CN216287344U - Flexible display panel and display device - Google Patents

Abstract

The present disclosure provides a flexible display panel and a display device, the flexible display panel having a display area, a binding area and a bending area; the flexible display panel includes: a flexible substrate; the notacoria is equipped with the recess on, the recess is located display area and binds between the district, and the district of buckling is injectd to the edge of recess, and the district of buckling includes: a first border adjoining the display area; a second boundary adjacent to the binding region; opposite first and second edges extending from the display area to the binding area; the protective adhesive at least comprises: the first covering area is positioned on the second surface and covers the bending area; a second cover region extending from the first cover region to the first edge and covering at least a partial region of the first surface; and the third coverage area extends from the first coverage area to the second edge and covers at least partial area of the second surface. The flexible display panel and the display device can improve the fracture problem of the Pad bonding area of the flexible display panel.

Description

Flexible display panel and display device

Technical Field

The utility model relates to the technical field of display, in particular to a flexible display panel and a display device.

Background

With the development of self-luminous display technology, such as OLED (Organic Light-Emitting Diode) display panels, QLED (Quantum Dot Light Emitting Diodes) display panels, Micro LED (Micro Light Emitting Diodes) display panels, etc., due to the characteristics of good flexibility, high contrast and thinness, they have become research hotspots of people, and especially flexible display panels are increasingly applied to various fields.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a flexible display panel and a display device, which can solve the problem of fracture of a Pad Bending (Pad area Bending) area of the flexible display panel in the related art.

The technical scheme provided by the embodiment of the disclosure is as follows:

the embodiment of the present disclosure provides a flexible display panel, which includes a display area, a binding area, and a bending area located between the display area and the binding area, wherein the display area includes a first side edge, and the binding area and the bending area are located on the first side edge; the flexible display panel includes:

a flexible substrate comprising opposing first and second surfaces;

a back membrane, the back membrane set up in the first surface of flexible substrate, be equipped with the recess on the back membrane, the recess is located display area with bind between the district, the edge of recess is injectd the district of buckling, the district of buckling includes: a first border adjoining the display area; a second boundary adjacent to the binding region; and, opposite first and second edges extending from the display area to the binding area;

and, a protective adhesive, the protective adhesive at least comprising: a first cover region on the second surface and covering the bend region; a second cover region extending from the first cover region to the first edge and covering at least a partial area of the first surface; a third coverage area extending from the first coverage area to the second edge and covering at least a partial area of the second surface.

Illustratively, the length H1 of the second coverage area in the first direction has a range of values:

0＜H1≤1/2B，

and B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate.

Illustratively, the length H2 of the third coverage area in the first direction has a range of values:

0＜H2≤1/2B，

and B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate.

Illustratively, the protective adhesive further comprises:

a fourth coverage area formed by the first coverage area extending from the first boundary to a direction in which the display area is located.

Illustratively, the display area includes a second side adjacent to the first side and a third side disposed opposite to the second side;

the length L of the fourth coverage area in the first direction has a value range of:

L＝B+K₁+K₂；

wherein B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate;

0＜K₁≤K₁’，K₁' is the linear distance from the first edge to the second side edge in the first direction;

0＜K₂≤K₂’，K₂' is a straight-line distance in the first direction from the second edge to the third side edge.

Exemplarily, the flexible display panel includes a polarizer covering region for covering the polarizer;

the value range of the width E of the fourth coverage area in the second direction is as follows:

0＜E≤N；

and N is the width from the edge of the polarizer covering area to the first boundary in a second direction, and the second direction is perpendicular to the first boundary and parallel to the flexible substrate.

Illustratively, the protective adhesive further comprises:

a fifth coverage area formed by the first coverage area extending from the second boundary in a direction of the bonding zone.

Exemplarily, the bonding region is provided with a driver IC;

the value range of the width C of the fifth coverage area in the second direction is as follows:

0＜C≤M；

m is a linear distance from the second boundary to the driving IC in the second direction, and the second direction is perpendicular to the second boundary and parallel to the flexible substrate.

Illustratively, the thickness F of the film layer of the protective adhesive in the direction perpendicular to the flexible substrate has a value range of:

0＜F≤T，

and T is the sum of the film thicknesses of the polarizer and the optical adhesive layer arranged on the flexible display panel in the direction vertical to the flexible substrate.

The embodiment of the present disclosure also provides a display device including the flexible display panel as described above.

The beneficial effects brought by the embodiment of the disclosure are as follows:

the flexible display panel and the display device provided by the embodiment of the disclosure improve the covering mode of the protection adhesive (such as MCL adhesive) of the Pad bonding (Bending area) on the flexible display panel, so that the protection adhesive can well protect the whole Bending area, relieve the external force on the Bending area due to collision in the processes of production, transportation, client installation and the like, and further solve the problems of breakage and the like of the Bending area.

Drawings

Fig. 1 illustrates a front view of a flexible display panel before Pad bonding in some embodiments provided by the present disclosure;

FIG. 2 illustrates a rear view of the flexible display panel of FIG. 1 in some embodiments of the present disclosure;

FIG. 3 illustrates a rear view of the flexible display panel of FIG. 1 in accordance with further embodiments of the present disclosure;

FIG. 4 shows a side view of FIG. 1;

FIG. 5 is a schematic structural diagram of the flexible display panel in FIG. 4 during Pad bonding;

fig. 6 illustrates a bottom view of the protective paste in the flexible display panel of fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

Before the detailed description of the flexible display panel and the display device provided in the embodiments of the present disclosure, the following description of the related art is necessary:

in the related art, as the requirements of consumers on electronic products are higher and higher, the flexible OLED screen is developed at present. In the process of manufacturing a flexible screen, a Pad Bending technology has gradually replaced a COF Bending technology because the Pad Bending technology can significantly shorten the frame width of a display panel, and becomes a mainstream Bending technology. The Pad bonding technology needs to bend the Pad area to the back of the display panel, so as to achieve the purpose of reducing the width of the frame. In the Pad bonding, thinning such as removing a back film is required to be performed on a Bending region, which causes a problem that the Pad bonding is more and more fragile and is prone to fracture (Crack).

The conventional practice for protecting the bending area is: before the Pad bonding, MCL glue (Metal Cover Layer) is coated on the Bending region to protect the Bending region. However, the MCL glue can not cover the whole Bending area during coating, and Pad bonding is collided to generate Crack in the processes of production, transportation, customer installation and the like, so that the problems of poor display of a screen and the like are caused

In order to solve the above problem, the embodiment of the present disclosure provides a flexible display panel and a display device, in which a covering manner of a protection adhesive (e.g., MCL adhesive) for a Pad bonding (Bending area) on the flexible display panel is improved, so that the protection adhesive can well protect the whole Bending area, alleviate external forces on the Bending area due to collision in the processes of production, transportation, customer installation, and the like, and further solve the problems of breaking of the Bending area and the like.

As shown in fig. 1, the flexible display panel 100 provided by the embodiment of the disclosure has a display area a and a peripheral area disposed around the display area a, and the peripheral area is used for routing traces, such as a gate driving circuit.

The display area a is provided with a plurality of display pixels, for example, a plurality of display pixels distributed in an array, and the display area a is further provided with a pixel driving circuit for driving the display pixels to display.

In some embodiments, the display area a of the flexible display panel 100 includes four sides, for example, a first side a1, a second side a2 adjacent to the first side a1, a third side A3 disposed opposite to the second side a2, and a fourth side a4 opposite to the first side a 1.

The peripheral region may be further divided into a binding region S1 and a Bending region S2(Pad Bending), and the Bending region S2 is located between the binding region S1 and the display region a.

In some embodiments, the bonding region S1 and the bending region S2 are disposed at one side of the display region a, for example, at the first side a1 of the display region a. For example, taking the flexible display panel 100 as an example applied to a display device such as a mobile phone, the first side a1 may be a lower side. As shown in fig. 1 to 6, the flexible display panel 100 includes a flexible substrate, a back film, a protective adhesive 10, and the like in addition to the display area a and the peripheral area.

The flexible substrate comprises a first surface (namely a front surface) and a second surface (namely a back surface) which are opposite, the back film is arranged on the first surface of the flexible substrate, a groove is arranged on the back film and is positioned between the display area A and the binding area S1, the edge of the groove defines the bending area S2, and the broken line shown in FIG. 1 is the groove area on the back film, namely the bending area S2.

The edge of the bending region S2 can be divided into: a first border 10c adjoining the display area a; a second boundary 10d adjoining the binding region S1; and opposite first and second edges 10a and 10b extending from the display area a to the binding area S1.

It should be noted that, in some embodiments, as shown in fig. 3, the binding region S1 and the bending region S2 may be integrally connected; in other embodiments, as shown in fig. 2, the binding region S1 and the bending region S2 may also be non-integral structures. The protective adhesive 10 is mainly used to protect the bending region S2, and may be, but is not limited to, MCL (Metal Cover Layer) adhesive.

The protective adhesive 10 at least includes:

a first covering area 11, wherein the first covering area 11 is located on the second surface and covers the bending area S2;

a second covered area 12, said second covered area 12 extending from said first covered area 11 towards said first edge 10a and covering at least a partial area of said first surface;

a third covering area 13, said third covering area 13 extending from said first covering area 11 towards said second edge 10b and covering at least a partial area of said second surface.

That is, the protection paste 10 covers at least the entire front surface (first surface) of the bending region S2, and the protection paste 10 further extends from the front surface to the back surface of the bending region S2 from the first edge 10a and the second edge 10b, respectively, to wrap the first edge 10a and the second edge 10b of the bending region S2 and partially cover the back surface of the bending region S2.

Analysis on the fracture problem of the bending area S2 shows that the positions of the bending area S2, which are easily fractured by external force due to collision, are mainly the first edge 10a and the second edge 10b of the bending area S2, and therefore, by adopting the above scheme, the protective adhesive 10 covers the first edge 10a and the second edge 10b of the bending area S2, and at least a part of the protective adhesive covers the back of the bending area S2, so that the protective adhesive 10 can not only cover the bending area S2 in a whole but also can cover the edge of the bending area S2 well, thereby protecting the whole bending area S2 better, relieving the external force due to collision of the bending area S2 in the processes of production, transportation, customer installation and the like, and further solving the fracture problems of the bending area S2 and the like.

For the back coverage of the protection adhesive 10 in the bending region S2, in some embodiments of the present disclosure, as shown in fig. 1, 2 and 6, a length H1 of the second coverage area 12 in the first direction has a value range of: 0 < H1 ≦ 1/2B, where B is the length of the inflection region S2 in the first direction, which is the direction perpendicular to the first edge 10a and parallel to the substrate.

The length H2 of the third coverage area 13 in the first direction has a value range of: h2 of 0 & lt

1/2B, wherein B is the length of the inflection zone S2 in the first direction, which is the direction perpendicular to the first edge 10a and parallel to the substrate.

In the above solution, the sum of the length H1 of the second coverage area 12 in the first direction and the length H2 of the third coverage area 13 in the first direction may be less than or equal to the length B of the bending region S2 in the first direction. That is, the protection adhesive 10 may cover the whole bending region S2 or only a part of the bending region S2 on the back side of the bending region S2.

Furthermore, the length H1 of the second coverage area 12 in the first direction and the length H2 of the third coverage area 13 in the first direction may be equal or unequal. For example, H1-H2-5.0 mm.

In some exemplary embodiments, as shown in fig. 2 and 3, one side edge of the second coverage area 12 and the third coverage area may be flush with the first boundary 10c, and the other side edge is flush with the second boundary 10D, that is, the width D1 ═ D of the second coverage area 12 in the second direction, the width D1 ═ D of the third coverage area 13 in the second direction, which is perpendicular to the first boundary 10c and parallel to the flexible substrate, D is the width of the bending region S2 in the second direction, D has a value related to the value of the bending radius R of the bending region S2, D ≧ 3.14 ×, R is the bending radius of the bending region S2, and has a value related to the overall design of the flexible display panel 100, for example, R has a value of 0.25mm or 0.3 mm.

It should be noted that the above is only an example, and in other embodiments, both side edges of the second coverage area 12 and the third coverage area 13 may not be flush with the first boundary 10c and the second boundary 10 d.

In addition, as shown in fig. 2 and fig. 3, in some embodiments, the edge lines of the second coverage area 12 and the third coverage area 13 are straight edges, which is only an illustration, and in practical applications, the edge lines of the second coverage area 12 and the third coverage area 13 are not limited to straight edges, that is, the shapes of the second coverage area 12 and the third coverage area 13 are not limited, and may be a regular pattern or an irregular pattern. Furthermore, in some embodiments, as shown in fig. 1, the protective adhesive 10 further includes: a fourth coverage area 14, wherein the fourth coverage area 14 is formed by extending the first coverage area 11 from the first boundary 10c to the direction of the display area a.

In the above solution, the protection adhesive 10 covers the whole of the bending region S2 on the front surface of the flexible substrate, and at least a portion of the protection adhesive extends toward the display region a, and overlaps the lower bezel region between the display region a and the bending region S2 to further protect the bending region S2.

The length L of the fourth coverage area 14 in the first direction has a value range of: l ═ B + K₁+K₂(ii) a Wherein B is the length of the bending region S2 in the first direction, which is a direction perpendicular to the first edge 10a and parallel to the substrate; k is more than 0₁≤K₁’，K₁' is a straight distance from the first edge 10a to the edge of the second side a2 in the first direction; k is more than 0₂≤K₂’，K₂' is a straight distance from the second edge 10b to the edge of the third side a3 in the first direction.

Further, in some embodiments, the flexible display panel 100 includes a polarizer 30 covering region for covering the polarizer 30; the width E of the fourth coverage area 14 in the second direction has a value range of: e is more than 0 and less than or equal to N; where N is a width from an edge of the polarizer 30 covering the area to the first boundary 10c in a second direction, the second direction being perpendicular to the first boundary 10c and parallel to the flexible substrate.

That is, the protective adhesive 10 extends toward the display area a to be at most flush with the edge of the polarizer 30 on the flexible display panel 100 when being coated, and the specific data depends on the distance between the polarizer 30 and the bottom side of the flexible display panel 100 in the display device, for example, E is 0.45 mm.

Furthermore, in some embodiments, as shown in fig. 1, the protective adhesive 10 further includes: a fifth coverage area 15, said fifth coverage area 15 being formed by said first coverage area 11 extending from said second boundary 10d in the direction of said bonding area S1.

In the above solution, the protective adhesive 10 covers the whole of the bending region S2 on the front surface of the flexible substrate, and at least a portion of the protective adhesive extends toward the direction of the bonding region S1, and overlaps the region between the bonding region S1 and the bending region S2, so as to further better protect the bending region S2.

In some embodiments, as shown in fig. 1, the binding region S1 may be provided with the driver IC 20; the width C of the fifth coverage area 15 in the second direction has a value range of: c is more than 0 and less than or equal to M; m is a straight-line distance from the second boundary 10d to the driver IC20 in the second direction, which is perpendicular to the second boundary 10d and parallel to the flexible substrate.

That is, the protective paste 10 is applied to extend toward the bonding region S1 to be flush with the edge of the driver IC20 at most, for example, C is 0.45 mm.

It should be noted that the bonding region S1 may be provided with the driver IC20 in the embodiment shown in fig. 1, and in other embodiments, the bonding region S1 may not be provided with the driver IC, and at this time, the width C of the fifth coverage area 15 in the second direction may be limited by the driver IC. In addition, the film thickness F of the protective adhesive 10 in the direction perpendicular to the flexible substrate is related to the dispensing process, where the value range of F is 0 < E ≦ T, where T is the sum of the film thicknesses of the polarizer 30 and the optical adhesive layer 40 disposed on the flexible display panel 100 in the direction perpendicular to the flexible substrate, for example, T ═ 0.09 mm.

In addition, as shown in fig. 1, D is the width of the bending region S2 in the second direction, the value of D is related to the value of the bending radius R of the bending region S2, D ≧ 3.14 × R, R is the bending radius of the bending region S2, and the value thereof is related to the overall design of the flexible display panel 100, for example, the value of R is 0.25mm or 0.3 mm.

In combination with the above, in the flexible display panel 100 provided in the embodiment of the present disclosure, the overall coating amount a of the protective adhesive 10 is approximately equal to B (C + D) F + E F (K1+ B + K2) + D (H1+ H2) F. It should be noted that, in the flexible display panel 100 provided by the embodiment of the present disclosure, the protective adhesive 10 may be formed by a coating process, and the coated edge of the protective adhesive may be in a slope shape, for example, as shown in fig. 6, and the edge sides of the second coverage area 12 and the third coverage area 13 may be in a slope shape (as shown by a dashed box O and a dashed box P in fig. 6).

In addition, the embodiment of the present disclosure also provides a display device, which includes the flexible display panel 100 provided by the embodiment of the present disclosure. The display device can be various display devices such as a mobile phone, a tablet computer, a notebook computer, a vehicle-mounted computer and the like.

The following points need to be explained:

(1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.

(2) For purposes of clarity, the thickness of layers or regions in the figures used to describe embodiments of the present disclosure are exaggerated or reduced, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

(3) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and the scope of the present disclosure should be determined by the scope of the claims.

Claims (10)

1. A flexible display panel is provided with a display area, a binding area and a bending area located between the display area and the binding area, wherein the display area comprises a first side edge, and the binding area and the bending area are located on the first side edge; characterized in that the flexible display panel comprises:

a flexible substrate comprising opposing first and second surfaces;

the notacoria, the notacoria set up in the first surface of flexible substrate, be equipped with the recess on the notacoria, the recess is located the display area with bind between the district, the edge of recess is injectd the district of buckling, the district of buckling includes: a first border adjoining the display area; a second boundary adjacent to the binding region; and, opposite first and second edges extending from the display area to the binding area;

and, a protective adhesive, the protective adhesive at least comprising: a first cover region on the second surface and covering the bend region; a second cover region extending from the first cover region to the first edge and covering at least a partial area of the first surface; a third coverage area extending from the first coverage area to the second edge and covering at least a partial area of the second surface.

2. The flexible display panel of claim 1,

the length H1 of the second coverage area in the first direction has a value range of:

0＜H1≤1/2B，

and B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate.

3. The flexible display panel of claim 1,

the length H2 of the third coverage area in the first direction has a value range of:

0＜H2≤1/2B，

and B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate.

4. The flexible display panel of claim 1,

the protective adhesive further comprises:

a fourth coverage area formed by the first coverage area extending from the first boundary to a direction in which the display area is located.

5. The flexible display panel of claim 4,

the display area comprises a second side edge adjacent to the first side edge and a third side edge opposite to the second side edge;

the length L of the fourth coverage area in the first direction has a value range of:

L＝B+K₁+K₂；

wherein B is the length of the bending region in the first direction, and the first direction is a direction perpendicular to the first edge and parallel to the substrate;

0＜K₁≤K₁’，K₁' is the linear distance from the first edge to the second side edge in the first direction;

0＜K₂≤K₂’，K₂' is a straight-line distance in the first direction from the second edge to the third side edge.

6. The flexible display panel of claim 4,

the flexible display panel comprises a polarizer covering area for covering the polarizer;

the value range of the width E of the fourth coverage area in the second direction is as follows:

0＜E≤N；

and N is the width from the edge of the polarizer covering area to the first boundary in a second direction, and the second direction is perpendicular to the first boundary and parallel to the flexible substrate.

7. The flexible display panel of claim 1,

the protective adhesive further comprises:

a fifth coverage area formed by the first coverage area extending from the second boundary in a direction of the bonding zone.

8. The flexible display panel of claim 7,

the binding region is provided with a drive IC;

the value range of the width C of the fifth coverage area in the second direction is as follows:

0＜C≤M；

m is a linear distance from the second boundary to the driving IC in the second direction, and the second direction is perpendicular to the second boundary and parallel to the flexible substrate.

9. The flexible display panel of claim 1,

the value range of the film thickness F of the protective adhesive in the direction vertical to the flexible substrate is as follows:

0＜F≤T，

and T is the sum of the film thicknesses of the polarizer and the optical adhesive layer arranged on the flexible display panel in the direction vertical to the flexible substrate.

10. A display device characterized by comprising the flexible display panel according to any one of claims 1 to 9.

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