Patent Publication Number: US-2019182969-A1

Title: Flexible display and it fabricating method and display device

Description:
RELATED APPLICATIONS 
     This application is a continuation application of PCT Patent Application No. PCT/CN2018/071302, filed Jan. 4, 2018, which claims the priority benefit of Chinese Patent Application No. 201711331845.9, filed Dec. 23, 2017, which is herein incorporated by reference in its entirety. 
    
    
     FIELD OF THE DISCLOSURE 
     The present disclosure relates to a display and its fabricating method, and more particularly, to a flexible display and its fabricating method, and a display device with a flexible display. 
     BACKGROUND 
     With the ever-changing technology, the application of display in people&#39;s lives is also more and more widely used. The display usually includes a backplane, a middle frame, a display component and a cover plate. In the conventional hard-type display, the display component is usually attached to the cover plate. However, when the structure is applied to most of the currently available foldable displays, the display is folded, a partial area of the display assembly may be over-stressed due to a neutral surface offset of the display, thereby being damaged or even invalidated. In order to avoid the above problem, in the prior art, the display component is usually pasted on the backplane such that a gap is formed between the display component and the cover, so that the stress between the display component and the cover do not pass each other. However, the above structure also reduces the light output efficiency of the display, thereby affecting the optical quality of the display. 
     SUMMARY 
     In view of this, the present disclosure provides a flexible display in order to effectively solve the above technical problems. 
     In addition, it is also necessary to provide a fabricating method of the flexible display and a display device with the flexible display. 
     A flexible display is divided into at least two non-bent regions and a bent region connecting two adjacent non-bent regions, the flexible display comprising a backplate, a display panel and a cover plate sequentially laminated in order, the peripheral area of the backplate and the peripheral area of the cover plate are connected through a sealant and form a sealed receiving cavity between the backplate and the cover plate, the display panel is set on the back plate and received in the receiving cavity, and an optically clear oil is provided between an area of the display panel corresponding to the bending region and the cover plate. 
     Further, an optically clear oil is disposed between the area of the display panel corresponding to the bending region and the sealant, and the fluidity of the optically clear oil facilitates heat dissipation of the flexible display so as to prevent the flexible display locally overheated. 
     Further, an optically clear oil is disposed between a region corresponding to the non-bending region of the display panel and the cover plate and between a region corresponding to the non-bending region of the display panel and the sealant. 
     Further, an optically clear oil is disposed between a region of the display panel corresponding to the bending region and the backplane. 
     A fabricating method of the flexible display, the flexible display is divided into at least two non-bending regions and bending regions connecting two adjacent non-bending regions, and the method for fabricating the flexible display device includes the following steps: providing a backplate attached with a display panel, the display panel comprising a non-folding region corresponding to the non-bending region and a folding region corresponding to the bending region; dispensing glue along the peripheral region of the backplate to form an uncured or semi-cured sealant, so as to make the sealant and the backplate to round setting and form a receiving slot; to receive the display panel, and the height of the sealant is greater than the height of the display panel; filling at least optically clear oil in an area of the receiving slot corresponding to the folding region, so that the optically clear oil at least covers the folding region; and covering a side of the sealant away from the back plate with a cover plate and curing the sealant, so as to seal the receiving slot to form a receiving cavity, for obtained the flexible display. 
     Further, the step of “filling at least optically clear oil in an area of the receiving slot corresponding to the folding region, so that the optically clear oil at least covers the folding region” is specifically filling optically clear oil so as to cover the entire display panel. 
     Further, the step of “filling at least optically clear oil in an area of the receiving slot corresponding to the folding region, so that the optically clear oil at least covers the folding region” is specifically coating an optically clear oil on at least a portion of the receiving slot corresponding to the unfolded area, so that the optically transparent adhesive covers the corresponding unfolded area; filling an optically clear oil in an area of the receiving slot corresponding to the folding region and the area of the receiving slot corresponding to the non-folding region wherein the optically clear oil is not coated, so that the optically clear oil covers the folding region and the non-folding region which are not covered by the optically clear oil. 
     A fabricating method of a flexible display, the flexible display is divided into at least two non-bending regions and a bending region of connecting two adjacent non-bending regions, and the fabricating method of the flexible display comprises the following steps: providing a backplate, and dispensing glue along the peripheral region of the back plate to form an uncured or semi-cured sealant, so as to make the sealant and the back plate to round setting and form a receiving slot; filling the receiving slot with the optically clear oil, and placing a display panel with a height less than the depth of the receiving slot, so that the display panel is covered with the transparent optical oil; and covering a cover plate on a side of the sealant away from the backplate and curing the sealant so as to seal the receiving slot to form a receiving cavity, for obtaining the flexible display. 
     A display device, comprising a flexible display as described above. 
     In the flexible display according to the present disclosure, an optically clear oil is provided at least between a region of the display panel corresponding to the bending region and the cover plate. So when the flexible display is bent, the stress between the display panel and the cover plate does not transmit to each other, and the display panel, the cover plate and the optically clear oil respectively have a neutral plane, so that the position of the neutral plane of the display panel does not change after the flexible display is formed, to avoid damage caused by the change of the neutral plane position of the display panel when the flexible display is folded. Furthermore, an optically clear oil is provided at least between a region of the display panel corresponding to the bending region and the cover plate. and the total reflectivity of light at each interface is also reduced, thereby promote the light output of the display panel effectiveness. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description are merely some embodiments of the present disclosure. For those skilled in the art, other drawings may be obtained based on these drawings under the premise of without any creative work. 
         FIG. 1  is a schematic structural diagram of a flexible display according to an embodiment of the present disclosure. 
         FIG. 2  is a schematic cross-sectional view of a flexible display according to an embodiment of the present disclosure. 
         FIG. 3  is a schematic cross-sectional view of a flexible display according to another embodiment of the present disclosure. 
         FIG. 4  is a flowchart of a fabricating method of a flexible display according to an embodiment of the present disclosure. 
         FIG. 5  is a schematic cross-sectional view of a back plate bonded with a display panel used in the fabricating method of the flexible display shown in  FIG. 4 . 
         FIG. 6  is a schematic cross-sectional view of forming the sealant and the receiving slot on the back plate shown in  FIG. 5 . 
         FIG. 7  is a schematic cross-sectional view of filling optically clear oil in the receiving slot that shown in  FIG. 6 . 
         FIG. 8  is a flowchart of a fabricating method of the flexible display of another embodiment of the present disclosure. 
         FIG. 9  is a schematic cross-sectional view of the back plate with the sealant and the receiving slot used in the fabricating method of the flexible display shown in  FIG. 8 . 
         FIG. 10  is a cross-sectional schematic diagram of filling optically clear oil in the receiving slot that shown in  FIG. 9 . 
         FIG. 11  is a display device with a flexible display of an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The technical solutions in the embodiments of the present disclosure will be described clearly and completely hereinafter with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part but not all embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure. 
     Underneath will combine  FIG. 1 to 11  and the embodiments to further describe in detail of the flexible display  100  provided by the technical solution and the fabricating method, and the display device  200  provided with the flexible display  100 . 
     Referring to  FIG. 1 to 3 , a flexible display  100  according to a preferred embodiment of the present disclosure, including stacked sequentially a back plate  10 , a display panel  20  and a cover plate  30 . The peripheral region of the back plate  10  and the peripheral region of the cover plate  30  are connected by the sealant  40  and a sealed receiving cavity  50  is formed between the back plate  10  and the cover plate  30 . The display panel  20  is received in the receiving cavity  50 . 
     In the present embodiment, the sealant  40  may be a UV-curable adhesive or a thermosetting adhesive. 
     The flexible display  100  is divided into at least two non-bending regions  101  and a bending region  103  connecting two adjacent non-bending regions  101 . 
     An optically clear oil  60  is accommodated between a region of the display panel  20  corresponding to the bending region  103  and the cover plate  30 . An optically clear oil (not shown) and/or an optically clear adhesive (not shown) may also be disposed between a region of the display panel  20  corresponding to the non-bending region  101  and the cover plate  30 . 
     In the present embodiment, an optically clear oil  60  is accommodated between a region of the display panel  20  corresponding to the bending region  103  and the sealant  40 . 
     In the present embodiment, the display panel  20  is attached to the back plate  10 . In other embodiments, referring to  FIG. 3 , the display panel  20  is disposed at a distance from the back plate  10 , the optically clear oil is accommodated between a region of the display panel  20  corresponding to the bending region  103 . Similarly, optically clear oil may also be accommodated between the region of the display panel  20  corresponding to the non-bending region  103  and the back  10 . The fluidity of the optically clear oil  60  facilitates the conduction and dissipation of heat of the flexible display  100  so as to prevent the flexible display  100  from being partially overheated. 
     In this embodiment, the display panel  20  includes a substrate  21 , a display panel  22 , a touch panel  23  and a polarizer  24  stacked in this order along the stacking direction of the back plate  10  and the cover plate  30 . The display panel  22  may be a liquid crystal display panel, an OLED display panel, or the like. 
     Referring to  FIG. 1 to 2  and  FIG. 4 to 7 , a preferred embodiment of the present disclosure further provides a fabricating method of a flexible display  100   a , which is divided into at least two non-bending regions  101  and adjoining two bending regions  103  of the non-bending region  101 , and the fabricating method of the flexible display  100   a  includes the following steps: 
     In step S 11 , referring to  FIG. 5 , a back plate  10  bonding with a display panel  20  is provided. 
     The display panel  20  is divided into a non-folding region (not shown) corresponding to the non-bending region  101  and a folding region (not shown) corresponding to the bending region  103 . 
     In the embodiment, the display panel  20  includes a substrate  21 , a display panel  22 , a touch panel  23  and a polarizer  24  that are sequentially stacked. The substrate  21  is bonded to the backplane  10 . The display panel  22  is formed on a side of the substrate  21  depart from the backplane  10 . 
     Step S 12 , referring to  FIG. 6 , dispensing along a peripheral region of the back plate  10  to form an uncured or semi-cured sealant  40 , so that the sealant  40  and the back plate  10  surround setting and form the receiving slot  70  to receive the display panel  20 . The height of the sealant  40  is greater than the height of the display panel  20 . 
     In the present embodiment, the sealant  40  may be a UV-curable adhesive or a thermosetting adhesive. 
     In step S 13 , referring to  FIG. 7 , at least an area of the receiving slot  70  corresponding to the folding region is filled with optically clear oil  60 , so that at least the optically clear oil  60  covers the folding region. 
     Specifically, an optically clear adhesive may be coated on at least a part of the receiving slot  70  corresponding to the non-folded area so that the optical clear adhesive covers the corresponding non-folded region. Correspondingly, the receiving slot  70  corresponds to the region of the folding region and the region of the accommodating slot  70  corresponding to the non-folding region where the optically clear adhesive is not coated are filled with the optically clear oil  60  so that the optically clear oil  60  covers the folding region and the area optically clear plastic covered non-folded region. Or the accommodating slot  70  may be filled with optically clear oil  60  to cover the entire display panel  20 . 
     In the present embodiment, the accommodating slot  70  is filled with optically clear oil  60  to cover the entire display panel  20 . 
     Step S 14 , referring to  FIG. 2 , covering a side of the sealant  40  away from the backplane  10  with a cover  30  and curing the sealant  40  to seal the receiving slot  70  to form a receiving cavity  50 , Thereby manufacturing the flexible display  100   a.    
     Specifically, in the evacuated state, the back plate  10  is sealed to the receiving slot  70  to form a sealed receiving cavity  50  so as to prevent air bubbles from being generated between the cover plate  30  and the optically clear oil  60 , and the negative pressure is produced in the receiving chamber  50 , so that the connection between the back plate  10 , the cover plate  30  and the sealant  40  is more compact, thereby preventing the optically clear oil  60  from leaking out. 
     See  FIG. 1, 3   8  to  10 , another preferred embodiment of the present disclosure further provides a fabricating method of a flexible display  100   b , which is divided into at least two non-bending regions  101  and a connection bending region  103  of two adjacent non-bending regions  101 , the fabricating method of the flexible display  100   b  comprises the following steps: 
     Step  31 , referring to  FIG. 9 , provides a back plate  10  and dispensing along the peripheral region of the back plate  10  to form an uncured or semi-cured sealant  40 , so that the sealant  40  and the back plate  10  surround setting to form a receiving slot  70 . 
     Step  32 , referring to  FIG. 10 , filling the receiving slot  70  with the transparent optical oil  60 , and placing the height of the display panel  20  is less than the depth of the receiving slot  70  so that the optically clear oil  60  covered the whole display panel  20 . 
     Specifically, the receiving slot  70  can be directly filled with the transparent optically oil  60  enough to submerge the follow-up placed display panel  20 . Or a part of the transparent optically oil may be filled in the receiving slot  70  to separate the follow-up placing display  20  and the back plate  10  through the transparent optically oil and after put in the display  20  then in the vacuum state continuously filled the optically clear oil so that the optically clear  60  in the receiving slot  70  covers the entire display panel  20 . 
     Step S 33 , referring to  FIG. 3 , covering a side of the sealant  40  away from the backplane  10  with a cover plate  30  and curing the sealant  40  to seal the receiving slot  70  to form a receiving cavity  50 , thereby fabricating the flexible display  100   a.    
     Please refer to  FIG. 11 , which is a schematic diagram of the display device  200 . The display device  200  includes the above flexible display  100  ( 100   a ,  100   b ). Wherein the display device  200  may be a cell phone, a tablet, a television, or the like. 
     In the flexible display  100  ( 100   a ,  100   b ) of the present disclosure, an optically clear oil  60  is disposed between a region of the display panel  20  corresponding to the bending region  103  and the cover plate  30 , such that the flexible display  100  ( 100   a ,  100   b ), the display panel  20  and the cover plate  30  do not transmit the stress to each other during bending, and the display panel  20 , the cover plate  30  and the optically clear oil  60  respectively have a neutral surface (Neutral Plane) such that the position of the neutral plane of the display panel  20  does not change after the flexible display  100  ( 100   a ,  100   b ) is formed, to avoid damage caused by the change of the neutral plane position of the display panel  20  when the flexible display  100  ( 100   a ,  100   b ) is folded. In addition, an optically clear oil  60  is disposed between a region of the display panel  20  corresponding to the bending region  103  and the cover plate  30 , and the total reflectivity of light at each interface is also reduced, so as to improve the display panel  20  of the light output efficiency. Likewise, the formation of the optically clear oil  60  between the backplate  10  and the display panel  20  can further protect the display panel  20  when the flexible display  100  ( 100   a ,  100   b ) is folded so as to prevent the flexible display  100  ( 100   a ,  100   b ) from failing and facilitates the conduction of heat of the flexible display  100  ( 100   a ,  100   b ) to avoid local overheating of the flexible display  100  ( 100   a ,  100   b ). 
     The above disclosure is only the preferred embodiments of the present disclosure, and certainly cannot be used to limit the scope of the present disclosure. Those skilled in the art may understand that all or part of the processes of the above embodiments may be implemented and that the claims of the present disclosure equivalent changes are still within the scope of the disclosure.