阅读说明：本技术 曲面显示面板的成型设备及其成型方法、曲面显示面板 (Forming equipment and forming method of curved surface display panel and curved surface display panel ) 是由 何平 孙亮 于 2021-09-10 设计创作，主要内容包括：公开一种曲面显示面板的成型设备及其成型方法、曲面显示面板,成型设备包括映射结构和仿形治具,映射结构包括可沿竖直方向移动的多个顶针,顶针一端被配置为与显示面板贴合,仿形治具包括一仿形面,仿形面被配置于映射结构的下方,仿形治具能被驱动以使得所述仿形面贴合所述顶针远离所述显示面板的另一端。仿形治具的仿形面形状可通过映射结构的顶针完全映射到显示面板上,使得成型后的显示面板具有与仿形治具的仿形面相同的曲面形状；此种成型设备所具有的点对点成型方式,能够使得显示面板的整体拉伸过程可控,也能实现较好的成型效果。(The forming equipment comprises a mapping structure and a profiling jig, wherein the mapping structure comprises a plurality of ejector pins capable of moving in the vertical direction, one end of each ejector pin is configured to be attached to the display panel, the profiling jig comprises a profiling surface, the profiling surface is configured below the mapping structure, and the profiling jig can be driven to enable the profiling surface to be attached to the ejector pins and the ejector pins to be far away from the other end of the display panel. The shape of the profiling surface of the profiling jig can be completely mapped onto the display panel through the ejector pin of the mapping structure, so that the formed display panel has the same curved surface shape as the profiling surface of the profiling jig; the point-to-point forming mode of the forming equipment can control the whole stretching process of the display panel and can realize better forming effect.)

1. An apparatus for forming a curved display panel, comprising:

the mapping structure comprises a plurality of thimbles capable of moving along the vertical direction, and one end of each thimble is configured to be attached to the display panel;

the profiling jig comprises a profiling surface, and the profiling surface is arranged below the mapping structure;

the profiling jig can be driven to enable the profiling surface to be attached to the other end, far away from the display panel, of the thimble.

2. The molding apparatus as claimed in claim 1, wherein said contoured surfaces include a first planar contoured surface, a second planar contoured surface, and a curved contoured surface located between said first planar contoured surface and said second planar contoured surface, said first planar contoured surface having a height difference H from said second planar contoured surface, said curved contoured surface having a radius of curvature R, and a pitch between thimbles corresponding to said curved contoured surfaces being P, wherein,

3. the molding apparatus as claimed in claim 2, wherein said thimble comprises a thimble main body, a soft pad at one end of said thimble main body, and a lubricating layer at the other end of said thimble main body, said soft pad being adapted to be attached to said display panel, said lubricating layer being adapted to be attached to said contoured surface.

4. The molding apparatus as defined in claim 3, wherein a surface energy of a cushion of said ejector pins corresponding to said curved contoured surface is less than a surface energy of a cushion of said ejector pins corresponding to said first planar contoured surface.

5. The molding apparatus as defined in claim 4, wherein the mapping structure is attached to the display panel via an adhesive layer, the cushion of the pins corresponding to the contoured surface does not adhere to the adhesive layer, and the cushion of the pins corresponding to the first contoured surface adheres to the adhesive layer.

6. The molding apparatus as defined in claim 5, wherein a cushion of said ejector pins corresponding to said contoured surface is doped with a lubricant.

7. The molding apparatus as claimed in claim 3, wherein the soft pad has an elastic modulus of 1 to 1.4GPa, and the lubricating layer has a surface friction coefficient of 0.02 to 0.10.

8. The molding apparatus as claimed in claim 3, wherein a side surface of said thimble body corresponding to said contoured surface is an uneven surface.

9. The molding apparatus as claimed in claim 8, wherein a coefficient of friction of a side surface of said ejector pin body corresponding to said first planar contoured surface is less than a coefficient of friction of a side surface of said ejector pin body corresponding to said curved contoured surface.

10. The molding apparatus as claimed in claim 3, wherein a spacing between said pins of said first and second planar contoured surfaces is greater than or equal to a spacing between said pins of said curved contoured surfaces.

11. The molding apparatus as claimed in claim 3, wherein said first planar profile and said second planar profile correspond to a width of said ejector pin that is greater than or equal to a width of said ejector pin that corresponds to said curved profile.

12. The molding apparatus of claim 2, wherein said curved contoured surface surrounds said first planar contoured surface, said second planar contoured surface surrounds said curved contoured surface, said first planar contoured surface comprises a rectangular shape, said curved contoured surface comprises an annular shape, and said second planar contoured surface comprises an annular shape.

13. The molding apparatus as claimed in claim 1, wherein said mapping structure comprises a base, said base comprising a plurality of positioning holes, and a plurality of said pins being located in a one-to-one correspondence in said plurality of positioning holes and protruding out of said positioning holes.

14. A method for forming a curved display panel, comprising:

s10, providing a molding device, which comprises a mapping structure and a profiling jig, wherein the mapping structure comprises a plurality of thimbles capable of moving along a vertical direction, and the profiling jig comprises a profiling surface arranged below the mapping structure;

s20, attaching the display panel to be formed to one end of the thimble;

and S30, driving the profiling jig so that the profiling surface is attached to the other end, far away from the display panel, of the thimble.

15. The molding method according to claim 14, wherein said S30 includes:

s301, driving the profiling jig to enable the first plane profiling surface to be attached to the other end, away from the display panel, of the thimble, wherein the portion, corresponding to the first plane profiling surface, of the display panel is not stretched;

and S302, driving the profiling jig to enable the curved surface profiling surface to be attached to the other end, far away from the display panel, of the thimble, wherein the portion, corresponding to the curved surface profiling surface, of the display panel is stretched.

16. A curved display panel, wherein the curved display panel is manufactured by the molding method according to claim 14 or 15.

17. The curved display panel of claim 16, wherein the curved display panel comprises a planar display area and a curved display area disposed around the planar display area, and wherein an outer contour of the curved display area is continuous.

18. The curved display panel of claim 17, wherein the stretching ratio of the flat display area is zero, and the stretching ratio of the curved display area is greater than zero.

19. The curved display panel of claim 18, wherein the stretch ratio of the curved display area gradually increases along a direction from the flat display area to the curved display area.

20. The curved display panel of claim 18, wherein the curved display regions comprise four first curved display regions respectively located at four sides of the flat display region, and a gaussian region connecting two adjacent first curved display regions, and the stretching ratio of the gaussian region is greater than that of the first curved display regions.

Technical Field

The invention relates to the technical field of curved surface display, in particular to a forming device of a curved surface display panel, a forming method of the forming device and the curved surface display panel.

Background

The existing full-screen mobile phone cannot realize a real 100% full screen, but the four-curved-surface mobile phone can realize a real full screen visually by matching with a lifting type or a camera under the screen. However, the flexible display module is difficult to realize because it is required to realize four curved surfaces. Redundant part can appear in four corners when carrying out the 3D laminating of flexible display module assembly, and this part can lead to the laminating fold, influences display effect. In the conventional attaching mode, the display module is attached to the carrier film, and then four curved surfaces are formed by adopting a vacuum adsorption or die pressing mode. The modes have the problems that the forming mode is uncontrollable, the display module is damaged during compression molding, and the like, so that the required four-curved-surface laminating effect is difficult to achieve.

Disclosure of Invention

The embodiment of the invention provides a forming device of a curved display panel, a forming method of the forming device and the curved display panel, and aims to solve the technical problem that the forming mode of the existing curved display panel has uncontrollable risks and can damage the display panel.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention provides a forming device of a curved surface display panel, which comprises:

the mapping structure comprises a plurality of thimbles capable of moving along the vertical direction, and one end of each thimble is configured to be attached to the display panel;

the profiling jig comprises a profiling surface, and the profiling surface is arranged below the mapping structure; the profiling jig can be driven to enable the profiling surface to be attached to the other end, far away from the display panel, of the thimble.

In some embodiments of the present invention, the profiling surfaces include a first planar profiling surface, a second planar profiling surface, and a curved profiling surface located between the first planar profiling surface and the second planar profiling surface, a height difference between the first planar profiling surface and the second planar profiling surface is H, a radius of curvature of the curved profiling surface is R, and a pitch between the thimbles corresponding to the curved profiling surface is P, wherein,

in some embodiments of the present invention, the thimble includes a thimble main body, a soft pad located at one end of the thimble main body, and a lubricating layer located at the other end of the thimble main body, wherein the soft pad is used for being attached to the display panel, and the lubricating layer is used for being attached to the profiling surface.

In some embodiments of the present invention, a surface energy of the cushion of the thimble corresponding to the curved contoured surface is less than a surface energy of the cushion of the thimble corresponding to the first planar contoured surface.

In some embodiments of the present invention, the mapping structure is attached to the display panel by an adhesive layer, the cushion of the thimble corresponding to the curved profiling surface is not bonded to the adhesive layer, and the cushion of the thimble corresponding to the first planar profiling surface is bonded to the adhesive layer.

In some embodiments of the invention, the cushion of the ejector pin corresponding to the curved contoured surface is doped with a lubricant.

In some embodiments of the present invention, the soft pad has an elastic modulus of 1 to 1.4 GPa.

In some embodiments of the present invention, the surface friction coefficient of the lubricating layer is 0.02 to 0.10.

In some embodiments of the present invention, a side surface of the thimble body corresponding to the curved surface-shaped surface is an uneven surface.

In some embodiments of the present invention, a friction coefficient of a side surface of the thimble body corresponding to the first planar contour is smaller than a friction coefficient of a side surface of the thimble body corresponding to the curved contour.

In some embodiments of the present invention, an interval between the thimbles corresponding to the first and second planar profiling surfaces is greater than or equal to an interval between the thimbles corresponding to the curved profiling surfaces.

In some embodiments of the invention, the shape of the thimble comprises a cylinder.

In some embodiments of the present invention, a width of the thimble corresponding to the first planar profiling surface and the second planar profiling surface is greater than or equal to a width of the thimble corresponding to the curved profiling surface.

In some embodiments of the invention, the curved profile surrounds the first planar profile, the second planar profile surrounds the curved profile, the shape of the first planar profile comprises a rectangle, the curved profile comprises a toroid, and the shape of the second planar profile comprises a toroid.

In some embodiments of the present invention, the mapping structure includes a base, the base includes a plurality of limiting holes, and the plurality of thimbles are located in the plurality of limiting holes in a one-to-one correspondence and extend out of the limiting holes.

The embodiment of the invention also provides a forming method of the curved-surface display panel, which comprises the following steps:

s10, providing a molding device, which comprises a mapping structure and a profiling jig, wherein the mapping structure comprises a plurality of thimbles capable of moving along a vertical direction, and the profiling jig comprises a profiling surface arranged below the mapping structure;

s20, attaching the display panel to be formed to one end of the thimble;

and S30, driving the profiling jig so that the profiling surface is attached to the other end, far away from the display panel, of the thimble.

In some embodiments of the present invention, the profiling surfaces include a first planar profiling surface, a second planar profiling surface, and a curved profiling surface located between the first planar profiling surface and the second planar profiling surface, a height difference between the first planar profiling surface and the second planar profiling surface is H, a radius of curvature of the curved profiling surface is R, and a pitch between the thimbles corresponding to the curved profiling surface is P, wherein,

in some embodiments of the invention, the S30 includes:

s301, driving the profiling jig to enable the first plane profiling surface to be attached to the other end, away from the display panel, of the thimble, wherein the portion, corresponding to the first plane profiling surface, of the display panel is not stretched;

and S302, driving the profiling jig to enable the curved surface profiling surface to be attached to the other end, far away from the display panel, of the thimble, wherein the portion, corresponding to the curved surface profiling surface, of the display panel is stretched.

In some embodiments of the invention, the S20 includes:

s201, attaching the display panel to be molded to one side surface of an adhesive layer;

s202, attaching the surface of the other side of the adhesive layer to one end of the ejector pin.

The embodiment of the invention also provides a curved display panel, and the curved display panel is prepared by adopting the forming method of any one of the embodiments.

In some embodiments of the present invention, the curved display panel includes a flat display area and a curved display area disposed around the flat display area, and an outer contour of the curved display area is continuous.

In some embodiments of the present invention, the stretching ratio of the flat display area is zero, and the stretching ratio of the curved display area is greater than zero.

In some embodiments of the present invention, the stretching ratio of the curved display area gradually increases along a direction in which the flat display area points to the curved display area.

In some embodiments of the present invention, the curved display areas include four first curved display areas respectively located on four sides of the flat display area, and a gaussian area connecting two adjacent first curved display areas, and a stretch ratio of the gaussian area is greater than that of the first curved display areas.

The invention has the beneficial effects that: the forming equipment provided by the embodiment of the invention comprises a mapping structure and a profiling jig, wherein the mapping structure comprises a plurality of thimbles which can move along the vertical direction, the profiling jig comprises a profiling surface arranged below the mapping structure, after one ends of the thimbles are attached to a display panel, the profiling jig is driven to ascend to the other ends of the profiling surface attached to the thimbles, the thimbles at different positions are displaced to different degrees in the process, so that the profiling surface shape of the profiling jig is completely mapped onto the display panel through the thimbles of the mapping structure, and the formed display panel has the same curved surface shape as the profiling surface of the profiling jig; the point-to-point forming mode of the forming equipment can control the whole stretching process of the display panel and can realize better forming effect.

Drawings

Fig. 1 is a schematic structural view of a display panel before being molded and attached to a molding apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a formed display panel and a forming apparatus in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a mapping structure according to an embodiment of the invention;

FIG. 4 is a schematic diagram of a mapping structure according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of a profiling fixture according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a thimble according to an embodiment of the present invention;

fig. 7 is a schematic front view of a mapping structure of a display panel after molding according to an embodiment of the invention;

FIG. 8 is a schematic diagram of a reverse side of a mapping structure before forming a display panel according to an embodiment of the invention;

FIG. 9 is a schematic diagram of a display panel before and after stretching when the cushion is not doped with a lubricant according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a display panel before and after stretching when a cushion is doped with a lubricant according to an embodiment of the present invention;

fig. 11 is a schematic plan view of a display panel according to an embodiment of the present invention before and after forming;

FIG. 12 is a flowchart illustrating steps of a method for forming a display panel according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a display panel forming process according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a curved display panel in a flat state and a curved state according to an embodiment of the present invention;

fig. 15 is a schematic structural view of a curved display panel in a flat state according to the prior art.

Detailed Description

The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "vertical," and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. 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.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural view of a display panel before being formed and a forming device, and fig. 2 is a schematic structural view of a display panel after being formed and a forming device. The embodiment of the invention provides a forming apparatus 100 for a curved display panel, the forming apparatus 100 includes a mapping structure 20 and a profiling fixture 10, the mapping structure 20 includes a plurality of ejector pins 21 movable in a vertical direction, the profiling fixture 10 includes a profiling surface 11, and the profiling surface 11 is disposed below the mapping structure 20. One end of the thimble 21 is configured to be attached to the display panel 200, and the profiling fixture 10 can be driven to attach the profiling surface 11 to the other end of the thimble 21 far away from the display panel 200. In the process that the profiling fixture 10 is driven, the thimbles 21 at different positions are displaced in different degrees successively, so that when the profiling surface 11 rises to be completely attached to the thimbles 21, the shape of the profiling surface 11 of the profiling fixture 10 is completely mapped onto the display panel 200 through the thimbles 21 of the mapping structure 20, and the formed display panel 200 has the same curved surface shape as the profiling surface 11 of the profiling fixture 10; the forming device 100 provided by the embodiment of the invention has the characteristic of point-to-point forming, can control the whole stretching process of the display panel, and can realize a better forming effect.

Referring to fig. 3 and 4, fig. 3 is a schematic front view of a mapping structure according to an embodiment of the invention, and fig. 4 is a schematic back view of the mapping structure according to the embodiment of the invention. The mapping structure 20 includes a base 22, the base 22 includes a plurality of limiting holes (not shown in the figure), the limiting holes are distributed in the middle of the base 22 in an array manner, and the plurality of thimbles 21 are located in the limiting holes in a one-to-one correspondence manner and extend out of the limiting holes. The limiting holes play a role of clamping and fix each thimble 21 at a set position. The stopper hole is configured to allow the thimble 21 to move in the vertical direction, but not to allow the thimble 21 to move in the horizontal direction.

It is understood that, when the mapping structure 20 is not used for stretch-forming the display panel into a curved display panel, the pins 21 of the mapping structure 20 are in a reset state, where the reset state refers to that one ends of all the pins 21 for attaching to the display panel 200 are flush with each other, and the other ends for attaching to the curved surface 11 are flush with each other.

Specifically, referring to fig. 1, the profiling surface 11 includes a first planar profiling surface 111, a second planar profiling surface 112, and a curved profiling surface 113 located between the first planar profiling surface 111 and the second planar profiling surface 112. The molding apparatus having the shape of the above-described copying surface 11 in the embodiment of the present invention may be used for molding a four-sided curved display panel, but is not limited thereto, and by designing the shape of the copying surface 11, the molding apparatus may be used for molding a curved display panel of any shape.

Referring to fig. 1 and 5, in an embodiment of the present invention, the curved surface 113 corresponds to at least 3 of the ejector pins 21, the curved surface 113 includes an arc surface having at least one curvature, and the first planar surface 111 and the second planar surface are curvedThe height difference between the surfaces 112 is H, the curvature radius of the curved surface-shaped surface 113 is R, and the distance between the thimbles 21 corresponding to the curved surface-shaped surface 113 is P, wherein (2P)²≤R²-(R-H)²I.e. byThe thimble 21 corresponding to the curved surface profiling surface 113 refers to a thimble 21 that can be attached to the curved surface profiling surface 113, that is, the thimble 21 corresponding to the region above the curved surface profiling surface 113, in other words, the thimble 21 corresponding to the curved surface profiling surface 113 refers to the thimble 21 attached to the portion of the display panel 200 to be molded into a curved surface.

Referring to fig. 6, specifically, the thimble 21 includes a thimble main body 211, a soft pad 212 located at one end of the thimble main body 211, and a lubricating layer 213 located at the other end of the thimble main body 211, where the soft pad 212 is used for being attached to the display panel 200, and the lubricating layer 213 is used for being attached to the profiling surface 11.

Because the upper end of the thimble 21 needs to be attached to the display panel 200, in order to prevent the thimble 21 from damaging the display panel 200 during the lifting process, the soft pad 212 is disposed at one end of the thimble main body 211, so as to protect the display panel 200. Preferably, the elastic modulus of the soft pad 212 is 1-1.4 GPa, and the display panel 200 can be effectively prevented from being damaged within the elastic modulus range.

In some embodiments of the present invention, the material of the soft pad 212 includes silicon gel, and a surface of the soft pad 212, which is attached to the display panel 200, may be a spherical surface.

Because the lower end of the thimble 21 needs to be attached to the profiling jig 10, the thimble 21 is driven by the profiling jig 10 to move upwards along the vertical direction. In order to avoid the friction coefficient between the thimble 21 and the profiling jig 10 from being too large, a lubricating layer 213 is disposed at the other end of the thimble main body 211 to perform the functions of lubrication and wear prevention. Preferably, the surface friction coefficient of the lubricating layer 213 is 0.02-0.10, and within the friction coefficient range, the wear between the thimble 21 and the profiling jig 10 can be effectively reduced.

In some embodiments of the present invention, the material of the lubricating layer 213 includes a fluororesin having a lubricating effect, and the fluororesin may be a teflon material. The lubricating layer 213 can be formed by coating a layer of teflon material on the portion of the thimble body 211 that needs to contact the profiling fixture 10.

The entirety of the thimble 21 may be cylindrical, and specifically, the thimble main body 211 may be cylindrical. In the embodiment of the present invention, the side surface of the thimble main body 211 corresponding to the curved surface profiling surface 113 is an uneven surface, so as to increase the damping of the side surface of the thimble main body 211 corresponding to the curved surface profiling surface 113, so that the thimble 21 moves up slowly, and the adjacent thimble 21 not jacked by the curved surface profiling surface 113 is not driven by the display panel to move upward, thereby increasing the displacement accuracy of the thimble 21 at each point corresponding to the curved surface profiling surface 113, and further improving the accuracy of mapping the shape of the curved surface profiling surface 113 onto the display panel.

In the embodiment of the present invention, since the surface of the first planar profiling surface 111 is a plane, and the rising displacement of each of the corresponding ejector pins 21 is the same, and no stretching occurs, the side surface of the ejector pin body 211 corresponding to the first planar profiling surface 111 does not need to be processed by a concave-convex structure, and the friction coefficient of the side surface of the ejector pin body 211 corresponding to the first planar profiling surface 111 is smaller than the friction coefficient of the side surface of the ejector pin body 211 corresponding to the curved profiling surface 113.

In some embodiments of the present invention, a side surface of the thimble body 211 corresponding to the curved surface-shaped surface 113 has a concave-convex structure, and the concave-convex structure is formed by performing a frosting process on the side surface of the thimble body 211 to increase surface roughness. Damping liquid can be coated on the side surface of the thimble main body 211 to increase surface damping.

The material of the thimble main body 211 includes a metal material such as stainless steel or a hard material.

The molding apparatus 100 of the embodiment of the present invention is applicable to molding of a display panel of a small size (e.g., a mobile phone size), the spacing S between the center lines of adjacent pins 21 is less than 1 mm, and the cylindrical diameter W of the pin body 211 is less than or equal to 0.5 mm. In other embodiments, the molding apparatus 100 can be used in large-scale (e.g. television) products, and the actual size of the ejector pin 21 can be designed according to the size of the molded product and the area of the region to be stretched.

The first planar surface profile 111 and the second planar surface profile 112 are both planar surface profiles, so that the heights of the plurality of ejector pins 21 corresponding to the respective planar surface profiles are the same, and the portions of the display panel 200 corresponding thereto are not stretched, while the curved surface profile 113 is a curved surface profile, and the heights of the ejector pins 21 corresponding thereto are different, and the portions of the display panel 200 corresponding thereto are stretched and deformed. Therefore, in some embodiments, the density of the thimbles 21 corresponding to the first and second planar contoured surfaces 111 and 112 can be smaller, and the size of the corresponding thimbles 21 can be larger, that is, the distance between the thimbles 21 corresponding to the first and second planar contoured surfaces 111 and 112 is greater than or equal to the distance between the thimbles 21 corresponding to the curved contoured surfaces 113, and the width of the thimbles 21 corresponding to the first and second planar contoured surfaces 111 and 112 is greater than or equal to the width of the thimbles 21 corresponding to the curved contoured surfaces 113. In the present embodiment, the width of the thimble 21 refers to the width of the cross section of the thimble main body 211 of the thimble 21, and when the thimble main body 211 is in the shape of a cylinder, the width of the thimble 21 refers to the diameter of the thimble main body 211.

In an embodiment of the present invention, referring to fig. 1 and fig. 2, the curved contoured surface 113 surrounds the first planar contoured surface 111, the second planar contoured surface 112 surrounds the curved contoured surface 113, the shape of the first planar contoured surface 111 includes a rectangle, the curved contoured surface 113 includes a ring, and the shape of the second planar contoured surface 112 includes a ring. The profiling jig 10 with the above structure can map the graph of the profiling surface 11 onto the display panel 200 above the thimble 21 through the thimble 21, and form the display panel 200 to be formed into a display panel with four curved surfaces, so as to realize a real full screen.

Referring to fig. 7 and 8, fig. 7 is a schematic front view of a mapping structure after a display panel is formed, and fig. 8 is a schematic back view of the mapping structure before the display panel is formed. In the molding process, the profiling surface 11 moves towards the direction of adhering to the lubricating layer 213 of the thimble 21, under the action of the profiling jig 10, the display panel 200 is jacked up by the thimble 21, at this time, the portion of the display panel 200 corresponding to the profiling surface 113 is locally stretched, the stretching deformation increases along with the increase of the upward movement amount of the thimble 21, until the profiling surface 11 and one end of the thimble 21 far away from the display panel 200 are completely adhered, so that the molding of the display panel 200 is completed, and the molded display panel, the pattern formed by the plurality of thimbles 21 corresponding to the profiling surface 11 and the profiling surface 11 have the same shape. The forming method does not need hot pressing or vacuum adsorption, can realize the forming of the display panel 200 at normal temperature and normal pressure, has controllable forming process, and can also avoid the damage to the display panel 200.

Further, in some embodiments of the present invention, the soft pad 212 of the thimble 21 corresponding to the curved surface-shaped surface 113 is doped with a lubricant to reduce the surface energy of the soft pad 212 corresponding to the curved surface-shaped surface 113, so that when the soft pad 212 is in contact with the display panel 200, and the portion of the display panel 200 corresponding to the curved surface-shaped surface 113 is stretched, the display panel 200 will slide left and right relative to the thimble 21, the stretching deformation will transition to two sides, and the local stress concentration of the display panel during the stretching deformation can be effectively reduced. The surface energy mentioned in the embodiment of the present invention means the energy which is excessive on the surface of the material relative to the inside of the material, and the lower the surface energy of the adherend, the poorer the wettability, and the poorer the adhesion effect.

Specifically, the display panel 200 is attached to the thimble 21 by an adhesive layer (not shown). By performing the surface energy reduction treatment on the cushion 212 corresponding to the curved profiling surface 113, the surface energy is determined to be low enough to enable the cushion 212 not to be bonded with the adhesive layer, and the cushion 212 corresponding to the first planar profiling surface 111 does not stretch and deform, so that the cushion 212 of the thimble 21 corresponding to the first planar profiling surface 111 does not need to be subjected to the surface energy reduction treatment, and the cushion 212 of the thimble 21 corresponding to the first planar profiling surface 111 is bonded with the adhesive layer to play a role in fixing, thereby preventing the display panel 200 from being displaced in the forming process.

The lubricant includes a fluororesin. Specifically, the cushion 212 may be swollen by placing it in an organic solvent (alcohol, xylene, etc.) and then placed in a fluororesin solution to make the fluororesin invade into the tissue of the cushion, and after the solvent is volatilized, the fluororesin will be enclosed in the cushion, and the cushion thus treated has the characteristic that the lubricating coating is not easy to fall off, has lasting lubricity, has low surface energy, and cannot be bonded with a viscose layer such as OCA. In other embodiments, a layer of fluorine resin solution can be directly coated on the surface of the soft pad, but the coating is easy to fall off after being used for a period of time, and the lubricity can be reduced. The fluororesin can be Teflon, the surface tension of the Teflon is only 0.019N/m, the surface energy is small, and the bonding performance with adhesive layers such as OCA (epoxy acrylate copolymer) and the like is poor. The surface energy design of the cushion is determined by the type of the selected lubricant such as fluorine resin and the type of the adhesive layer.

In the display panel forming process, the display panel that curved surface profile surface 113 corresponds takes place local stretch, the displacement of different degrees takes place for a plurality of thimbles 21 that curved surface profile surface 113 corresponds, display panel's tensile deformation increases along with the increase of thimble upward movement volume, because the top of the thimble 21 that curved surface profile surface 113 of this embodiment corresponds has the cushion of low surface energy, the cushion does not bond with the viscose layer, display panel can take place slight slip along the plane direction, consequently, display panel 200 here tensile deformation can be to both sides transition, this kind of transition can effectively reduce the local stress concentration of display module in tensile deformation's whole in-process.

Referring to fig. 9 and 10, fig. 9 is a schematic view of the display panel before and after stretching when the soft pad is not doped with the lubricant, and fig. 10 is a schematic view of the display panel before and after stretching when the soft pad is doped with the lubricant. As shown in a and b of fig. 9, since no lubricant is added, the soft pad is bonded and fixed to the display panel 200 by the adhesive layer, and the thimble 21 and the display panel 200 are not slidable, and at this time, the area where the display panel is deformed by stretching is the area corresponding to the curved surface 113, and the perimeter of the cross section where the display panel is deformed is stretched from L1 to L1'. As shown in a and b of fig. 10, the pad of the thimble 21 corresponding to the curved profiling surface 113 is doped with lubricant, the surface energy of the pad is reduced, and the portion of the display panel corresponding to the thimble 21 can slide horizontally, at this time, the area where the display panel 200 participates in the tensile deformation is expanded (from L1 to L2) on the basis of the area corresponding to the curved profiling surface 113, and the perimeter of the cross section where the display panel participates in the deformation is stretched from L2 to L2 ', and since the shapes of the profiling surfaces 11 of the profiling jigs 10 corresponding to the two stretching modes are the same, Δ L is L1 ' -L1, and L2 ' -L2.

Referring to fig. 11, a of fig. 11 is a schematic plan view of the display panel before and after molding when no lubricant is added, and b of fig. 11 is a schematic plan view of the display panel before and after molding when the soft pad 212 of the thimble 21 corresponding to the curved profiling surface 113 is doped with the lubricant. The thimble 21 doped with lubricant is adopted to increase the original area of the display panel 200 participating in the stretching deformation from S1 to S2, and the area Δ S of the actual deformation after stretching is Δ L × C, where C is the perimeter of the junction where the curvature of the curved edge portion of the display panel changes abruptly, and C is a constant because the shape of the profiling jig 10 is not changed. The stretch ratio of the display panel is Δ S/S, and Δ S/S is (Δ L × C)/S, so the stretch ratio of the display panel is related to the area of the region participating in the tensile deformation, and the greater the area of the region participating in the tensile deformation, the smaller the stretch ratio of the display panel. The design that the soft pad of thimble is mixed with the emollient can make display panel have the bigger region and participate in tensile, and the less the tensile rate of display panel in tensile process is, the more easily reaches the effect of curved surface laminating and improves bending forming's success rate.

In an embodiment of the present invention, the display panel 200 is a stretchable display panel, and includes any one of an OLED display panel and a Micro LED display panel.

The display panel 200 has a stretchable island bridge structure, and includes a plurality of pixel islands and a connecting bridge for connecting two adjacent pixel islands, the pixel islands are provided with pixel driving circuits and pixel light emitting units electrically connected with the pixel driving circuits, and the connecting bridge is provided with a plurality of wires electrically connected with the pixel driving circuits on the two adjacent pixel islands. The shape of the connecting bridge includes a snake shape or an S shape, the pixel island may be a rigid island, and when the display panel 200 is deformed by stretching, the connecting bridge participates in stretching, and the pixel island is not stretched, so that devices on the pixel island are protected from being affected.

The display panel 200 may further include a first flexible supporting layer disposed on one side of the pixel islands and the connection bridges, and a second flexible supporting layer disposed on the other side of the pixel islands and the connection bridges, where the first flexible supporting layer and the second flexible supporting layer play a role in supporting and protecting, so as to prevent the pixel islands and the connection bridges from being distorted and deformed during the stretching process of the display panel 200. The material of the first flexible support layer and the second flexible support layer includes a PDMS (Polydimethylsiloxane) substrate with excellent elasticity.

Compared with the conventional display panel, the display panel 200 with the tensile property has the advantages that when the display panel is subjected to 3D lamination to realize four-curved-surface display, the display panel can be subjected to local tensile deformation under the action of external force, redundant parts cannot appear at four corners, and wrinkles cannot appear. The display panel 200 with the above-mentioned stretchable property can be stretched from a planar state to a desired specific quadric-curved state under the action of the forming apparatus 100 according to the embodiment of the present invention, and the forming manner of the forming apparatus 100 according to the embodiment of the present invention can be performed at normal temperature, and at the same time, the stretching deformation process of the whole display panel 200 can be controlled.

Referring to fig. 12 and fig. 13, based on the forming apparatus 100 in the above embodiment, an embodiment of the present invention further provides a forming method of a curved display panel, including: s10, providing a molding apparatus 100, comprising a mapping structure 20 and a profiling fixture 10, wherein the mapping structure 20 comprises a plurality of ejector pins 21 capable of moving in a vertical direction, and the profiling fixture 10 comprises a profiling surface 11 disposed below the mapping structure 20; s20, attaching the display panel 200 to be formed to one end of the thimble 21; s30, driving the profiling fixture 10 to make the profiling surface 11 attach to the other end of the thimble 21 away from the display panel 200.

Specifically, the display panel 200 to be formed is attached to one side surface of an adhesive layer; the other side surface of the adhesive layer is attached to one end of the thimble 21.

It can be understood that when the display panel to be formed is attached to the pins 21 by the adhesive layer, all the pins 21 of the mapping structure 20 are in the reset state, i.e. the end portions of the same side of all the pins 21 are in the same horizontal plane.

The profiling surface 11 and the attachment of the thimble 21 include: s301, driving the profiling fixture 10 until the first planar profiling surface 111 is attached to the other end of the thimble 21 away from the display panel 200, wherein the portion of the display panel 200 corresponding to the first planar profiling surface 111 is not stretched.

S302, driving the profiling jig 10 until the curved profiling surface 113 is attached to the other end of the thimble 21 away from the display panel 200, wherein the portion of the display panel 200 corresponding to the curved profiling surface 113 is stretched, and in this process, the thimble 21 corresponding to the first planar profiling surface 111 also moves upward in the vertical direction, so that the area of the display panel corresponding to the first planar profiling surface 111 is jacked up upward, but is not stretched.

Based on the application of the forming method and the forming equipment, the embodiment of the invention also provides the curved-surface display panel which is prepared by the forming method. Referring to fig. 14, fig. 14 is a schematic structural diagram of the curved display panel in a flat state and a curved state. The curved display panel 200 includes a flat display area 201 and a curved display area 202, the flat display area 201 is surrounded by the curved display area 202, the flat display area 201 corresponds to the first flat copying surface 111, and the curved display area 202 corresponds to the curved copying surface 113. The curved display panel 200 is a stretchable display panel, and reference may be made to the foregoing description for the stretchable display panel.

Referring to fig. 14, in the embodiment of the invention, the outer contour of the curved display area 202 of the curved display panel 200 is continuous, and the embodiment of the invention can form a four-sided curved shape without performing special-shaped cutting on the corners of the curved display panel 200. In the prior art, as shown in fig. 15, fig. 15 is a schematic structural diagram of a curved display panel in the prior art in a flat state, and in order to prevent the display panel from wrinkling at the corners during the curved surface forming process, irregular cutting is performed at the corners of the display panel to form a notch 203, where the outer contour of the curved display area 202 of the prior art display panel is discontinuous and has a notch design.

Further, since the heights of the two-dimensional display area 201 raised up are the same, the two-dimensional display area 201 is not stretched, and the stretching ratio of the two-dimensional display area 201 is zero. Because the display surface of the curved display area 202 is a curved surface, and the heights of different positions of the curved display area are different, the curved display area 202 is stretched, and the stretching ratio of the curved display area 202 is greater than zero.

When the curved display panel 200 is placed on a horizontal plane (i.e. the horizontal plane is parallel to the plane where the flat display area 201 is located), the unit area of the horizontal plane is S₀The actual area of the curved display panel 200 facing each other in the unit area of the horizontal plane is S_AThe stretching ratio of the curved display panel 200 having a curved shape may be defined as: (S)_A-S₀) And S₀The ratio of (a) to (b). The measurement of the actual area of the curved display panel 200 facing the curved display panel in the unit area may be obtained by scanning and calculating using a 3D measuring instrument. The larger the stretching ratio of a certain region of the curved display panel 200 is, the larger the curvature thereof is, and the larger the stretching degree thereof is.

In an embodiment of the present invention, referring to fig. 14, in the curved display panel 200, along a direction in which the flat display area 201 points to the curved display area 202, a stretching ratio of the curved display area 202 gradually increases, and a stretching degree thereof gradually increases.

Specifically, the curved display panel 200 may be a four-curved display panel, and the curved display area 202 includes first curved display areas 2021 respectively located at four sides of the flat display area 201, and a gaussian area 2022 connecting two adjacent first curved display areas 2021, where a stretch ratio of the gaussian area 2022 is greater than a stretch ratio of the first curved display areas 2021.

Compared with the prior art in fig. 15, the gaussian region 2022 according to the embodiment of the present invention does not need to be subjected to special-shaped cutting, and there is no seam between two adjacent first curved surface display regions 2021. In the prior art, the curved display area has a seam due to the fact that the notches 203 are formed by performing special-shaped cutting at the corners.

The first curved display area 2021 corresponding to each side of the flat display area 201 is stretched along a direction perpendicular to the side, that is, the first curved display area 2021 is stretched along only one direction. The gaussian region 2022 is located at a corner of the curved display panel 200, and is adjacent to the first curved display region 2021 with two different stretching directions, so that the gaussian region 2022 is stretched in two directions, and the stretching degree of the gaussian region 2022 is greater than that of the first curved display region 2021.

To sum up, the embodiment of the present invention provides a curved display panel forming apparatus and a forming method thereof, and a curved display panel, wherein the forming apparatus 100 includes a mapping structure 20 and a profiling fixture 10, the mapping structure 20 includes a plurality of ejector pins 21 capable of moving along a vertical direction, the profiling fixture 10 includes a profiling surface 11 disposed below the mapping structure 20, after one end of the ejector pin 21 is attached to the display panel 200, the profiling fixture 10 is driven to ascend to the other end of the profiling surface 11 attached to the ejector pin 21, the ejector pins 21 at different positions are displaced to different degrees in the process, so that the profiling surface 11 of the profiling fixture 10 is completely mapped onto the display panel 200 through the ejector pin of the mapping structure 20, and the formed display panel has a curved shape identical to the profiling surface 11 of the profiling fixture 10; the point-to-point forming mode of the forming equipment can control the whole stretching process of the display panel and can realize better forming effect.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above describes in detail a curved display panel forming apparatus, a curved display panel forming method, and a curved display panel provided in the embodiments of the present invention, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.