CN112652727A

CN112652727A - Display panel, display device and packaging method

Info

Publication number: CN112652727A
Application number: CN202011526208.9A
Authority: CN
Inventors: 高转; 刘昕昭
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-12-22
Filing date: 2020-12-22
Publication date: 2021-04-13
Anticipated expiration: 2040-12-22
Also published as: CN115623813A; CN112652727B

Abstract

The embodiment of the invention discloses a display panel, a display device and a packaging method, wherein the display panel comprises: the display device comprises a first substrate, a second substrate, a display area and a first non-display area, wherein the first substrate and the second substrate are oppositely arranged; a metal layer between the first substrate and the second substrate, including a first metal layer extending in a first direction; the orthographic projection of the first metal layer on the first substrate is positioned in the first non-display area; the first metal layer comprises a first area, a second area and a third area; the first region and the third region are positioned on two sides of the second region along the second direction; the light transmittance of the second region is greater than that of the first region and that of the third region; the laser energy of the first region, the second region and the third region on the first metal layer is relatively uniform, so that the stress caused by the uneven melting speed of the packaging adhesive is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

Description

Display panel, display device and packaging method

Technical Field

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

Background

An Organic Light Emitting Diode (OLED) Display panel has excellent performances such as low power consumption, fast response speed, ultra-thin, Light weight, wide viewing angle, and high brightness, and thus is widely used in the Display technology field, and will become a mainstream product of a Display device in the future.

At present, the OLED package can adopt a glass fusion technique, i.e. laser is used to irradiate the glass cement to bond the upper and lower substrates. In order to improve the utilization rate of laser energy, the packaging adhesive absorbs more light and achieves a better melting effect, packaging metal is usually arranged on a packaging area, a packaging metal layer can reflect laser spots, the reflected laser spots irradiate the glass adhesive again, the irradiation temperature is improved, the absorption capacity of the glass adhesive to laser is promoted, and further a more ideal melting effect is achieved. However, due to the fact that the energy distribution of the laser is uneven, the laser spots irradiate the glass cement with uneven energy, the melting speed of the glass cement in different areas is inconsistent, stress and uneven packaging exist in a packaging area, and further the glass cement is prone to cracking, packaging failure is caused, and the display effect is affected.

Disclosure of Invention

In view of the above, the present invention provides a display panel, a display device and a packaging method, which can effectively solve the problem that the packaging fails and the display is affected.

In a first aspect, the present invention provides a display panel comprising: a first substrate including a display area and a non-display area surrounding the display area; the non-display area includes a first non-display area extending in a first direction; the second substrate is arranged opposite to the first substrate; the metal layer is positioned between the first substrate and the second substrate, the orthographic projection of the metal layer on the first substrate is positioned in the non-display area, and the metal layer comprises a first metal layer extending along the first direction; the orthographic projection of the first metal layer on the first substrate is positioned in the first non-display area; the first metal layer comprises a first region, a second region and a third region; in a second direction, the first area and the third area are located on two sides of the second area, the first area is located on one side of the second area far away from the display area, and the second direction is crossed with the first direction; the light transmittance of the second region is greater than the light transmittance of the first region and the light transmittance of the third region; and the packaging glue is positioned between the first substrate and the second substrate.

In a second aspect, the present invention provides a display device comprising the display panel according to the first aspect.

In a third aspect, the invention further provides a packaging method of a display panel, which is applied to manufacturing the display panel. The method comprises the following steps: providing a display panel as described in the first aspect; providing a laser source; and sintering the packaging adhesive by using laser, wherein the laser irradiates from the packaging adhesive to the direction of the metal layer.

Compared with the prior art, the display panel and the display device provided by the invention have the following beneficial effects that: the light transmittance of the second area of the metal layer is designed to be greater than that of the first area and that of the third area, the reflection degree of different areas of the metal layer on laser energy is different, the degree of the area with high laser energy for reflecting laser is low, the degree of the area with low laser energy for reflecting laser is high, the distribution of the laser energy is further matched, finally, the laser energy received by the packaging glue of different packaging areas is uniform, the melting speed of the packaging glue of different packaging areas is relatively uniform, the stress caused by the uneven melting speed of the packaging glue is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

Drawings

FIG. 1 is a schematic diagram of a packaging process of a display panel in the prior art;

fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken in the direction B-B of FIG. 2;

fig. 4 is a schematic structural diagram of a first metal layer of a display panel according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a first metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a first metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a first metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a first metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a first metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a corner metal layer structure of a display panel according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a corner metal layer structure of another display panel according to an embodiment of the present invention;

FIG. 13 is a schematic structural diagram of another display panel according to an embodiment of the present invention;

FIG. 14 is a partial schematic view of another display panel region C provided in FIG. 10;

FIG. 15 is a schematic diagram of a display device according to an embodiment of the present invention;

fig. 16 is a schematic diagram illustrating a display panel packaging method according to an embodiment of the invention.

Detailed Description

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Also, the shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the present invention.

In order to better understand the technical solutions of the present invention, the technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict.

Please refer to fig. 1 and fig. 1, which are schematic views illustrating a packaging process of a display panel in the prior art. In the prior art, the first substrate 1 ' and the second substrate 2 ' are encapsulated by the encapsulation adhesive 4 ', and in order to improve the utilization rate of the energy of the laser 6 ', an encapsulation metal 3 ' is generally disposed on a side of the encapsulation adhesive 4 ' away from the second substrate 2 '. The first substrate 1 'and the second substrate 2' are usually made of glass, and different functional structures (not shown in the figure) such as an array structure, a light emitting structure, a touch structure, and the like may be present on the first substrate 1 'and the second substrate 2' according to the needs of the product. Other films, such as some insulating films, are disposed between the package adhesive 4 'and the package metal 3', and fig. 1 is only used to illustrate the positional relationship between the package adhesive 4 'and the package metal 3'. The laser 6 is irradiated from the package adhesive 4 'toward the package metal 3', and the package adhesive 4 'can utilize the laser energy reflected by the package metal 3'. However, the energy of the laser spot is in gaussian distribution, and the reflection degree of the packaging metal 3 ' to the laser 6 ' is the same, so that the melting speeds of the packaging glue 4 ' in different areas are inconsistent, the stress exists in the packaging glue 4 ' corresponding to the packaging area, further, the packaging glue 4 ' is easy to crack, the packaging failure is caused, and the display effect is influenced.

To solve the above problem, the present invention provides a display panel, and referring to fig. 2-3, the display panel 100 includes: a first substrate 1, the first substrate 1 including a display area AA and a non-display area NA surrounding the display area AA; the non-display area NA includes a first non-display area NA1 extending in the first direction X; a second substrate 2, the second substrate 2 being disposed opposite to the first substrate 1; the metal layer 3 is positioned between the first substrate 1 and the second substrate 2, an orthographic projection of the metal layer 3 on the first substrate 1 is positioned in the non-display area NA, and the metal layer 3 comprises a first metal layer 31 extending along the first direction X; an orthographic projection of the first metal layer 31 on the first substrate 1 is located in the first non-display area NA 1; the first metal layer 31 includes a first region 31a, a second region 31b, and a third region 31 c; in the second direction Y, the first region 31a and the third region 31c are located on both sides of the second region 31b, the first region 31a is located on a side of the second region 31b away from the display region, and the second direction Y intersects with the first direction X; the light transmittance of the second region 31b is greater than the light transmittance of the first region 31a and the light transmittance of the third region 31 c; and the packaging adhesive 4 is positioned between the first substrate 1 and the second substrate 2.

It should be explained that the first substrate 1 includes a display area AA and a non-display area NA surrounding the display area AA, and the first substrate may include various functional film layers (not shown), such as an array film layer, a light emitting film layer, etc., according to the requirements of the display panel. The display area AA is an area where a picture can be displayed and is provided with pixel units, and the non-display area NA is an area where a picture cannot be displayed and is generally used for routing or placing binding terminals, test terminals, VSR circuits and the like. The non-display area NA includes a first non-display area NA1 extending along a first direction X, where the first direction X may be a direction in which data lines extend in the display panel 100, or may also be a direction in which scan lines extend in the display panel 100.

The first metal layer 31 includes a first region 31a, a second region 31b, and a third region 31 c; in the second direction Y, the first region 31a and the third region 31c are located on both sides of the second region 31b, and the first region 31a is located on a side of the second region 31b away from the display region. It should be noted that the second direction Y may be a direction in which data lines extend in the display panel 100, or may also be a direction in which scan lines extend in the display panel 100, in the embodiment of the present invention, the second direction Y is only taken as an example to describe a direction in which scan lines extend in the display panel 100; the first region 31a is located at the outer edge of the first metal layer 31 near the display panel 100, the second region 31b is located at the middle of the first metal layer 31 along the second direction Y, and the third region 31c is located at the outer edge of the first metal layer 31 near the display area.

The light transmittance of the second region 31b is greater than the light transmittance of the first region 31a and the light transmittance of the third region 31 c. It can be understood that the first metal layer 31 is provided with a plurality of through holes, where the shapes of the through holes are not limited, and may be circular or square, and the sizes and distribution densities of the through holes in different regions are also not limited, and may be the same or different, and it is only necessary to ensure that the ratio of the total area of the through holes in the second region 31b to the total area of the second region 31b is greater than the ratio of the total area of the through holes in the first region 31a to the total area of the first region 31a, and greater than the ratio of the total area of the through holes in the third region 31c to the total area of the third region 31 c. That is, the total area of the through holes of the second region 31b is larger than that of the first region 31a, and the total area of the through holes of the second region 31b is larger than that of the third region 31c per unit area. The laser spot energy in Gaussian distribution can be matched by the arrangement, and the packaging reliability is improved. The energy of the laser spot is distributed in a state that the middle is high and the two sides are low, while the light transmittance of the middle area (the second area 31b) of the first metal layer 31 in the embodiment is high, that is, the reflection degree of the metal to the laser is low, the energy received by the packaging adhesive at the corresponding position is low, the light transmittance of the two sides (the first area 31a and the third area 31b) is low, that is, the reflection degree of the metal to the laser is high, and the energy received by the packaging adhesive at the corresponding position is high, so that the laser reflection degree of the metal is low for the area with high laser energy, and the laser reflection degree of the metal is high for the area with low laser. And then the laser energy received by the packaging adhesive 4 of the first region 31a, the second region 31b and the third region 31c on the first metal layer 31 is relatively uniform, so that the stress caused by the uneven melting speed of the packaging adhesive is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

There are various ways of achieving the light transmittance of the second region 31b of the first metal layer 31 to be greater than the light transmittance of the first region 31a and the light transmittance of the third region 31 c. The present invention will be described in the following examples.

Referring to fig. 4, in some alternative embodiments, the light transmittance of the second region 31b is 100%. It is understood that the second region 31b at this time is a central region corresponding to the highest laser energy in the packaging process. The laser energy here is sufficient to melt the encapsulation adhesive in the corresponding region, and there is no need to further irradiate the encapsulation adhesive by the metal reflection laser, so that the metal of the second region 31b of the first metal layer 31 is completely hollowed out, and the light transmittance of the second region 31b is 100%. According to the fact that the energy of the laser spot is in Gaussian distribution, the laser energy at the position corresponding to the first area 31a and the third area 31c is relatively low, the metal layer is required to reflect the laser energy to further melt the packaging adhesive at the corresponding position uniformly, therefore, a plurality of through holes can be arranged in the first area 31a and the second area 31b to reserve part of metal, and the laser energy received by the packaging adhesive at the corresponding area is relatively consistent with the laser energy received by the packaging adhesive at the second area. The stress caused by the uneven melting speed of the packaging glue can be reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

Referring to fig. 5, in some alternative embodiments, the first area 31a and the third area 31c are provided with a plurality of first through holes 311, the second area 31b is provided with a plurality of second through holes 312, the area of the first through holes 311 is equal to the area of the second through holes 312, and the distribution density of the first through holes 311 in the first area 31a and the third area 31c is less than the distribution density of the second through holes 312 in the second area 31 b. Here, whether the first through hole 311 and the second through hole 312 have the same shape or not is not limited, and may be the same or different. In some optional embodiments, the first through hole 311 and the second through hole 312 have the same shape, which is convenient for manufacturing, reduces manufacturing processes, and improves efficiency. The shapes of the first through hole 311 and the second through hole 312 are not limited, and may be any pattern according to the prior art, and fig. 5 only illustrates that the first through hole and the second through hole are both circular. It is only necessary to ensure that the areas of the first through hole 311 and the second through hole 312 are the same, and finally, the light transmittance of the second region 31b is made greater than the light transmittance of the first region 31a and the light transmittance of the third region 31 c. The arrangement can realize that the light transmittance of the second area 31b in the first metal layer 31 is greater than that of the first area 31a and that of the third area 31c, so that the laser energy received by the packaging glue of the first area 31a, the second area 31b and the third area 31c on the first metal layer 31 is relatively uniform, the stress caused by the uneven melting speed of the packaging glue is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

Referring to fig. 2 and fig. 6, in some alternative embodiments, the first area 31a and the third area 31c are provided with a plurality of first through holes 311, the second area 31b is provided with a plurality of second through holes 312, and the area of the first through holes 311 is smaller than that of the second through holes 312. It should be noted that, here, the distribution state of the second through holes 312 in the second area 31b is not limited, and may be a scattered distribution, or an ordered staggered distribution, or a linear distribution, and it is only necessary to ensure that the distribution density of the second through holes 312 in the second area 31b is the same as the distribution density of the first through holes 311 in the first area 31a and the distribution density of the first through holes 311 in the third area 31c, and finally, the light transmittance of the second area 31b is made larger than the light transmittance of the first area 31a and the light transmittance of the third area 31c, and fig. 6 only illustrates that the first through holes 311 and the second through holes 312 are linearly arranged along the first direction X. The light transmittance of the second area 31b in the first metal layer 31 is greater than that of the first area 31a and that of the third area 31c, so that the laser energy received by the packaging glue of the first area 31a, the second area 31b and the third area 31c on the first metal layer 31 is relatively uniform, the stress caused by the uneven melting speed of the packaging glue is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured.

Referring to fig. 7, in some alternative embodiments, the area of the first through hole 311 is smaller than that of the second through hole 312, and the centers of the plurality of second through holes 312 arranged along the first direction X are on a first virtual center line L1 extending along the first direction X; the area of the first via hole 311 positioned in the first region 31a gradually decreases in a direction in which the display area AA points to the first non-display area NA 1; the area of the first through hole 311 located in the third region 31c gradually increases.

It is understood that the first virtual center line L1 is a connection line of the centers of the second vias 312, and is not a line actually existing on the first metal layer 31, where the center of the second via 312 is a geometric center thereof. The direction in which the display area AA points to the first non-display area NA1 is also the second direction Y. In the process of packaging the display panel, the path of the laser above the first non-display area NA1 is a straight line, so that the second through holes are linearly distributed and can be matched with the path of the laser to move, the position with high laser energy corresponds to the metal layer 3 with a large through hole area as much as possible, the reflection of the laser is reduced, and the packaging is uniform. Meanwhile, the distribution of the laser energy is in a state that the energy is gradually reduced from the center to the two sides, so that the area of the second through hole 312 in the middle area (the second area 31b) of the first metal layer 31 is larger than the area of the first through hole 311 in the two side areas (the first area 31a and the third area 31c) and is matched with the laser middle energy; meanwhile, in the direction in which the display area AA points to the first non-display area NA1, the area of the first through hole 311 located in the first region 31a gradually decreases, the area of the first through hole 311 located in the third region 31c gradually increases, that is, the light transmittance from the middle region to the two side regions along the first metal layer 31 gradually decreases, the laser reflection intensity gradually increases, and the laser reflection intensity is matched with the state in which the energy from the center to the two sides of the laser energy gradually decreases, so that the energy received by the packaging adhesive in the whole region of the first metal layer 31 is uniform. By the design, the stress risk caused by uneven melting speed of the packaging adhesive can be reduced, the packaging effect of the display panel is improved, and the display reliability is ensured.

Referring to fig. 8, in some alternative embodiments, a center line of the first metal layer 31 extending along the first direction X is a first center line L2, and the first virtual center line L1 is located on a side of the first center line L2 away from the display area AA.

It is understood that the first metal layer 31 is an axisymmetric pattern having a plurality of symmetry axes, where the first center line L2 is a symmetry axis of the first metal layer 31 extending along the first direction X. The connecting line L1 where the centers of the plurality of second through holes 312 are located on one side of the first central line L2, which is located on the first metal layer 31 and extends along the first direction X, away from the display area AA, so that the path of the laser light can be shifted to the side away from the display area during the packaging process of the display panel 100, so that the area with high laser energy is away from the display area AA, thereby preventing the devices in the display area AA from being burned by the laser light, and further ensuring the reliability of the display.

Referring to fig. 2 and 9, in some alternative embodiments, the first metal layer 31 includes a plurality of main body portions 31A extending along the first direction X and a plurality of connecting portions 31B extending along the second direction Y, and the connecting portions 31B connect two adjacent main body portions 31A; two connection portions 31B adjacent in the second direction Y have a gap S in the first direction X. The light transmittance of the second region 31b is greater than the light transmittance of the first region 31a and the light transmittance of the third region 31 c.

It is understood that the main body portion 31A and the connecting portion 31B are integrally formed, and are represented by the same filling pattern through one process. In the second direction Y, there is a gap S between at least two connecting portions 31B, and it should be noted here that there is a gap S between two adjacent connecting portions 31B that is not equal to zero, and the gaps S between two adjacent connecting portions 32 may be equal or different and are not limited herein.

It should be noted that the display panel 100 is prone to generate static electricity during the manufacturing process, such as cutting, so that static electricity is accumulated in the display panel. Considering that the path of the static electricity introduced into the display panel 100 is from the non-display area NA to the display area AA, and the metal layer 3 is located in the non-display area NA and disposed around the display area AA, the static electricity is easily introduced into the display panel through the encapsulating metal, so that the static electricity risk of the display panel is higher, and the display effect is further affected. In the embodiment of the present invention, the main portion 31A and the connection portion 32B of the first metal layer 31 are disposed, and the gap S exists between two adjacent connection portions 31B, so that a path of static electricity entering the display area AA through the first non-display area NA1 can be extended, so that the static electricity is dissipated on the first metal layer, a risk that static electricity accumulated in the display panel enters the display area is reduced, and reliability of a display effect is enhanced. Meanwhile, the light transmittance of the second region 31b is greater than the light transmittance of the first region 31a and the light transmittance of the third region 31c, so that the laser energy distribution of laser in the packaging process can be further matched, and the packaging reliability is improved. The different design of the light transmittance of the second region 31B and the light transmittance of the first and

third regions

31A and 31c can be controlled by adjusting the width of the different-region body portions 31A, the spacing between the adjacent body portions 31A, and the number of the connecting portions 31B. It should be noted that the entire metal layer 3 may be designed similarly to the first metal layer 31, and only the first metal layer 31 is described here as an example.

With continued reference to fig. 9, in some alternative embodiments, the width of the main body portion 31A in the second direction Y is W1, the width of the connecting portion 31B in the first direction X is W2, and W1 is W2; the pitch between the adjacent two main body portions 31A of the second region 31ba is larger than the pitch between the adjacent two main body portions 31A of the first region 31A and the third region 31 c.

It is understood that, in the present embodiment, the interval h2 between the adjacent two main body portions 31A of the second region 31B is greater than the interval h1 between the adjacent two main body portions 31A of the first region 31A and the interval h3 between the adjacent two main body portions 31A of the third region 31c, and the width W1 of the main body portions 31A in the second direction Y and the width W2 of the connecting portion 31B in the first direction X are equal. The light transmittance of the second region 31b is larger than that of the first region 31A and that of the third region 31c by controlling the distance between the adjacent main body parts 31A in different regions, so that the stress risk caused by uneven melting speed of the packaging adhesive can be reduced, the packaging effect of the display panel is improved, and the display reliability is ensured.

It should be further explained that the width W1 of the main body 31A along the second direction Y and the width W2 of the connecting portion 31B along the first direction X are the width of the path of the static electricity during the transmission process, and the width of the path further determines the magnitude of the resistance, and the static electricity is prone to be damaged at the sudden change position of the resistance during the transmission process in the display panel. In the embodiment of the present invention, the width W1 of the main body 31A along the second direction Y and the width W2 of the connecting portion 31B along the first direction X are equal to each other, so that the resistance of static electricity is uniform from the main body 31A to the connecting portion 31B during the transmission process, and the risk of package failure caused by electrostatic damage to the first metal layer 31 is further reduced.

In summary, in this embodiment, not only the reliability of the package can be ensured, but also the path of static electricity entering the display area from the non-display area can be prolonged, and meanwhile, the resistance in the first metal layer 31 can be uniform, thereby effectively preventing the pad layer metal from being damaged by static electricity.

Referring to fig. 10-11, in some alternative embodiments, the non-display area NA of the display panel 100 further includes a second non-display area NA2 extending along the second direction Y, and a corner non-display area NA3 connecting the first non-display area NA1 and the second non-display area NA2, wherein the corner non-display area NA3 includes a connecting edge 330, and the connecting edge 330 is arc-shaped; the metal layer 3 further includes a second metal layer 32 extending along the second direction Y and a corner metal layer 33 connecting the first metal layer 31 and the second metal layer 32, and an orthographic projection of the corner metal layer 33 on the first substrate (not shown in the figure) is located in the corner non-display area NA 3; the corner metal layer 33 includes a fourth region 33a and a fifth region 33b, and the fourth region 33a is located on one side of the fifth region 33b close to the display area AA; the light transmittance of the fourth region 33a is greater than that of the fifth region 33 b.

It is understood that the display panel 100 may have a rounded rectangle shape as shown in fig. 10, in which case, the adjacent two sides are connected by an arc-shaped side. The non-display area NA corresponding to the rounded rectangle display panel 100 is naturally also a rounded rectangle, and the path of the laser in the process of packaging the display panel is also a rounded rectangle, so the metal layer 3 playing a role of reflecting laser energy is also arranged around the display area AA in a rounded rectangle, and includes a second metal layer 32 extending along the first metal layer 31 extending along the first direction X and extending along the second direction Y, and a corner metal layer 33 connecting the first metal layer 31 and the second metal layer 32. When the laser passes through the corner non-display area NA3, the path of the corner non-display area NA3 on the side close to the display area AA is shorter than the path on the side away from the display area AA, but the laser spot stays for the same time on the entire corner non-display area NA3, and the laser energy received per unit length on the side with the shorter path is higher than the laser energy received per unit length on the side with the longer path, so that the laser energy received on the side close to the display area AA is higher than the laser energy received on the side away from the display area AA. The inconsistent laser energy can lead to inconsistent melting speed of the packaging adhesive, so that the packaging adhesive is easy to crack due to stress, and the packaging failure is caused. In order to avoid the above problem, the present embodiment specially designs the corner metal layer 33 such that the light transmittance of the fourth area 33a close to the display area AA is greater than that of the fifth area 33b far from the display area AA. The reflection of the corner metal layer 33 of the fourth area 33a to the laser can be reduced, and the reflection of the corner metal layer 33 of the fifth area 33b to the laser is enhanced, so that the laser energy received by the whole corresponding packaging glue of the corner metal layer 33 is relatively uniform, the stress risk caused by the uneven melting speed of the packaging glue is reduced, the packaging effect of the display panel is improved, and the reliability of display is ensured. Meanwhile, the reflection of the corner metal layer 33 of the fourth area 33a close to the display area AA to the laser is reduced, so that the device of the display area AA can be further protected, and the display reliability is further ensured.

For the design that the light transmittance of the fourth region 33a is greater than that of the fifth region 33b, in some alternative embodiments, please refer to fig. 11, a plurality of third through holes 331 with the same area are disposed in the fourth region 33a, and a plurality of fourth through holes 332 with the same area are disposed in the fifth region; the area of the third through hole 331 is larger than that of the fourth through hole 332.

It can be understood that the shape of the third through hole 331 and the shape of the fourth through hole 332 may be the same or different, and the shapes of the first through hole 331 and the second through hole 332 are not limited, and may be circular, square, star, or the like. The design can ensure that the process is relatively simple and the production cost is reduced.

Referring to fig. 10 and 12, in some alternative embodiments, the third through hole 331 and the fourth through hole 332 have different shapes, the fourth through hole 332 is a closed figure, and the third through hole 331 is a non-closed figure opened toward the display area AA.

It is understood that the pattern of the fourth through-hole 332 is not limited, and fig. 12 illustrates only a closed pattern in which the fourth through-hole 332 is circular. The third through hole 331 is a non-closed wave-shaped through hole, and the opening faces the display area, so that the light transmittance of the fourth area can be higher than that of the fifth area, and the reliability of packaging is ensured. Meanwhile, the transmission path of static electricity can be prolonged, and the ESD capability of the display panel is enhanced. Further, the design of the third through hole 331 near the display area can also avoid the problem that the display is affected by burning of the device in the display area.

Referring to fig. 13, in some alternative embodiments, the non-display area NA further includes a step area NA4, and the step area NA4 and the second non-display area NA2 are respectively located at two sides of the display area AA along the first direction X; the step area NA4 includes first metal lines 5 and second metal lines 6, at least one second metal line 6 is located between adjacent first metal lines 5, the first metal lines 5 transmit display signals to the display area AA, and the second metal lines 6 float.

It can be understood that the step area NA4, the first non-display area NA1, the second non-display area NA2 and the corner display area NA3 surround the display area AA, and the step area NA4 is not provided with an encapsulation metal, i.e., the metal layer in this embodiment, and the first metal line 5 and the second metal line 6 are used as the encapsulation metal to reflect the laser light, so that the usage amount of the metal layer 31 can be reduced, and the material cost can be reduced. The first metal line 5 transmits signals to the display area AA, and may be a connection line for connecting a test circuit, a fanout line for data lines, and other connection lines for connecting to a bonding terminal (or a driving chip). One or more second metal lines 6 are positioned between the first metal lines 5 in a floating state. The setting of second metal wire 6 can adjust the luminousness in step district for the luminousness in step district and laser energy phase-match make encapsulation glue melting speed even, improve the reliability of encapsulation.

Referring to fig. 14, fig. 14 is a partial schematic view of a region C in another display panel provided in fig. 10, in some alternative embodiments, the display panel 100 further includes power signal lines 8, and the metal layer 3 is electrically connected to the power signal lines 8. It should be explained that the metal layer 3 can be disposed to reflect laser light, but at the same time, because the position of the metal layer 3 is located in the non-display area, and the material is metal, the static electricity generated during the manufacturing process of the display panel can be easily transmitted to the display area due to the position and the material specificity. In this embodiment, the metal layer 3 and the power signal line 8 are electrically connected by the bridge portion 7, where the power signal line 8 may be PVEE, and a fixed potential is connected, so that the metal layer 3 and the power signal line 8 can better disperse static electricity after being electrically connected, thereby preventing static electricity from accumulating in the display panel 100 and affecting the display effect. It is understood that, according to the product requirement, the bridge portion 7 may be multiple, and the positions of the bridge portion 7 may be disposed at four corners of the display panel, or may be disposed at the step area, which is not limited herein.

Referring to fig. 15, an embodiment of the invention further provides a display device 200 including any one of the display panels 100 in the above embodiments. Although fig. 15 illustrates a mobile phone, the display device is not limited to a mobile phone, and may be a tablet computer, a computer monitor, a display applied to a smart wearable device, or a display applied to a vehicle such as an automobile. The display device is considered to fall within the scope of protection of the present application as long as the display device includes the display panel included in the display device disclosed in the present application.

The invention also provides a packaging method of the display panel, which comprises the steps of providing the display panel, providing a laser source, sintering the packaging adhesive by utilizing laser, and irradiating the laser from the packaging adhesive to the metal layer. And on a plane perpendicular to the metal layer, the energy and the speed of the laser are unchanged in the process that the light spot of the laser is overlapped with the packaging adhesive. In the existing packaging technology, packaging metal at special positions (such as corners) of a special-shaped product is not specially designed, and the power and the speed of laser are required to be continuously adjusted according to different positions. But the packaging adhesive is easy to crack at the change of the laser speed and the power, so that the packaging fails. The packaging method provided by the invention does not need to adjust the speed and power of the laser, but utilizes the display panel to match the same laser path and speed through different designs of the transmittance of the metal layers at different positions, so that the packaging uniformity can be improved, the problem of packaging glue cracks caused by the need of adjusting the laser energy and speed at special positions is solved, and the packaging reliability of the display panel is improved.

Referring to fig. 16, in order to ensure the reliability of the package of the display panel, during the packaging process, an overlapping region exists between the starting point S of the laser and the ending point F of the laser on the metal layer, and the metal layer in the overlapping region is a hollow 34. It can be understood that, in the packaging process, due to process errors, it cannot be ensured that the starting point and the end point of the laser are exactly coincident, and in order to ensure that the laser path can completely cover the packaging area of the whole display panel, the end point F of the laser is located in front of the starting point S along the path direction of laser scanning, so that there is an overlapping area between the starting point S of the laser and the end point F of the laser on the metal layer. It can be understood that after two scans of the laser in the overlapping region, the package glue in the corresponding region receives a higher laser energy than the region without the laser overlapping, which may cause uneven stress on the package glue to cause cracks, thereby causing package failure. In the embodiment of the invention, the metal layer in the overlapping area is set to be the hollow part 34, so that the reflection of the metal in the overlapping area to the laser can be reduced, and the energy received by the packaging adhesive in the overlapping area and other areas can be relatively uniform. And then reduce the stress risk that causes because encapsulation glue melting speed is uneven, improve display panel's encapsulation effect, guarantee the reliability of demonstration.

Compared with the prior art, the display panel, the display device and the packaging method provided by the invention have the following beneficial effects that: on the one hand, the luminousness through the second area to the metal level is greater than the luminousness of first area and the special design of the luminousness of third area, make the different areas of metal level different to the reflection degree of laser energy, the degree of the regional reflection laser that laser energy is high is low, the degree of the regional reflection laser that laser energy is low is high, further match the distribution of laser energy, finally make the laser energy homogeneous that different encapsulation area encapsulation joints received, the melting speed of different encapsulation district encapsulation glues is relatively even like this, and then reduced because the stress that the encapsulation glues speed of melting and arouse, display panel's encapsulation effect has been improved, the reliability of demonstration has been guaranteed. On the other hand, the design of the main body part and the connecting part in the metal layer can realize the purpose of prolonging the path of static electricity entering the display area and enhancing the ESD capability of the display panel.

The display panel, the display device and the packaging method provided by the embodiment of the invention are described in detail, and the principle and the embodiment of the invention are explained by applying specific examples, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A display panel, comprising:

a first substrate including a display area and a non-display area surrounding the display area;

the non-display area includes a first non-display area extending in a first direction;

the second substrate is arranged opposite to the first substrate;

the metal layer is positioned between the first substrate and the second substrate, the orthographic projection of the metal layer on the first substrate is positioned in the non-display area, and the metal layer comprises a first metal layer extending along the first direction;

the orthographic projection of the first metal layer on the first substrate is positioned in the first non-display area;

the first metal layer comprises a first region, a second region and a third region; in a second direction, the first area and the third area are located on two sides of the second area, the first area is located on one side of the second area far away from the display area, and the second direction is crossed with the first direction;

the light transmittance of the second region is greater than the light transmittance of the first region and the light transmittance of the third region;

and the packaging glue is positioned between the first substrate and the second substrate.

2. The display panel according to claim 1, wherein the first region and the third region are provided with a plurality of first through holes, wherein the second region is provided with a plurality of second through holes, and wherein an area of the first through holes is smaller than an area of the second through holes.

3. The display panel according to claim 2, wherein centers of a plurality of the second through holes arranged in the first direction are on a first virtual center line extending in the first direction;

in the direction of the display area pointing to the first non-display area, the area of the first through hole in the first area is gradually reduced; the area of the first through hole in the third region is gradually increased.

4. The display panel according to claim 3, wherein a center line of the first metal layer extending along the first direction is a first center line, and the first virtual center line is located on a side of the first center line away from the display area.

5. The display panel according to claim 2, wherein the first through hole and the second through hole are the same in shape.

6. The display panel according to claim 1, wherein the first metal layer includes a plurality of main body portions extending in a first direction and a plurality of connecting portions extending in a second direction, the connecting portions connecting two adjacent main body portions; two of the connection portions adjacent in the second direction have a gap in the first direction.

7. The display panel according to claim 6,

a width of the main body portion in the second direction is W1, a width of the connection portion in the first direction is W2, and W1 is W2;

the distance between two adjacent main body portions of the second region is larger than the distance between two adjacent main body portions of the first region and the third region.

8. The display panel according to claim 1, wherein the second region has a light transmittance of 100%.

9. The display panel according to claim 1, wherein the non-display region further comprises a second non-display region extending in the second direction, and a corner non-display region connecting the first non-display region and the second non-display region, the corner non-display region comprising a connecting edge, the connecting edge having an arc shape;

the metal layers further comprise a second metal layer extending along the second direction and a corner metal layer connecting the first metal layer and the second metal layer, and an orthographic projection of the corner metal layer on the first substrate is located in the corner non-display area;

the corner metal layer comprises a fourth area and a fifth area, and the fourth area is positioned on one side of the fifth area close to the display area;

the light transmittance of the fourth region is greater than that of the fifth region.

10. The display panel according to claim 9, wherein the fourth region is provided with a plurality of third through holes having an equal area, and the fifth region is provided with a plurality of fourth through holes having an equal area; the area of the third through hole is larger than that of the fourth through hole.

11. The display panel according to claim 10, wherein the third through hole is a non-closed figure opening toward the display area.

12. The display panel according to claim 9, wherein the non-display region further comprises a step region, and the step region and the second non-display region are respectively located on both sides of the display region in the first direction;

the step area comprises first metal lines and second metal lines, at least one second metal line is located between the adjacent first metal lines, the first metal lines transmit display signals to the display area, and the second metal lines are floating.

13. The display panel according to claim 1, further comprising a power supply signal line, the metal layer being electrically connected to the power supply signal line.

14. A display device characterized by comprising the display panel according to any one of claims 1 to 13.

15. A method for packaging a display panel is characterized in that,

providing a display panel according to any one of claims 1-13;

providing a laser source;

and sintering the packaging adhesive by using laser, wherein the laser irradiates from the packaging adhesive to the direction of the metal layer.

16. The packaging method according to claim 15, wherein the energy and speed of the laser are unchanged in a packaging process in which the spot of the laser overlaps with the packaging adhesive on a plane perpendicular to the metal layer.

17. The packaging method according to claim 16, wherein an overlapping region exists between the starting point of the laser and the ending point of the laser on the metal layer during the packaging process, and the metal layer in the overlapping region is hollowed out.