Patent Publication Number: US-2019172376-A1

Title: Foldable display panel and preparation method thereof

Description:
RELATED APPLICATIONS 
     The present application is a National Phase of International Application Number PCT/CN2018/070040, filed Jan. 2, 2018, and claims the priority of China Application No. 201711270910.1, filed Dec. 5, 2017. 
    
    
     FIELD OF THE DISCLOSURE 
     The present invention relates to the field of display technology, and in particular, to a preparation method of a foldable display panel. 
     BACKGROUND 
     Due to the advantages of the flexible display panel being thin, not fragile, bendable, foldable and wearable, caused the flexible display panel receiving more and more attention. 
     When preparing a flexible display panel, the support plate to be attached needs to be attached to an OLED (Organic Light-Emitting Diode) display, and the bending area of the OLED display does not have the support plate, which attached to both sides of the bending area of the OLED display panel, wherein, there is an OLB (Bonding) area of the OLED display on one side of the bending area. Align the supporting board with the OLED display during attaching the to-be-supported board to the OLED display, then roll the supporting board on the OLED display through an attached contact roller to press the supporting board to the OLED display. However, when using the attached contact roller to roll and press the support plate, the attached contact roller will be pressed into the OLB area of the OLED display, resulting in poor bonding area, causing the OLED display to show abnormal. 
     SUMMARY 
     In order to solve the above technical problem, the present invention provides a preparation method of a foldable display panel, when attaching the supporting plate to the OLED display panel, the attached contact roller does not press to the OLB area of the OLED display screen, will not cause the OLED to show abnormal. 
     The present invention provides a preparation method of a foldable display panel, comprising the following steps: preparing two pressing lines on a support plate to be attached, the two pressing lines dividing the support plate into a first region, a second region, and a third region, and the second region is located between the first region and the third region; attaching the first region and the second region onto an OLED display screen through a attached contact roller to sequentially, and attaching the third region to the OLED display screen, wherein the second region is opposite to a bending area of the OLED display screen, the third region is facing to an OLB area of the OLED display screen; tearing off the second region; 
     Preferably, the two pressing lines are parallel to each other. 
     Preferably, also includes the following steps: 
     bending over the OLED display screen, to paste the first region and the third region together. 
     Preferably, a peripheral wiring area of the OLED display screen is located at the bending area. 
     Preferably, the pressing lines comprise a plurality of via holes arranged at interval. 
     Preferably, when the support plate is attached on the OLED display screen, projection of the via hole on the OLED display screen is rectangular. 
     Preferably, ratio of length of the via hole on the pressing line to a connection length between the adjacent via holes is 1 or 2. 
     The present invention also provides a preparation method of a foldable display panel, comprising the following steps: preparing two pressing lines on a support plate to be attached, the two pressing lines dividing the support plate into a first region, a second region, and a third region, and the second region is located between the first region and the third region; attaching the first region and the second region to the OLED display screen through an attached contact roller to sequentially, and attaching the third region to the OLED display screen naturally, wherein the second region is opposite to a bending area of the OLED display screen, the third region is facing to an OLB area of the OLED display screen; tearing off the second region; wherein, the two pressing lines are parallel to each other. 
     Preferably, also includes the following steps: 
     bending over the OLED display screen, in order to paste the first region and the third region together. 
     Preferably, a peripheral wiring area of the OLED display screen is located at the bending area. 
     Preferably, the pressing line comprises a plurality of via holes arranged at interval. 
     Preferably, when the support plate is attached on the OLED display screen, projection of the via hole on the OLED display screen is rectangular. 
     Preferably, ratio of length of the via hole on the pressing line to a connection length between the adjacent via holes is 1 or 2. 
     The present invention also provides a preparation method of a foldable display panel, comprising the following steps: 
     preparing two pressing lines on a support plate to be attached, the two pressing lines dividing the support plate into a first region, a second region, and a third region, and the second region is located between the first region and the third region;
 
attaching the first region and the second region to the OLED display screen through an attached contact roller sequentially, and attaching the third region to the OLED display screen naturally, wherein the second region is opposite to a bending area of the OLED display screen, the third region is facing to an OLB area of the OLED display screen; tearing off the second region;
 
     The preparation method of the foldable display panel, also comprising the following steps: bending over the OLED display screen, in order to paste the first region and the third region together. 
     Preferably, the two pressing lines are parallel to each other. 
     Preferably, a peripheral wiring area of the OLED display screen is located at the bending area. 
     Preferably, the pressing line comprises a plurality of via holes arranged at interval. 
     Preferably, when the support plate is attached on the OLED display screen, projection of the via hole on the OLED display screen is rectangular. 
     Preferably, ratio of length of the via hole on the pressing line to a connection length between the adjacent via holes is 1 or 2. 
     The implementation of the present invention has the following beneficial effects: when use the attached contact roller to roll and press the support plate, only the first region and the second region are rolled; and when the first region and the second region are attached to the OLED display screen, because the third region are located on the same support plate as the first region and the second region. Therefore, the third region can be naturally attached to the OLED display screen by the residual force of the attached roller, and does not need to roll and press through the attached contact roller, and also the OLB area of the OLED display will not roll and press onto and the third area of the support plate can be well attached to the OLED display, also will not result a bad bonding area and affect the showing of the OLED display screen. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the present invention 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 of the following description merely Is some embodiments of the present invention, for those skilled in the art, without any creative work under the premise can also be based on these drawings to obtain other drawings. 
         FIG. 1  is a flowchart of a preparation method of a foldable display panel provided by the present invention. 
         FIG. 2  is a schematic diagram of a support plate of preparing pressing line provided by the present invention. 
         FIG. 3  is a cross-sectional view of the support plate of  FIG. 2  provided by the present invention, taken along the line A-A after being attached to the OLED display panel. 
         FIG. 4  is a schematic diagram of removing the second region in  FIG. 3  provided by the present invention. 
         FIG. 5  is a schematic diagram of bending the flexible foldable display panel of  FIG. 4  provided by the present invention. 
         FIG. 6  is an enlarged schematic diagram of a pressing line provided by the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     The present invention provides a preparation method of a foldable display panel, comprising the following steps: 
     As shown in  FIG. 2 , two pressing lines are prepared on a support plate  100  to be attached, and the two pressing lines divide the support plate  100  into a first region  101 , a second region  102  and a third region  103 , and the second region  102  is located between the first region  101  and the third region  103 . Pressing lines as shown in  104  and  105  of  FIG. 2 . 
     As shown in  FIG. 3 , the first region  101  and the second region  102  onto a OLED display screen  110  is attached through a attached contact roller sequentially, and the third region  103  is naturally attached to the OLED display screen  110 , wherein the second region  102  is opposite to a bending area of the OLED display screen  110 , and the third region  103  is facing to an OLB area  108  (also as bonding region) of the OLED display screen  110 . The OLED display screen  110  is a flexible foldable display screen. 
     The second region is tear off, and the sectional view of the flexible foldable display screen after tearing, as shown in  FIG. 4 . 
     Specifically, the first region  101  and the second region  102  are sequentially attached to the OLED display screen  110  through the attached contact roller, i.e. when the support plate  100  is aligned with the OLED display screen  110  and is pasted on the front surface of the OLED, through the attached contact roller roll and press on the support plate  100 , to make the first region  101  and the second region  102  of the support plate  100  paste on the OLED display screen. Herein, the support plate  100  is also a backplane or a film layer, to use for supporting and protecting the OLED display screen. 
     Preferably, the support plate  100  can be a PET material (Polyethylene Terephthalate). 
     Further, the two pressing lines are parallel to each other. 
     Further, the preparation method of the foldable display panel also includes the following steps: 
     As shown in  FIG. 5 , the OLED display screen  110  is bent, so that the first region  101  and the third region  103  are bonded together. Preferably, the first region  101  and the third region  103  can proceed fix by a glue. 
     Further, the bent area  109  is a bending area of the OLED display screen  110 . The peripheral wiring area of the OLED display screen  110  is located in the bending area. 
     Further, as shown in  FIG. 6 , the pressing line includes a plurality of via holes  106  arranged at interval. 
     Further, when the support plate  100  is attached to the OLED display  110 , and the projection of the via hole  106  on the OLED display  110  is rectangular. 
     Further, ratio of the length of the via hole  106  on the pressing line to connection length  107  of the adjacent via holes is 1 or 2, or some other value. The length of the via hole  106  is the length of the pressing line length direction. 
     To sum up, in the preparation method of a foldable display screen provided by the present invention, when the support plate  100  attaches to the OLED display screen  110 , two pressing line are prepared on the support plate  100  in advance, to obtain the corresponding first region  101 , the second region  102  and the third region  103 . The support plate  100  is aligned with the OLED display screen  110 , such that the second region  102  opposites to the bending area  109  of the OLED display screen  110 . The third region  103  faces the OLED in the OLB region  108  of the display screen  110  when the attached contact roller  100  is used to roll the support plate  100 . Only the first region  101  and the second region  102  are rolled. When the first region  101  and the second region  102  are attached to the OLED display screen  110 , since the third region  103  and the first region  101  and the second region  102  are located on the same support plate  100 , so the third region  103  can be naturally attached to the OLED display  110  (that is, by the residual force of the attached roller) and the display does not need to be rolled by the attached contact roller and thus will not roll and press the OLB area  108  of the OLED display screen  110 , and the third region  103  of the support plate  100  can be well attached to the OLED display screen  110 . The disclosure also will not result in bad bonding area to affect the display of the OLED display screen  110 . 
     Before the OLED display screen  110  is bent, tearing off the second region  102  is tear off, so that the disclosure can proceed a good folding of the OLED display screen  110 . The pressing line is a slit, and some of the material on the slit is linked at both ends, and some of the material is disconnected, so it is easier to tear off, and only the area between the pressing line is torn off, the first region  101  and the third region  103  on both side of the pressing line are not affected by the tearing action. 
     The above contents are a combine preferable specific implement manner further detailed description to this present invention, and it should not be considered that the specific implementation of the present invention is limited to these descriptions. For those ordinary skilled in the art area of the present invention, a number of simple deductions or replacements may be made without departing from the concept of the present invention, and should be considered as belonging to the scope of protection of the present invention.