Packaging method of display panel, display panel and display device

A packaging method of a display panel, a display panel and a display device are provided. The packaging method includes: providing a first substrate; providing an adhesive with a magnetic material distributed therein; applying the adhesive to a surface of the first substrate to form a first adhesive layer having a first pattern; providing a magnetic field to drive the magnetic material to mobilize the adhesive on the surface of the first substrate, so as to transform the first adhesive layer having the first pattern into a second adhesive layer having a second pattern, wherein, an orthogonal projection of the first adhesive layer having the first pattern on the first substrate is different from an orthogonal projection of the second adhesive layer having the second pattern on the first substrate; and bonding a second substrate onto the adhesive layer having the second pattern.

The present application claims priority of Chinese Patent Application No. 201710641213.6 filed on Jul. 31, 2017, the disclosure of which is incorporated herein by reference in its entirety as part of the present application.

TECHNICAL FIELD

Embodiments of the present disclosure relate to a packaging method of a display panel, a display panel, and a display device.

BACKGROUND

A function of packaging an Organic Light-Emitting Diode (OLED) display panel is blocking water and oxygen, which is implemented by combining a frame sealant with a filling adhesive inside the panel.

SUMMARY

An embodiment of the present disclosure provides a packaging method of a display panel, including: providing a first substrate; providing an adhesive with a magnetic material distributed therein; applying the adhesive to a surface of the first substrate to form a first adhesive layer having a first pattern; providing a magnetic field to drive the magnetic material to mobilize the adhesive on the surface of the first substrate, so as to transform the first adhesive layer having the first pattern into a second adhesive layer having a second pattern, wherein, an orthogonal projection of the first adhesive layer having the first pattern on the first substrate is different from an orthogonal projection of the second adhesive layer having the second pattern on the first substrate; and bonding a second substrate onto the adhesive layer having the second pattern.

In an example, an orthogonal projection of the first adhesive layer having the first pattern on the first substrate is smaller than an orthogonal projection of the second adhesive layer having the second pattern on the first substrate.

In an example, the display panel has a display region, and an orthogonal projection of the second adhesive layer having the second pattern on the first substrate at least partially overlaps with an orthogonal projection of the display region on the first substrate.

In an example, the providing a first substrate includes providing the first substrate to a carrying platform, and the carrying platform is configured to provide the magnetic field.

In an example, the first adhesive layer having the first pattern includes a plurality of separated portions.

In an example, the second adhesive layer having the second pattern is continuous.

In an example, the providing an adhesive doped with a magnetic material includes: mixing the adhesive and the magnetic material in a filling machine; stirring the adhesive and the magnetic material mixed in a defoaming machine, so that the magnetic material is uniformly distributed in the filling adhesive.

In an example, the first substrate includes a glass plate or a package cover plate on which an electroluminescent element is formed.

In an example, the magnetic material is transparent.

In an example, as to the first adhesive layer having the first pattern, a distance between each adjacent two separated portions is in a range of 8 mm to 12 mm, and a mass of each of the separated portions is in a range of 0.5 mg to 1.0 mg.

Another embodiment of the present disclosure provides a display panel, including: a first substrate, a second substrate and an adhesive layer located between the first substrate and the second substrate, wherein, a magnetic material is distributed in the adhesive layer.

In an example, the display panel has a display region, and an orthogonal projection of the adhesive layer on the first substrate at least partially overlaps with an orthogonal projection of the display region on the first substrate.

In an example, the display panel is an electroluminescent display panel.

In an example, the magnetic material is transparent.

In an example, the magnetic material is nano γ-Fe2O3.

In an example, a distance between the first substrate and the second substrate is in a range of 5 μm to 6 μm.

Yet another embodiment of the present disclosure provides a display device, including the display panel according to claim11.

DETAILED DESCRIPTION

In a packaging mode, a filling adhesive is distributed on glass in dots or in lines. Disadvantages of such packaging mode are: it is difficult to uniformly distribute the respective dots or the respective lines, and it is necessary to strictly control dripping precision and a dripping quantity of the filling adhesive. The filling adhesive has poor natural fluidity, and needs a press-fitting process to diffuse; As a result, a phenomenon of a lattice display unevenness will often occur at a dot-to-dot overlapping position, which affects a lighting effect of a panel.

FIG. 1shows a flow chart of steps of a packaging method of a display panel provided by an embodiment of the present disclosure. The method includes:

Step101: doping a magnetic material in filling adhesive to form a mixed adhesive.

In this embodiment, the filling adhesive is an adhesive commonly used in packaging of an OLED display panel, and filled between a first substrate and a second substrate. It can be Ultraviolet (UV) adhesive, i.e., an adhesive cured by UV to be used in a later stage; it may also be other adhesives, which will not be specifically limited in the embodiment of the present disclosure. A magnetic material C is doped in a filling adhesive300to form a mixed adhesive301. For example, the filling adhesive and the magnetic material are mixed in a filling machine; and the filling adhesive and the magnetic material that are mixed are stirred in a defoaming machine, so that the magnetic material is uniformly distributed in the filling adhesive, to form the mixed adhesive301. For example, the magnetic material is a transparent magnetic material. The magnetic material is, for example, granular.

Step102: fixing the first substrate onto a carrying platform.

In this embodiment, the first substrate can be fixed onto the carrying platform by vacuum adsorption, and the first substrate can also be fixed onto the carrying platform in other manners, which will not be specifically limited in the embodiment of the present disclosure. For example, the carrying platform201can be a component in an electromagnetic system, and the electromagnetic system may further include a plurality of electromagnetic units202uniformly distributed on the carrying platform201, and vacuum adsorption pores203, with reference to the electromagnetic system shown inFIG. 2. The carrying platform201can be a glass carrying platform, which will not be specifically limited in the embodiment of the present disclosure. The electromagnetic unit202can generate an electromagnetic field after being energized, and the electromagnetic field controls intensity, direction and the like of the electromagnetic field through a structure in the electromagnetic unit202.

For example, the first substrate can be a glass plate or a package cover plate on which an electroluminescent element is formed.

Step103: dispensing the mixed adhesive on a surface of the first substrate to form a first adhesive layer having a first pattern.

In this embodiment, after the first substrate302is fixed onto the carrying platform201, the mixed adhesive301is dispensed on the surface of the first substrate302, to form a first adhesive layer L1having a first pattern on the first substrate302, as shown inFIG. 3. The first adhesive layer L1having the first pattern includes a plurality of separated portions M, for example, a distance between each adjacent two separated portions M on the surface of the first substrate is 8 mm to 12 mm, and a mass of each of the separated portions M is 0.5 mg to 1.0 mg.

Step104: forming an electromagnetic field on a surface of the carrying platform, so that the magnetic material is diffused under an action of the electromagnetic field, and the mixed adhesive is uniformly distributed on the surface of the first substrate along with diffusion of the magnetic material, so as to form a second adhesive layer having a second pattern.

In this embodiment, the electromagnetic system can be turned on, so that respective electromagnetic units202of the electromagnetic system form an electromagnetic field on the surface of the carrying platform201. The magnetic material in the mixed adhesive301is diffused under the action of the electromagnetic field, and the respective separated portions M of the first adhesive layer L1of the mixed adhesive301are diffused to the periphery with diffusion of the magnetic material, with reference to an arrow direction shown inFIG. 4. The respective separated portions of the first adhesive layer L1are diffused to the periphery, and finally, the mixed adhesive301is uniformly distributed on the surface of the first substrate302to form a second adhesive layer L2having a second pattern of the mixed adhesive, with reference to a schematic diagram of uniform distribution of the mixed adhesive shown inFIG. 5. The second adhesive layer L2having the second pattern is continuous.

With reference toFIG. 3toFIG. 5, an orthogonal projection of the first adhesive layer L1having the first pattern on the first substrate302is smaller than an orthogonal projection of the second adhesive layer L2having the second pattern on the first substrate302.

The display panel has a display region DR. With reference toFIG. 5, the orthogonal projection of the second adhesive layer L2having the second pattern on the first substrate302completely covers an orthogonal projection of the display region DR (as shown by a dotted-line box) on the first substrate302. In another embodiment, an orthogonal projection of the second adhesive layer L2having the second pattern on the first substrate302can partially overlap with an orthogonal projection of the display region DR on the first substrate302.

In the embodiment of the present disclosure, an intensity of the electromagnetic field can be adjusted by current of the electromagnetic unit202. For example, the thickness deviation of the second adhesive layer L2of the mixed adhesive having the second pattern≤0.5%

Step105: pressing and bonding the second substrate on the second adhesive layer having the second pattern.

In this embodiment, after the mixed adhesive301is uniformly distributed on the surface of the first substrate302, the second substrate303and the first substrate302can be pressed and bonded together with a Vacuum Align System (VAS).

In summary, in the embodiment of the present disclosure, the magnetic material is doped in the filling adhesive to form the mixed adhesive; the first substrate is fixed onto the carrying platform; the mixed adhesive is dispensed on the surface of the first substrate; the electromagnetic field is formed on the surface of the carrying platform; the magnetic material is diffused under the action of the electromagnetic field, the mixed adhesive is uniformly distributed on the surface of the first substrate along with the diffusion of the magnetic material; and finally, the second substrate is pressed and bonded on the mixed adhesive. In the embodiment of the present disclosure, it is only necessary to consider a total dripping quantity of the mixed adhesive, without taking into account the dripping precision, and meanwhile, it is not necessary to align, but only necessary to drip the mixed adhesive onto the first substrate; since uniform distribution of the mixed adhesive is implemented before pressing and bonding, a gap between the first substrate and the second substrate after pressing and bonding is more uniform, which avoids occurrence of the phenomenon of uneven display, improves a packaging effect, and simplifies processing adjustment.

With reference toFIG. 6, a display panel DP provided by an embodiment of the present disclosure is shown. The display panel is packaged by using the method as described in the above described embodiment, and the display panel includes a first substrate302, a second substrate303, and a layer of mixed adhesive301uniformly distributed between the first substrate302and the second substrate303;

Wherein, the mixed adhesive301is a mixture of a filling adhesive and a magnetic material.

In this embodiment, the display panel is packaged by using the method as described in the above embodiment, and therefore, the mixed adhesive301filled between the first substrate302and the second substrate303is a mixture of the filling adhesive and the magnetic material. The magnetic material can be diffused under an action of the electromagnetic field, so that the mixed adhesive301is uniformly distributed on the first substrate302.

For example, the display panel is an OLED display panel.

For example, the magnetic material is nano γ-Fe2O3.

For example, a distance between the first substrate and the second substrate is 5 μm to 6 μm.

In summary, in the embodiment of the present disclosure, the display panel includes the first substrate, the second substrate and the mixed adhesive uniformly distributed between the first substrate and the second substrate, and the mixed adhesive is a mixture of the filling adhesive and the magnetic material. Since uniform distribution of the mixed adhesive is implemented before pressing and bonding the first substrate and the second substrate, a gap between the first substrate and the second substrate after press-fitting is more uniform, which avoids occurrence of the phenomenon of uneven display, improves a packaging effect, and simplifies processing adjustment.

An embodiment of the present disclosure provides a display device DA. The display device includes the display panel DP provided by the above-described embodiment.

In this embodiment, the display device includes the display panel according to the above mentioned embodiment, the display panel includes a first substrate302, a second substrate303, and mixed adhesive301uniformly distributed between the first substrate302and the second substrate303; wherein, the mixed adhesive301is a mixture of a filling adhesive and a magnetic material.

In summary, in the embodiment of the present disclosure, the display device includes the display panel, the display panel includes the first substrate, the second substrate and the mixed adhesive uniformly distributed between the first substrate and the second substrate, and the mixed adhesive is a mixture of the filling adhesive and the magnetic material. Since uniform distribution of the mixed adhesive is implemented before pressing and bonding the first substrate and the second substrate, a gap between the first substrate and the second substrate after press-fitting is more uniform, which avoids occurrence of the phenomenon of uneven display, improves a packaging effect, and simplifies processing adjustment.

Various embodiments in the present specification are described in a progressive manner, differences of each embodiment from the other embodiments are emphatically illustrated, and for the identical or the similar parts among respective embodiments, the embodiments can be referred to mutually.

Finally, it should also be noted that in this specification, terms like “first” and “second” are only used to differentiate one entity or operation from another, but are not necessarily used to indicate any practical relationship or order between these entities or operations. Moreover, terms such as “include”, “comprise” or any variation of the terms mean “including but not limited to”. Therefore, a process, method, object, or device that includes a series of elements not only includes these elements, but also includes other elements that are not specified expressly, or may further include inherent elements of the process, method, object or device. In the case that there are no more limitations, in the context of an element that is defined by “includes one . . . ”, the process, method, object or device that includes the element may include other identical elements.

The packaging method of the display panel, the display panel, and the display device provided by the embodiments of the present disclosure are described in detail above; specific examples are used in this specification for expounding the principles and the implementation modes of the embodiments of the present disclosure, and the above description of the embodiments is only used for helping understand the method according to the embodiments of the present disclosure and its core idea; meanwhile, those ordinarily skilled in the art will make changes in the specific implementation modes and the application scope, according to the idea of the embodiments of the present disclosure. In summary, the contents of this specification should not be construed as limiting the embodiments of the present disclosure.