CN112599007A - Flexible protective layer and flexible display panel - Google Patents
Flexible protective layer and flexible display panel Download PDFInfo
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- CN112599007A CN112599007A CN202011465283.9A CN202011465283A CN112599007A CN 112599007 A CN112599007 A CN 112599007A CN 202011465283 A CN202011465283 A CN 202011465283A CN 112599007 A CN112599007 A CN 112599007A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
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Abstract
The embodiment of the invention discloses a flexible protective layer and a flexible display screen, wherein a first groove extending along a first direction, a supporting strip arranged on the bottom surface of the first groove and a first filling strip covering the supporting strip are arranged on the first surface of the flexible protective layer; a second end of the first filling strip, which extends along the second direction, is provided with a limiting bulge extending towards the first groove; under a normal state, the orthographic projection of the limiting bulge on the flexible protective layer is partially overlapped with the orthographic projection of the supporting strip on the flexible protective layer; under the bending state, the limiting bulge is filled between the supporting bar and the second side wall of the first groove. When the flexible protective layer is bent, the limiting protrusions on the first filling strips are displaced relative to the supporting strips and filled between the supporting strips and the second side walls of the first grooves; the limiting structure is beneficial to reducing the extrusion force of the flexible protective layer on the first surface when the flexible protective layer is bent, a locking structure is formed, and the rebound tendency of the flexible protective layer in a bending area is relieved.
Description
Technical Field
The application relates to the field of display, in particular to a flexible protective layer and a flexible display panel with the flexible protective layer arranged inside.
Background
In recent years, with the development of display technology, Organic light-emitting diode (OLED) display panels are gradually coming into the public. The current display panel is provided with a binding region for binding and electrically connecting with other electronic devices to drive the display panel to normally work. Because the binding region cannot display images and affects the screen occupation ratio, in order to realize full screen display, the edge of the flexible display panel is usually designed to be a curved surface, and the binding region of the display panel is bent to the back side of the display region through a Pad Bending process, so that the flexible display panel meets the requirement of edge display and the screen occupation ratio is improved.
However, the Pad bonding process becomes difficult. Since the FPC needs to be folded to the rear of the screen body and adhered in the Pad bonding process, a protective layer is generally provided under the FPC. The protection layer is generally in a flat plate shape, and when PAD bonding is performed, the flat plate protection layer needs to be bent at a fillet area of the four-curved cover plate, so that stress at a bending position is concentrated, the flat plate protection layer has a rebound tendency, a delamination (peeling) phenomenon occurs between the protection layer and an upper-lower layer structure, and the product yield is affected.
Disclosure of Invention
The embodiment of the application provides a flexible protection layer and a flexible display panel, which are used for releasing the stress of the flexible protection layer in a bending state, reducing resilience, further reducing the layering phenomenon of a bending area of a flexible protection screen applying the flexible protection layer, and improving the PAD bonding yield.
According to a first aspect of the present invention, a flexible protection layer is provided, which has a first surface and a second surface arranged oppositely, the first surface is provided with a first groove extending along a first direction, a support bar arranged on the bottom surface of the first groove, and a first filling bar covering the support bar; the first end of the first filling strip extending along the second direction is integrally formed with the first side wall of the first groove, and the second end of the first filling strip extending along the second direction is provided with a limiting protrusion extending towards the first groove;
the flexible protection layer has a normal state and a bending state, and in the normal state, the orthographic projection of the limiting protrusion on the flexible protection layer is partially overlapped with the orthographic projection of the supporting strip on the flexible protection layer; in the bent state, the limiting protrusions are filled between the supporting bars and the second side walls of the first grooves;
the first direction is perpendicular to the second direction, and a first side wall and a second side wall of the first groove are arranged oppositely.
In one embodiment, in the normal state, along the second direction, the overlapping width of the orthographic projection of the limiting protrusion on the flexible protection layer and the orthographic projection of the supporting strip on the flexible protection layer is Δ s1, and the Δ s1 is 1-3 mm; and in the bending state, the bending R value of the flexible protection layer is 2.5-4 mm.
In one embodiment, along the second direction, the width of the limiting protrusion is equal to the distance between the supporting bar and the second side wall of the first groove;
in one embodiment, the thickness of the limiting protrusion is smaller than that of the supporting bar.
In one embodiment, the second surface is provided with a second groove extending along the first direction, and a second filling strip matched with the second groove, and a first end of the second filling strip extending along the second direction is integrally formed with a side wall of the second groove;
in the normal state, the first filling strip covers the second groove, and a second end of the second filling strip extends to the outside of the second groove along the second direction; and in the bent state, the second filling strip is filled in the second groove.
In one embodiment, in the second direction, the distance between the edge of the second end of the second filler strip and the side edge of the second groove closest to the second end is Δ s2, and Δ s2 is 1-3mm in the normal state; and in the bending state, the bending R value of the flexible protection layer is 2.5-4 mm.
In one embodiment, the thickness of the first filler strip is equal to the depth of the second groove, and preferably, the thickness of the second filler strip is 10% -30% of the flexible protection layer.
In one embodiment, the first end of the first filler strip extends in a direction toward the second end opposite the direction in which the first end of the second filler strip extends toward the second end.
In one embodiment, along the second direction, orthographic projections of the first groove and the second groove on the flexible protection layer at least partially overlap,
in one embodiment, the overlapping range of orthographic projections of the first groove and the second groove on the flexible protection layer along the second direction is 70% -100%.
According to another aspect of the present invention, there is also provided a flexible display panel, in which the flexible protective layer is embedded; the flexible display panel includes a bending region; the first groove and the optional second groove in the flexible protection layer are arranged in the bending area, and the extending direction of the first groove is parallel to the bending axis of the bending area.
In one embodiment, the flexible protective layer is a foam layer.
The flexible protective layer and the flexible display panel have the following beneficial effects:
(1) a first groove extending along a first direction, a support bar arranged on the bottom surface of the first groove and a first filling bar covering the support bar are arranged on the first surface (back surface) of the flexible protection layer in a matched manner; the second end of the first filling strip extending along the second direction is provided with a limiting protrusion extending towards the first groove; when the flexible protective layer is bent along a bending axis parallel to the first direction, the limiting protrusions on the first filling strips are displaced relative to the supporting strips and filled between the supporting strips and the second side walls of the first grooves; the limiting structure is beneficial to reducing the extrusion force of the flexible protective layer on the first surface when the flexible protective layer is bent, so that a locking structure is formed, and the rebound tendency of the flexible protective layer in a bending area is relieved;
(2) a second groove and a second filling strip which extend along the first direction are arranged on the second surface (front surface) of the flexible protection layer in a matched mode, when the flexible protection layer is bent along a bending axis parallel to the first direction, the second groove is stretched and deformed, and the second filling strip is filled in the deformed second groove; the filling structure is beneficial to reducing the tensile force of the flexible protective layer on the second surface when the flexible protective layer is bent, and the rebound tendency of the flexible protective layer in a bending area is relieved;
(3) according to the flexible display panel, the flexible protective layer with the structure is arranged in the bending area, so that the rebound tendency of the flexible protective layer in the bending area can be effectively improved, the layering phenomenon of the flexible protective layer and the upper and lower layer structures is reduced, and the bending yield is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a flexible protection layer according to an embodiment;
FIG. 2 is an enlarged schematic view of region A in FIG. 1;
FIG. 3 is an enlarged schematic structural view of a region A of the flexible protection layer in a bending state in FIG. 1;
fig. 4 is a schematic structural diagram of a flexible protection layer according to an embodiment;
FIG. 5 is an enlarged schematic view of region B in FIG. 4;
FIG. 6 is a schematic structural diagram of a flexible protective layer according to an embodiment;
FIG. 7 is an enlarged view of the area C in FIG. 6;
FIG. 8 is an enlarged schematic structural view of a region C of the flexible protective layer in a bending state in FIG. 6;
FIG. 9 is a schematic structural view of a curved cover plate;
fig. 10 is a partial structural diagram of a flexible display panel.
Description of reference numerals: the manufacturing method comprises the following steps of 1-a flexible protection layer, 11-a first groove, 12-a support bar, 13-a first filling strip, 14-a limiting protrusion, 21-a second groove, 22-a second filling strip, 2-an OLED layer, 3-a touch layer, 4-a cover plate, 5-a flexible circuit board, 6-optical glue and 7-a protection layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The flexible display panel comprises a cover plate, an attaching layer attached to the cover plate, and a flexible protective layer for protecting the attaching layer. The adhesive layer is different according to the final display panel, for example, the adhesive layer is an OLED layer. As described in the background section, in order to increase the screen ratio, a curved cover plate is adopted in the flexible protective panel, the curved cover plate generally includes a straight area and curved areas located at two sides of the straight area, the attachment layer is attached to the straight area and the curved areas of the curved cover plate at the same time, and the flexible protective layer also provides protection for the attachment layer at the curved areas. The flexible protective layer is usually made of foam, the foam is usually rectangular and comprises a front surface and a back surface, and the front surface of the foam is attached to the attaching layer at the bent part.
Because the bending area of the curved cover plate is a curved surface and has smaller curvature, and the surface of the flexible protective layer attached to the bending area is a plane, even if the flexible protective layer (foam) is pressed by the profiling pressure head, the flexible protective layer (foam) still cannot be attached to the attachment layer of the bending area, and when the flat flexible protective layer is pressed to form a bending structure, the stress at the bending position is concentrated and has a rebound tendency, so that a layering phenomenon occurs between the protective layer and the upper-lower layer structure, and the product yield is influenced.
In order to solve at least the problem of layering of the flexible protection layer and the attached layer, research and development personnel try to set the protection layer as a split type protection layer and separately set the protection layer in the straight area and the protection layer in the bent area, and although the bending stress of the protection layer in the bent area is relieved to a certain extent by the mode, the effect of the protection layer is still to be further improved.
Therefore, the invention provides the flexible protective layer and the flexible display panel, which are used for slowly releasing the bending stress of the flexible protective layer in a bending area and improving the peeling yield of the flexible display panel applying the flexible protective layer. The specific structure of the flexible protective layer and the flexible display panel is described as follows:
example one
Fig. 1 is a schematic structural diagram of a flexible protection layer according to an embodiment; fig. 2 is an enlarged schematic structural view of a region a in fig. 1, and as shown in fig. 1-2, the flexible protection layer 1 has a first surface and a second surface which are oppositely arranged, wherein the first surface is an inner surface when the flexible protection layer is bent and is a back surface when the flexible protection layer is attached to the attachment layer. When the flexible protective layer is bent, the extrusion stress of the first surface can be increased; the second surface is an outer surface when the flexible protection layer is bent and is a front surface when the flexible protection layer is attached to the attachment layer, and when the flexible protection layer is bent, the stretching pressure of the second surface can be increased.
As shown in fig. 1 and 2, the first surface is provided with a first groove 11 extending along a first direction, wherein the first direction is a bendable bending axis direction of the flexible protection layer, and it can be understood that the first groove 11 extends along an axis direction of the bending axis, and two ends of the first groove 11 extend to two end edges of the flexible protection layer, respectively. The first groove 11 includes a side surface and a bottom surface, wherein two side surfaces oppositely disposed along a second direction are referred to as a first side surface and a second side surface, wherein the second direction is perpendicular to the first direction.
As shown in fig. 1 and 2, the supporting bars 12 on the bottom surface of the first groove 11 may be a single structure extending along the first direction, or may be several independent structures arranged along the first direction, and from the viewpoint of simplifying the process, the supporting bars 12 are preferably a single structure extending along the first direction. In one embodiment, the supporting strip 12 is integrally formed with the bottom surface of the first groove 11, so that the design not only simplifies the process, but also is beneficial to improving the binding force between the supporting strip 12 and the bottom surface of the first groove 11 for better limiting the limiting protrusion described later; in one embodiment, the supporting bar 12 may be located in a middle region of the first groove 11, that is, in the second direction, the supporting bar 12 is spaced apart from both the first side wall and the second side wall of the first groove 11, and preferably, the spacing between the supporting bar 12 and the second side wall of the first groove 11 is smaller than the spacing between the supporting bar 12 and the first side wall of the first groove 11, which makes the movement of the subsequently described limiting protrusion in the first direction more flexible; in one embodiment, as shown in fig. 4 and 5, the supporting bar 12 may be integrally formed with the first sidewall of the first groove 11. In one embodiment, the support bar 12 has a rectangular parallelepiped configuration so as to form a square retaining groove between the support bar 12 and the second side wall of the first groove.
As shown in fig. 1 and fig. 2, the first surface of the flexible protection layer 1 is further provided with a first filling strip 13; the first filling strips 13 cover the supporting bars 12, the first ends of the first filling strips 13 extending along the second direction are integrally formed with the first side walls of the first grooves 11, and the second ends of the first filling strips 13 extending along the second direction form free ends. Through the structure that adopts the first end of first packing 13 and the first lateral wall integrated into one piece of first recess 11, be favorable to promoting the cohesion between the first end of first packing 13 and the first lateral wall of first recess 11 to in order to provide sufficient holding power for first packing 13 in order to support the displacement and the deformation of the spacing arch (introduction) that is located first packing 13 second end. In one embodiment, the surface of the first filler strip 13 on the side facing away from the first recess 11 is in smooth transition with the aforementioned first surface (inner surface of the flexible protective layer). The first filling strip 13 (not including the limiting protrusion) may adopt a structure with uniform thickness, or adopt a structure in which the thickness of the first end is greater than that of the second end; when the structure that the thickness of the first end is larger than that of the second end is adopted, the thickness of the first filling strips 13 decreases progressively in the sections between the first groove 11 and the supporting strips, and the thickness of the first filling strips 13 is uniform in the sections covering the supporting strips and the second ends extending outwards further, so that the structure is favorable for further improving the bonding force between the first ends of the first filling strips 13 and the first side walls of the first groove 11.
As shown in fig. 1 and 2, a stopper protrusion 14 extending toward the first groove 13 is formed on a second end of the first filler strip 13 extending in the second direction, and the stopper protrusion 14 is integrally formed with the second end of the first filler strip 13.
The flexible protective layer provided by the invention can be bent, and the stress problem in a bent state is solved in practical application. Therefore, the flexible protective layer comprises two change forms of a normal state and a bending state. Of course, it should be noted that the bending state herein needs to achieve a certain bending degree to denature a specific area in the flexible protection layer. The following description will be made in detail with reference to the accompanying drawings, and fig. 2 is an enlarged schematic structural view of a region a in fig. 1; FIG. 3 is an enlarged schematic structural view of a region A of the flexible protection layer in a bending state in FIG. 1; as shown in fig. 2 and 3, the flexible protective layer has a normal state and a bent state, and in the normal state, the orthographic projection of the limiting protrusion 14 on the flexible protective layer is partially overlapped with the orthographic projection of the supporting strip 12 on the flexible protective layer; in the bending state, the limiting protrusions 14 are filled between the supporting bars 12 and the second side walls of the first grooves 11 (in the limiting grooves), so that a locking structure is formed to fix the bending state while relieving the extrusion stress, and the bending resilience of the flexible protection layer is reduced.
In an embodiment, in the normal state (preferably, a straight state), along the second direction, the overlapping width of the orthographic projection of the limiting protrusion on the flexible protection layer and the orthographic projection of the supporting strip on the flexible protection layer is Δ s1, the setting of Δ s1 is related to the bending ratio of the flexible protection layer, by setting the range of Δ s1, when the flexible protection layer reaches a predetermined bending ratio, the filling of the limiting protrusion 14 between the supporting strip 12 and the second side wall of the first groove 11 to form a groove-type locking structure is facilitated, and the groove-type locking structure is utilized to reduce the extrusion stress on the first surface of the flexible protection layer, resist the bending rebound of the flexible protection layer, and better maintain the bending state of the flexible protection layer. Preferably, under the normal state, the delta s1 is 1-3 mm; and in a bending state, the bending R value of the flexible protection layer is 2.5-4 mm. By setting the range of Delta s1, the better locking structure is formed, so that the bending state is fixed while the extrusion stress is reduced, and the bending resilience of the flexible protective layer is reduced.
In one embodiment, in the second direction, the width of the limiting protrusion 14 is equal to the distance between the supporting bar 12 and the second side wall of the first groove 11; through setting up this kind of structural design, more be favorable to utilizing the clamping force between support bar 12 and the second lateral wall of first recess 11 to fix spacing arch 14 to the crooked resilience of opposition flexible protection layer.
In one embodiment, the thickness of the position-limiting protrusion 14 is smaller than that of the support strip 12, preferably, the thickness of the position-limiting protrusion 14 is smaller than 1/4-3/4 of the thickness of the support strip 12, and preferably, the thickness of the support strip 12 is 1/3-1/2 of the depth of the first groove 11. Through the structural design, in the bending process of the flexible protection layer 1, the limiting protrusions 14 are filled between the supporting bars 12 and the second side walls of the first grooves 11 more easily, and the smoothness of the bending process of the flexible protection layer is improved.
In an embodiment, in a bending state, the limiting protrusion 14 is filled between the supporting bar 12 and the second side wall of the first groove 11, at this time, the first filling bar 13 is in direct contact with the supporting bar 12, and the total thickness of the supporting bar 12 and the first filling bar 13 located thereon is equal to the depth of the first groove 11.
The first surface of the flexible protective layer is provided with a first groove extending along a first direction, a supporting strip arranged on the bottom surface of the first groove and a first filling strip covering the supporting strip in a matching way; the second end of the first filling strip extending along the second direction is provided with a limiting protrusion extending towards the first groove; when the flexible protective layer is bent along a bending axis parallel to the first direction, the limiting protrusions on the first filling strips are displaced relative to the supporting strips and filled between the supporting strips and the second side walls of the first grooves; the limiting structure is beneficial to reducing the extrusion force of the flexible protection layer on the first surface when the flexible protection layer is bent, and a locking structure is formed, so that the rebound tendency of the flexible protection layer in a bending area is relieved.
Example two
FIG. 6 is a schematic structural diagram of a flexible protective layer according to an embodiment; fig. 7 is an enlarged structural view of a region C in fig. 1 according to an embodiment, as shown in fig. 6 to 7, the flexible protection layer has a first surface and a second surface that are opposite to each other, wherein the first surface is an inner surface of the flexible protection layer when the flexible protection layer is bent, and when the flexible protection layer is bent, a compressive stress of the first surface (back surface) is increased; wherein the second surface is an outer surface of the flexible protection layer when the flexible protection layer is bent, and the stretching pressure of the second surface (front surface) is increased when the flexible protection layer is bent.
As shown in fig. 6 and 7, the first surface of the flexible protection layer 1 has the same structure as the first embodiment, and the description in this embodiment is not repeated, and the structural features on the second surface of the flexible protection layer will be further described below with reference to fig. 6 and 7.
As shown in fig. 6 and 7, the second surface is provided with a second groove 21 extending along a first direction, wherein the first direction is a bendable bending axis direction of the flexible protection layer, it can be understood that the second groove 21 extends along an axial direction of the bending axis, and two ends of the second groove 21 extend to two end edges of the flexible protection layer, respectively. The second groove 21 includes a side surface and a bottom surface, wherein two side surfaces oppositely disposed along a second direction are referred to as a first side surface and a second side surface, wherein the second direction is perpendicular to the first direction.
As shown in fig. 6 and 7, a second filling bar 22 is further disposed on the second surface, a first end of the second filling bar 22 extending along the second direction is integrally formed with the first sidewall of the second groove 21, and a second end of the first filling bar 22 extending along the second direction forms a free end. Through the structure that adopts the first end of second filler strip 22 and the first lateral wall integrated into one piece of second recess 21, be favorable to promoting the cohesion between the first end of second filler strip 22 and the first lateral wall of second recess 21 to in order to provide sufficient holding power for second filler strip 22 in order to support the displacement and the deformation that are located the second end of second filler strip 22.
FIG. 7 is an enlarged view of the area C in FIG. 6; FIG. 8 is an enlarged schematic structural view of a region C of the flexible protective layer in a bending state in FIG. 6; as shown in fig. 7 and 8, in a normal state, the second filler strip 22 covers the second groove 21 and the second end of the second filler strip 22 extends to the outside of the second groove 21 along the second direction; in the bent state, the second filler stripe 22 is filled in the second groove 21.
As shown in fig. 6 and 7, in the normal state, along the second direction, the distance between the edge of the second end of the second filler strip and the side edge of the second groove closest to the second end is Δ s2, the setting of Δ s2 is related to the bending rate of the flexible protection layer, and by setting the range of Δ s2, when the flexible protection layer reaches a predetermined bending rate, the filling and matching structure of the second filler strip 22 and the second groove 21 is facilitated, and the tensile stress on the second surface of the flexible protection layer is reduced by using the filling and matching structure of the second filler strip 22 and the second groove 21, so that the bending state of the flexible protection layer is better maintained. Preferably, under the normal state, the delta s1 is 1-3 mm; and in the bending state, the bending R value of the flexible protection layer is 2.5-4 mm.
As shown in fig. 6 and 7, in one embodiment, the surface of the second filler strip 22 on the side facing away from the second groove 21 is in smooth transition with the aforementioned second surface (the outer surface of the flexible protective layer). By the structure, when the flexible protective layer is in a bending state, the structure is more stable, the surface of the other side is more smooth, and the flexible protective layer is more favorably attached to the adjacent material layer. In an embodiment, the thickness of the second filler strip 22 is equal to the depth of the second groove 21, and preferably, the thickness of the second filler strip is 10% -30% of the flexible protection layer.
As shown in fig. 6 and 7, the first end of the first packing 13 extends toward the second end in a direction opposite to the direction in which the first end of the second packing 22 extends toward the second end. Through making the setting direction of first packing strip 13 and second packing strip 22 opposite, can subdue bending stress simultaneously in the both sides of the flexible protective layer after the bending, resist crooked resilience, and then be favorable to maintaining the crooked form of flexible protective layer better. In an embodiment, the bending of the flexible protection layer is formed at one end of the flexible protection layer, the flexible protection layer is divided into a straight area and a bending area according to the form of the flexible protection layer, at this time, the first end of the first filler strip 13 is disposed near the straight area of the flexible protection layer, and the first end of the second filler strip 22 is disposed near the straight area of the flexible protection layer, so that the structure can better eliminate the bending pressure at both sides of the bending area of the flexible protection layer and resist the bending rebound.
As shown in fig. 6 and 7, along the second direction, the orthographic projections of the first groove 11 and the second groove 21 on the flexible protection layer are at least partially overlapped, and this structure is more favorable for simultaneously reducing the compressive stress and the tensile stress on both sides of the flexible protection layer, and the bending form of the flexible protection layer is favorable for being fixed by simultaneously reducing the compressive stress and the tensile stress on both sides of the flexible protection layer, so as to resist the resilience pressure of the flexible protection layer. Preferably, the overlapping range of the orthographic projections of the first groove 11 and the second groove 21 on the flexible protection layer is 70% -100%.
In this embodiment, in addition to the locking structure including the first groove, the supporting strip, the first filling strip and the limiting protrusion disposed on the first surface (back surface), the second groove and the second filling strip extending along the first direction are disposed on the second surface (front surface) of the flexible protection layer, when the flexible protection layer is bent along the bending axis parallel to the first direction, the second groove is stretched and deformed, and at this time, the second filling strip is filled in the deformed second groove; such a filling structure is advantageous for reducing the tensile force of the flexible cover layer on the second surface when bending, and for reducing the tendency of the flexible cover layer to bounce in the bending area.
EXAMPLE III
The invention also provides a flexible display panel, and the flexible display panel is internally provided with the flexible protective layer provided by the invention. The flexible display panel includes a bending region; the first groove and the optional second groove in the flexible protection layer are arranged in the bending area, and the extending direction of the first groove is parallel to the bending axis of the bending area.
The flexible display panel further comprises a cover plate and an attaching layer attached to the cover plate, and the flexible protective layer is attached to one side, far away from the cover plate, of the attaching layer. The attaching layer is different according to the final display panel, for example, the attaching layer is an OLED layer. The cover plate in the flexible display panel is a curved cover plate.
FIG. 9 is a schematic structural view of a curved cover plate; as shown in fig. 9, the (curved) cover plate 4 typically comprises a flat area and curved areas D on both sides of the flat area, the attachment layer being attached to the flat area and the curved areas of the curved cover plate.
Fig. 10 is a schematic partial structure diagram of the flexible display panel, which corresponds to the region D of the curved cover plate in fig. 9. As shown in fig. 10, the flexible display panel includes a cover plate 4, an OLED layer 2 and a touch layer 3 (the OLED layer 2 and the touch layer 3 are collectively referred to as an attachment layer) attached to the cover plate 4, and a flexible protection layer 1 attached to one side of the attachment layer away from the cover plate, wherein the OLED layer 2 and the touch layer 3, and the touch layer 3 and the cover plate 4 are bonded and fixed by an optical adhesive 6; in addition, the flexible display panel further includes a flexible circuit board 5(FPC), and an IC chip (not shown in the drawings) connected to the flexible circuit board 5(FPC), and a protective layer 7 is provided on an outer layer of the flexible circuit board 5 (FPC). Wherein the flexible protection layer 1 has the structure of the first or second embodiment. The flexible protective layer is usually made of foam, the foam is made of silica gel, and the hardness is A40-A70. The foam is generally rectangular and comprises a front surface (the second surface of the flexible protection layer) and a back surface (the first surface of the flexible protection layer), wherein the front surface is attached to the attachment layer. The Pad area 4 is a part or all of a binding area (binding Pad) and is attached to the back of the flexible protective layer.
According to the flexible display panel provided by the invention, the flexible protective layer with the structure is arranged in the bending area, so that the rebound tendency of the flexible protective layer in the bending area can be effectively improved, the layering phenomenon of the flexible protective layer and the upper and lower layer structures is reduced, and the bending yield is improved.
The invention still further provides a display device comprising any one of the flexible OLED display panels described above. Such display devices are, for example, a curved-screen mobile phone, a curved-screen PAD, a curved-screen game machine, and the like.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The flexible protective layer is characterized by comprising a first surface and a second surface which are oppositely arranged, wherein a first groove extending along a first direction, a supporting strip arranged on the bottom surface of the first groove and a first filling strip covering the supporting strip are arranged on the first surface; the first end of the first filling strip extending along the second direction is integrally formed with the first side wall of the first groove, and the second end of the first filling strip extending along the second direction is provided with a limiting protrusion extending towards the first groove;
the flexible protection layer has a normal state and a bending state, and in the normal state, the orthographic projection of the limiting protrusion on the flexible protection layer is partially overlapped with the orthographic projection of the supporting strip on the flexible protection layer; in the bent state, the limiting protrusions are filled between the supporting bars and the second side walls of the first grooves;
the first direction is perpendicular to the second direction, and a first side wall and a second side wall of the first groove are arranged oppositely.
2. The flexible protective layer according to claim 1, wherein in the normal state, along the second direction, the overlapping width of the orthographic projection of the limiting protrusion on the flexible protective layer and the orthographic projection of the supporting strip on the flexible protective layer is Δ s1, and the Δ s1 is 1-3 mm; and in the bending state, the bending R value of the flexible protection layer is 2.5-4 mm.
3. The flexible protective layer of claim 1, wherein, in the second direction, the width of the limiting protrusion is equal to the distance between the supporting bar and the second side wall of the first groove; preferably, the thickness of the limiting bulge is smaller than that of the supporting strip.
4. The flexible protective layer according to any one of claims 1 to 3, wherein a second groove extending along the first direction and a second filling strip matched with the second groove are arranged on the second surface, and a first end of the second filling strip extending along the second direction is integrally formed with a side wall of the second groove;
in the normal state, the first filling strip covers the second groove, and a second end of the second filling strip extends to the outside of the second groove along the second direction; and in the bent state, the second filling strip is filled in the second groove.
5. The flexible protective layer according to claim 4, wherein in the normal state, along the second direction, the distance between the edge of the second end of the second filler strip and the side edge of the second groove closest to the second end is Δ s2, and the Δ s2 is 1-3 mm; and in the bending state, the bending R value of the flexible protection layer is 2.5-4 mm.
6. The flexible protective layer according to claim 4, wherein the thickness of the second filler strip is equal to the depth of the second groove, preferably the thickness of the second filler strip is 10% -30% of the flexible protective layer.
7. The flexible protective layer of claim 4, wherein the first ends of the first filler strips extend in a direction toward the second ends opposite to a direction in which the first ends of the second filler strips extend toward the second ends.
8. The flexible protective layer according to claim 4, wherein, along the second direction, orthographic projections of the first groove and the second groove on the flexible protective layer at least partially overlap, and preferably, the overlapping range of the orthographic projections of the first groove and the second groove on the flexible protective layer is 70% -100%.
9. A flexible display panel having the flexible protective layer according to any one of claims 1 to 8 embedded therein; the flexible display panel includes a bending region; the first groove and the optional second groove in the flexible protection layer are arranged in the bending area, and the extending direction of the first groove is parallel to the bending axis of the bending area.
10. The flexible display panel of claim 9, wherein the flexible protective layer is a foam layer.
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