not limited to, two, and may also be three, four, or more. The first direction is a width direction of the flexible display panel. It will be appreciated that the first and second directions are perpendicular to each other.

As shown in fig. 8, the filling portion 21 includes at least two filling layers 211, two adjacent filling layers 211 are spaced apart from each other, and each two adjacent filling layers 211 are bonded together by a second bonding layer 212. For example, the filling part 21 may include two filling layers 211 and one second adhesive layer 212, the second adhesive layer 212 is adhered between the two filling layers 211, the filling part 21 may also include three filling layers 211 and two second adhesive layers 212, the first second adhesive layer 212 is disposed between the first filling layer 211 and the second filling layer 211, and the second adhesive layer 212 is disposed between the second filling layer 211 and the third filling layer 211.

It should be noted that the filling layer 211 may be a metal layer or an optical film layer. The material of the optical film layer may be Polyimide (PI) or polyethylene terephthalate (PET). The force receiving portion 22 is a film material or a metal strip that is away from the spool 51 in the second direction.

As shown in fig. 9, the flexible cover 201 may include at least two sub-cover layers 2011, and two adjacent sub-cover layers 2011 are bonded together by a third bonding layer 2012. One side of the flexible cover plate 201 far away from the flexible display substrate 10 is generally provided with a hard coating layer and a hydrophobic oil drainage layer with the thickness of 3-10um, so that the flexible cover plate 201 has good scratch resistance and fingerprint resistance.

The sub-cover plate layer 2011 may be made of a transparent polyimide film (CPI), a transparent polyethylene terephthalate (PET), or a transparent Ultra-Thin Glass (UTG). If the flexible cover 201 is made of a transparent polyimide film, the mechanical elastic modulus is about 6GPa, and the transmittance is 90%.

The first adhesive layer 203, the second adhesive layer 212 and the third adhesive layer 2012 are usually optical transparent adhesives, which are typically made of acrylic based materials, and have an elastic modulus of 30-200KPa, an adhesive force of 500-2000gf/inch, and a thickness of 25um-100um.

The polarizer 202 controls the polarization direction of the light beam. The polarizer 202 functions to convert the omnidirectional light into polarized light in a single direction, the polarized light direction is parallel to the transmission axis direction of the polarizer 202, and the light perpendicular to the transmission axis direction is absorbed. The polarizer 202 generally includes a PVA film and a TAC film, wherein the PVA film is responsible for polarization, and is a core film of the polarizer 202, and determines key parameters of the polarizer 202, such as polarization performance, transmittance, and color tone, and the TAC film supports and protects the extended PVA film.

The second buffer layer 30 may be made of foam or Polyurethane (PU) and the like, and the elastic modulus of the foam or the polyurethane is 1-10MPa.

The supporting layer 40 can be a patterned metal piece, the base material of the supporting layer 40 can be a stainless steel plate, a plurality of array arrangement holes are formed in the stainless steel in an etching mode, the holes can be strip-shaped holes, the length direction of the holes is consistent with the axial direction of the reel, the effect of transverse supporting is achieved, and curling cannot be affected.

As shown in fig. 10, the flexible display substrate 10 may be an OLED display substrate. The flexible display substrate 10 may generally include a substrate 11, a driving circuit layer 13, a planarization layer group 14, and a pixel layer 16, the driving circuit layer 13 being disposed on one side of the substrate 11, the planarization layer group 14 being disposed on one side of the driving circuit layer 13 away from the substrate 11, and the pixel layer 16 being disposed on one side of the planarization layer group 14 away from the substrate 11. In addition, the flexible display substrate 10 may further include a first buffer layer 12, and the first buffer layer 12 is disposed between the substrate 11 and the driving circuit layer 13.

The base substrate 11 may be an inorganic base substrate or an organic base substrate. For example, in one embodiment of the present disclosure, the material of the substrate 11 may be a glass material such as soda-lime glass (soda-lime glass), quartz glass, or sapphire glass, or may be a metal material such as stainless steel, aluminum, or nickel.

In another embodiment of the present disclosure, the substrate 11 may also be a flexible substrate, for example, the material of the substrate 11 may be Polyimide (PI). The substrate 11 may also be a composite of multiple layers of materials, for example, in an embodiment of the present disclosure, the substrate 11 may include a Bottom Film layer (Bottom Film), a pressure sensitive adhesive layer, a first polyimide layer, and a second polyimide layer, which are sequentially stacked.

In the present disclosure, the driving circuit layer 13 is provided with a driving circuit for driving the sub-pixels. In the driver circuit layer 13, any one driver circuit may include a transistor and a storage capacitor. Further, the transistor may be a thin film transistor, and the thin film transistor may be selected from a top gate type thin film transistor, a bottom gate type thin film transistor, or a dual gate type thin film transistor; taking the top gate type thin film transistor as an example, the driving circuit layer 13 may include an active layer 131, a gate insulating layer 132, a gate electrode 133, and a first source-drain metal layer, wherein:

the active layer 131 is disposed on one side of the substrate 11 and located in the display region 101. The material of the active layer 131 may be an amorphous silicon semiconductor material, a low temperature polysilicon semiconductor material, a metal oxide semiconductor material, an organic semiconductor material, or other types of semiconductor materials; the thin film transistor may be an N-type thin film transistor or a P-type thin film transistor. The active layer 131 may include a channel region 1311 and two doping regions of different doping types, i.e., a source region 1312 and a drain region 1313, located at both sides of the channel region 1311.

The gate insulating layer 132 may cover the active layer 131 and the substrate 11, and the material of the gate insulating layer 132 is an insulating material such as silicon oxide.

The gate electrode 133 is disposed in the display region 101. The gate electrode 133 is disposed on a side of the gate insulating layer 132 away from the substrate 11, and is opposite to the active layer 131, that is, a projection of the gate electrode 133 on the substrate 11 is located within a projection range of the channel region 1311 of the active layer 131 on the substrate 11, for example, the projection of the gate electrode 133 on the substrate 11 is overlapped with the projection of the channel region 1311 of the active layer 131 on the substrate 11.

The driving circuit layer 13 further includes an interlayer insulating layer 134, the interlayer insulating layer 134 is provided on a side of the gate electrode 133 away from the base substrate 11, and the interlayer insulating layer 134 covers the gate electrode 133 and the gate insulating layer 132. The interlayer insulating layer 134 and the gate insulating layer 132 are provided with via holes corresponding to the source region 1312 and the drain region 1313 of the active layer 131.

The first source-drain metal layer is disposed on the surface of the interlayer dielectric layer 135 away from the substrate 11, the first source-drain metal layer includes a first source 135 and a first drain 136, the first source 135 and the first drain 136 are disposed in the display region 101 and are connected to the active layer 131, for example, the first source 135 and the first drain 136 are respectively connected to the source region 1312 and the drain region 1313 of the corresponding active layer 131 through vias.

A protective layer 137 is arranged on one side of the first source-drain metal layer, which is far away from the substrate base plate 11, and the protective layer 137 covers the first source-drain metal layer. A planarization layer group 14 is arranged on one side of the first source-drain metal layer, which is far away from the substrate base plate 11, the planarization layer group 14 is arranged on one side of the protection layer 137, which is far away from the substrate base plate 11, the planarization layer group 14 covers the protection layer 137, and the surface of the planarization layer group 14, which is far away from the substrate base plate 11, is a plane.

Specifically, the planarization layer group 14 may include a first planarization layer 141, and the first planarization layer 141 covers the protection layer 137. The flexible display substrate 10 may further include a second source-drain metal layer, a second planarization layer 142 is disposed on a side of the second source-drain metal layer away from the substrate 11, and the second planarization layer 142 covers the second source-drain metal layer and a side of the first planarization layer 141 away from the substrate 11. The second source-drain metal layer includes a second source 138, and the second source 138 is connected to the first source 135 through a via.

A pixel defining layer 15 and a pixel layer 16 may be provided on a side of the planarization layer group 14 away from the substrate base plate 11, the pixel defining layer 15 and the pixel layer 16 being located in the display region 101. The pixel defining layer 15 has a plurality of pixel openings, and the pixel layer 16 includes a plurality of sub-pixels respectively disposed in the plurality of pixel openings. The plurality of sub-pixels are distributed in the driving backplate 10 on the side away from the substrate base plate 11, and the specific sub-pixels may be located on the side of the planarization layer group 14 away from the substrate base plate 11. The sub-pixels may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel according to the emission color.

The pixel layer 16 may include a plurality of pixel electrodes 161, a light emitting layer 162, and a common electrode 163, the pixel electrodes 161 are located on the surface of the driving backplane 10 away from the substrate 11, the light emitting layer 162 is located on the surface of the pixel electrodes 161 away from the substrate 11, and the common electrode 163 is located on the surface of the light emitting layer 162 away from the substrate 11.

The pixel electrode 161 is connected to the first source electrode 135 or the second source electrode 138. When the driving circuit layer 13 includes only the first source electrode 135 and the first planarizing layer 141, the pixel electrode 161 is connected to the first source electrode 135 through the via hole on the first planarizing layer 141, and the pixel defining layer 15 is disposed to cover the first electrode 161 and the first planarizing layer 141. When the driving circuit layer 13 further includes the second source-drain metal layer and the second planarizing layer 142, the pixel electrode 161 is connected to the second source electrode 138 through the via hole on the second planarizing layer 142, and the pixel defining layer 15 is disposed to cover the second source-drain metal layer and the second planarizing layer 142.

The common electrode 163 can be used as a cathode, the pixel electrode 161 can be used as an anode, the pixel electrode 161 is connected to a positive electrode of a power supply, the common electrode 163 is connected to a negative electrode of the power supply, and signals can be applied through the pixel electrode 161 and the common electrode 163 to drive the light-emitting layer 162 to emit light so as to display images. The light emitting layer 162 may include an electro-organic light emitting material, and for example, the light emitting layer 162 may include an auxiliary layer and a light emitting material layer sequentially stacked on the pixel electrode 161. Generally, a pattern region is formed on a mask, and an auxiliary layer of sub-pixels with different colors and a light-emitting layer 162 of sub-pixels with different colors are formed by processes such as evaporation.

In addition, the flexible display substrate 10 of the present disclosure may further include an encapsulation layer 17, where the encapsulation layer 17 is disposed on a side of the pixel layer 16 away from the substrate 11, so as to cover the pixel layer 16 and prevent water and oxygen erosion. The encapsulation layer 17 may be a single layer or a multi-layer structure, and the material of the encapsulation layer 17 may include organic or inorganic materials, which is not particularly limited herein.

In this embodiment, the encapsulation layer 17 may include a first inorganic encapsulation layer 171, an organic encapsulation layer 172, and a second inorganic encapsulation layer 173, the first inorganic encapsulation layer 171 is disposed on a side of the pixel layer 16 away from the substrate 11, the organic encapsulation layer 172 is disposed on a side of the first inorganic encapsulation layer 171 away from the substrate 11, and the second inorganic encapsulation layer 173 is disposed on a side of the organic encapsulation layer 172 away from the substrate 11. The side of the encapsulation layer 17 away from the base substrate 11 may also be provided with a touch layer 18.

When the adapter is disposed on the flexible functional layer 20, the normal strain of the flexible cover 201 is 1.6%, the normal strain of the touch layer 18 is 0.17%, and the normal strain of the second inorganic encapsulation layer 173 is 0.16%; when the interposer is disposed on the support layer 40, the normal strain of the flexible cover 201 is 1.1%, the normal strain of the touch layer 18 is 0.23%, and the normal strain of the second inorganic encapsulation layer 173 is 0.22%, it can be understood that, for the normal strains of the touch layer 18 and the second inorganic encapsulation layer 173, disposing the interposer on the flexible functional layer 20 is smaller than disposing the interposer on the support layer 40.

When the adapter is arranged on the flexible functional layer 20, the strain of the first adhesive layer 203 is 130%, the strain of the pressure sensitive adhesive layer of the polarizer 202 is 120%, and the strain of the pressure sensitive adhesive layer of the buffer layer is 160%; when the interposer is placed on the support layer 40, the strain of the first adhesive layer 203 is 140%, the strain of the pressure sensitive adhesive layer of the polarizer 202 is 150%, and the strain of the pressure sensitive adhesive layer of the buffer layer is 175%. For the strain of the first adhesive layer 203, the strain of the pressure sensitive adhesive layer of the polarizer 202, and the strain of the pressure sensitive adhesive layer of the buffer layer, the disposing of the transfer portion on the flexible functional layer 20 is smaller than the disposing of the transfer portion on the support layer 40.

In summary, except for the flexible cover plate 201, for the strain of most functional layers and adhesive layers, the positions of the transition portions on the flexible functional layer 20 are all smaller than the positions of the transition portions on the support layer 40, so that the flexible display device provided by the embodiment of the disclosure reduces the bending radian of the flexible display panel, improves the appearance and the appearance, and enables customers to experience better.

It should be noted that, the display device includes other necessary components and compositions, such as a circuit board, a power line, and the like, besides the fixed housing, the sliding housing, the flexible display module, and the rolling mechanism, and those skilled in the art can perform corresponding supplementation according to the specific use requirement of the flexible display device, and details are not repeated herein.

The flexible display device may be a conventional electronic device, for example: cell phones, computers, televisions, video recorders and video players, as well as emerging wearable devices such as VR glasses, not to mention here.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (12)

1. A flexible display device, comprising:

a spool rotatable about an axis thereof;

flexible display module assembly, including flexible display panel and switching structure, flexible display panel includes flexible display substrate and flexible functional layer, flexible display substrate with smooth spool cooperation, flexible functional layer is located flexible display substrate keeps away from the one side of smooth spool, the switching structure is located flexible functional layer is close to or keeps away from flexible display substrate's one side, flexible functional layer includes along the adjacent first functional area and the second functional area that set up of smooth roll direction, flexible display substrate is in orthographic projection on the flexible functional layer is located first functional area, the switching structure is in orthographic projection on the flexible functional layer is located the second functional area.

2. The flexible display device of claim 1, wherein the flexible functional layer comprises a flexible cover, the flexible cover comprises a first cover and a second cover disposed adjacent to each other along a scrolling direction, the first cover is located in the first functional area, the second cover is located in the second functional area, the flexible display substrate is disposed on the first cover, and the interconnecting structure is disposed on the second cover.

3. The flexible display device according to claim 1, wherein the flexible functional layer comprises a polarizer and a flexible cover plate sequentially away from the sliding roll, the polarizer comprises a first polarizing part and a second polarizing part adjacently arranged along the sliding roll direction, the first polarizing part is located in the first functional area, the second polarizing part is located in the second functional area, the flexible display substrate is disposed on the first polarizing part, and the adapting structure is disposed on the second polarizing part.

4. The flexible display device of claim 1, wherein the flexible display panel further comprises a second buffer layer disposed on a side of the flexible display substrate adjacent to the sliding roller, and a support layer disposed on a side of the second buffer layer adjacent to the sliding roller.

5. The flexible display device according to claim 4, wherein a side of the support layer adjacent to the scrolling axis is provided with a plurality of limiting protrusions uniformly arranged along the scrolling direction.

6. The flexible display device of claim 4, wherein the interposer fabric is disposed on a side close to the flexible display substrate, and a thickness of the interposer fabric is greater than a sum of thicknesses of the support layer and the second buffer layer.

7. The flexible display device of claim 1, wherein the adapting structure comprises a force-receiving portion, and the force-receiving portion is disposed on a surface of the flexible functional layer adjacent to the flexible display substrate.

8. The flexible display device according to claim 7, wherein the interconnecting structure comprises a filling portion, the filling portion is disposed between the flexible functional layer and the force-bearing portion, the filling portion comprises at least two filling layers, two adjacent filling layers are spaced apart from each other, and each two adjacent filling layers are bonded together through a second bonding layer.

9. The flexible display device of claim 8, wherein the filler layer is a metal layer or an optical film layer.

10. The flexible display device according to claim 7, wherein the number of the force-receiving portions is at least two, at least two of the force-receiving portions are uniformly arranged along a first direction, and the first direction is a width direction of the flexible display panel.

11. The flexible display device of claim 1, wherein the flexible cover comprises at least two sub-cover layers, and two adjacent sub-cover layers are bonded together by a third adhesive layer.

12. The flexible display device according to claim 10, further comprising a fixed housing, a sliding housing, and a guide shaft, wherein the guide shaft and the sliding shaft are disposed on the sliding housing at an interval along a second direction, the sliding shaft and the guide shaft are parallel to each other, the second direction is perpendicular to the first direction, the adapting structure is fixed on the guide shaft, and an end of the flexible display module, which is away from the adapting structure along the sliding direction, is fixed on the fixed housing.

Images