Patent ID: 12262474

DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION

The technical solutions of the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings of the embodiments of the present disclosure. Apparently, the described embodiments are merely some but not all of the embodiments of the present disclosure. All other embodiments obtained by a person skilled in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure. In addition, it should be understood that the specific implementations described herein are merely used for describing and illustrating the present disclosure, but are not intended to limit the present disclosure. In the present disclosure, unless otherwise stated, the directional terms such as “up” and “down” generally refer to directions when a device is in actual use or a working state, and specifically refer to drawing directions in the corresponding drawing; and “inside” and “outside” refer to positions relative to the contour of the device.

A display panel and a method for assembling same, and a spliced display device is provided in the embodiments of the present disclosure, and details are described below. It should be noted that, the description order of the following embodiments is not intended to limit preference orders of the embodiments.

Referring toFIG.1, the embodiment of the present disclosure provides a display panel100. The display panel includes a back panel11, a main display body10, a flexible base plate15, a printed circuit board16, an adhesive layer17, and a protective layer18. The main display body10includes a substrate101and a display portion12, a connecting portion13, and a binding portion14that are disposed on the substrate101.

Optionally, the display portion12may be one of a micro LED display device, a sub-millimeter LED display device, a liquid crystal display device, an OLED display device, or a QLED display device.

Optionally, the flexible base plate15may be a chip on film or a flexible circuit board that is not a chip on film.

The display portion12, the connecting portion13, and the binding portion14are all disposed on the back panel11. The binding portion14is located on a side of the display portion12and is connected to the display portion12using the connecting portion13.

The flexible base plate15includes a first end portion151, a second end portion152, and a bent portion153connecting the first end portion151to the second end portion152. The first end portion151is bonded to the binding portion14. The second end portion152is fixedly disposed on a side of the back panel11that is away from the display portion12.

The second end portion152is bonded to the printed circuit board16. The printed circuit board16is fixedly disposed on a side of the back panel11that is away from the display portion12.

In some embodiments, the printed circuit board16may also be omitted. That is to say, the second end portion152is fixed on the back panel11.

The protective layer18is disposed on the first end portion151. The protective layer18covers and is connected to the first end portion151, and covers and is attached to the connecting portion13, so as to reduce the risk of separating the flexible base plate15from the display panel100. Therefore, a degree of bending of the flexible base plate15can be increased, and a bending distance of the flexible base plate15can be reduced.

In detail, one end of the protective layer18extends to a junction of the first end portion151and the bent portion153at most, and an other end of the protective layer18extends to the connecting portion13and is connected to the connecting portion13. The protective layer18does not cover a bent area to reduce the bending distance of the flexible base plate15.

Optionally, the protective layer18may be a thermal curing adhesive, a moisture curing adhesive, or a light curing adhesive.

A larger connection area of the protective layer18and the connecting portion13indicates a lower risk of separating the flexible base plate15from the display panel100. Optionally, when a connecting width between the protective layer18and the connecting portion13is 1 mm, a thickness of the protective layer18is 0.4 mm, and the bending distance of the flexible base plate15is 0.2 mm.

Optionally, the printed circuit board16is fixedly connected to the back panel11using an adhesive layer17.

Optionally, the adhesive layer17may be a double-sided foam adhesive.

Optionally, the substrate101may be a flexible substrate, such as polyimide, or may be a rigid substrate, such as glass, sapphire, silicide, or the like.

Optionally, the binding portion14includes a plurality of terminals. The flexible base plate15may be bonded to the plurality of terminals using conductive glue.

In a pattern of a vertical section, the bent portion153includes an inflection point Q, and a tangent line CC passing through the inflection point Q is perpendicular to a plane where the binding portion14is located.

It should be noted that the vertical section is perpendicular to the plane where the display panel100is located. If the plane where the display panel100is located is defined to be parallel to a plane composed of an axis x and an axis y in a three-dimensional Cartesian coordinate system, a vertical plane is parallel to the plane composed of the axis x and the axis y in the three-dimensional Cartesian coordinate system, and the vertical section sequentially extends through the first end portion151, the bent portion153, and the second end portion152.

In an extending direction of the bent portion153, a length L1from the inflection point Q to the first end portion151is less than a length L2from the inflection point Q to the second end portion152.

In the present embodiment, the bent flexible base plate15is in a tightened state, and the inflection point Q of the flexible base plate15is disposed closer to a side of the first end portion151. That is to say, the length L1from the inflection point Q to the first end portion151is less than the length L2from the inflection point Q to the second end portion152. Therefore, a bending distance H of the flexible base plate15is reduced, so as to achieve a narrow frame or even no frame, and splicing gaps of the spliced display device are reduced.

Optionally, in the present embodiment, a distance D1from the first end portion151to the tangent line CC is less than a distance D2from the second end portion152to the tangent line CC, so that the inflection point Q is closer to a side of the first end portion151.

Optionally, since the distance D1from the first end portion151to the tangent line CC is less than the distance D2from the second end portion152to the tangent line CC, a part of the bent portion153squeezes an end corner of the binding portion14.

In detail, the bent portion153includes a transition portion153aconnected to the first end portion151. The transition portion153aabuts against the end corner of the binding portion14. That is to say, the transition portion153asqueezes the end corner of the binding portion14. At this point, a stress on the transition portion153aincludes a reaction force of the end corner of the binding portion14and a bending stress of the transition portion itself.

Optionally, the stress on the transition portion153ais less than 12.5 newtons, such as 12 newtons, 11 newtons, 10 newtons, 9 newtons, 8 newtons, 7 newtons, 6 newtons, 5 newtons, 4 newtons, 3 newtons, 2 newtons, or 1 newton, so as to reduce the risk of breakage of traces in the flexible base plate15.

Optionally, the stress on the transition portion153ais greater than 1.7 newtons, so as to cause the bending distance of the flexible base plate15to be less than or equal to 0.2 mm as far as possible.

If the flexible base plate15requires a smaller distance, the second end portion152may be moved to an other side of the back panel11to reduce the bending distance H of the flexible base panel15, thereby increasing the stress on the transition portion153a.

After the flexible base plate15is bent, the stress on the transition portion153ais related to the thickness, the elastic modulus, and the bending distance of the flexible base plate15. When the thickness is the only variable, a larger thickness indicates a larger stress on the transition portion153a. When the elastic modulus is the only variable, a larger elastic modulus indicates a larger stress on the transition portion153a. When the bending distance is the only variable, a larger bending distance indicates a smaller stress on the transition portion153a.

The back panel11includes a flat portion111connected to the display portion12and the binding portion14and a bump112disposed on a side of the flat portion111that is away from the display portion12. The printed circuit board16is fixedly disposed on a face of the bump112that is away from the flat portion111using the adhesive layer17.

The bump112can increase a distance between the first end portion151and the second end portion152, thereby reducing the bending distance of the flexible base plate15.

Optionally, the bump112is spaced apart from the flexible base plate15to prevent the bump112from interfering with the bending of the flexible base plate15.

Optionally, a material of the back panel11may be aluminum, iron, or alloy.

Correspondingly, an embodiment of the present disclosure further provides a method for assembling a display panel100of the above embodiment. The method includes steps as follows.

Step B1: Provide a to-be-bent display panel, wherein the to-be-bent display panel includes a back panel, a main display body, a flexible base plate, and a printed circuit board, the main display body is disposed on the back panel, one end of the flexible base plate is bound to the main display body, and an other end of the flexible base plate is bound to the printed circuit board.

Step B2: Bend the flexible base plate, so that the printed circuit board is folded to a side of the back panel that is away from the main display body; and squeeze the bent flexible base plate using a first limiting plate of a limiting assembly, and squeeze a side of the back panel that is away from the flexible base plate using a second limiting plate of the limiting assembly, so as to limit a bending distance of the flexible base plate.

Step B3: Pull the printed circuit board, so that the flexible base plate enters a tightened state under a pulling force.

Step B4: Fix the printed circuit board to the back panel, wherein the flexible base plate is still in the tightened state; and Step B5: Separate the display panel from the limiting assembly.

According to the method for assembling a display panel100of the present embodiment, the limiting assembly is used to limit the bending distance of the flexible base plate15in a prepressing manner, and then the flexible base plate15is shaped, thereby achieving the effect of reducing the bending distance.

The steps of the method for assembling a display panel100are described below.

Referring toFIG.2, step B1is to provide a to-be-bent display panel100. The to-be-bent display panel100includes a back panel11, a main display body10, a flexible base plate and a printed circuit board16. The main display body10is disposed on the back panel11. One end of the flexible base plate15is bonded to the main display body10. An other end of the flexible base plate15is bonded to the printed circuit board16. The main display body10includes a display portion12and a binding portion14.

Then step B2is performed.

Referring toFIG.3, step B2includes: bending the flexible base plate15, so that the printed circuit board16is folded to a side of the back panel11that is away from the main display body10, squeezing the bent flexible base plate15using a first limiting plate21of a limiting assembly200, and squeezing a side of the back panel11that is away from the flexible base plate15using a second limiting plate22of the limiting assembly200, so as to limit a bending distance of the flexible base plate15.

Therefore, in the present embodiment, the flexible base plate15is prepressed using step B2to preliminarily reduce the bending distance H of the flexible base plate15.

Optionally, the limiting assembly200further includes a first flexible layer23, a second flexible layer24, and a base plate25. The first limiting plate21is disposed on one side of the base plate25, and the second limiting plate22is disposed on an other side of the base plate25. The first flexible layer23is disposed on a side of the first limiting plate21that faces the second limiting plate22. The second flexible layer24is disposed on a side of the second limiting plate22that faces the first limiting plate21.

The first flexible layer23and the second flexible layer24are in contact with the display panel100. On the one hand, the limiting assembly200can be prevented from crushing the display panel100, and on the other hand, it is convenient to put in and take out the display panel100.

Optionally, the first limiting plate21may be slidably disposed on the base plate25to facilitate adjustment of the bending distance of the flexible base plate15and facilitate adaption to display panels100of different sizes.

Then step B3is performed.

Referring toFIG.4, step B3includes: pulling the printed circuit board16, so that the flexible base plate15enters a tightened state under a pulling force.

In detail, step B3includes step B31, step B32, and step B33.

Step B31: Pull the printed circuit board16to a first preset angle α, so that the flexible base plate15enters a tightened state, and maintain the flexible base plate in the tightened state for a first set duration.

Optionally, the first preset angle α is greater than or equal to 60 degrees. For example, the first preset angle may be 60 degrees, 70 degrees, 80 degrees, or 90 degrees. When the printed circuit board16is pulled, the flexible base plate15is prevented from being scratched by the binding portion14.

Optionally, a rope is used to pull the printed circuit board16in a direction perpendicular to a plane where the display panel100is located, that is, in a direction at a preset angle of 90 degrees, to ensure that the flexible base plate15is not scratched by the binding portion14.

It should be noted that the use of a rope (not shown in the figure) to pull the printed circuit board16is only one of the ways to pull the printed circuit board16. The present embodiment is not limited to this method. For example, an automated device, such as a manipulator may be used to pull the printed circuit board16.

Optionally, the first set duration is greater than or equal to 30 seconds. For example, the first set duration may be 30 seconds, 1 minute, 3 minutes, 5 minutes, 10 minutes, or the like, so as to pre-limit the bending distance H of the flexible base plate15and buffer the strength of instant bending of the flexible base plate15, thereby reducing the risk of damage to the traces in the flexible base plate15.

Since the protective layer18is used to bond the first end portion151to the connecting portion13, the pulling force for pulling the printed circuit board16can be appropriately increased without separating the flexible base plate15from the display panel100. Therefore, the bending distance of the flexible base plate15can be further reduced.

Step B32: Pull the printed circuit board16at a constant pulling force, lower the printed circuit board16to a second preset angle β, and maintain the printed circuit board to be at the second preset angle for a second set duration.

The printed circuit board16and the flexible base plate15are temporarily fixed at the second preset angle β, so as to reduce the degree of bending of the flexible base plate15and avoid the risk of damage to the flexible base plate15due to instant bending.

The second preset angle β is greater than or equal to 60 degrees and less than 90 degrees. For example, the second preset angle may be 60 degrees, 70 degrees, or 80 degrees.

Optionally, the second set duration is greater than or equal to 30 seconds. For example, the second set duration may be 30 seconds, 1 minute, 3 minutes, 5 minutes, 10 minutes, or the like. In this way, the flexible base plate15has a stable bending state. With the decline of the printed circuit board16, a larger degree of bending of the flexible base plate15and a larger applied stress indicate a larger risk of damage to the flexible base plate15. Therefore, the second set duration is greater than the first set duration. The flexibility of the flexible base plate15to bend is improved, and the risk of damage to the flexible base plate15is further reduced.

Step B33: Pull the printed circuit board16at the constant pulling force, so that the printed circuit board16approaches the back panel11, until the printed circuit board16is parallel to a plane where the back panel11is located, and maintain the printed circuit board to be parallel to the plane for a third set duration,

If a rope is used to pull the printed circuit board16, the rope is fixed in a groove of a fixing block113of the back panel11to fix the bending shape of the flexible base plate15.

Optionally, the third set duration is greater than or equal to 30 seconds. For example, the third set duration may be 30 seconds, 1 minute, 3 minutes, 5 minutes, 10 minutes, or the like. In this way, the flexible base plate15has a stable bending state.

The third set duration is greater than the second set duration, so that the flexible base plate15has a stable bending state.

In the present embodiment, the flexible base plate15is pulled using step B3, so that the inflection point of the flexible base plate15approaches a side of the first end portion151. In addition, on a basis of preliminary reduction of the bending distance of the flexible base plate15, the bending distance of the flexible base plate15is further minimally reduced. In this way, the bending distance of the flexible base plate15can reach a target bending distance, and the risk of damage to the traces in the flexible base plate15can be reduced.

Then step B4is performed.

Referring toFIG.5, step B4is to fix the printed circuit board16to the back panel11. The flexible base plate15is still in a tightened state.

Optionally, the back panel11is fixedly connected to the printed circuit board16using an adhesive layer17.

Then step B5is performed.

Referring toFIG.1, step B5is to separate the display panel100from the limiting assembly200. The distance D1from the first end portion151to the tangent line CC is less than the distance D2from the second end portion152to the tangent line CC.

In this way, the method for assembling a display panel100of the present embodiment is completed.

Referring toFIG.6, correspondingly, an embodiment of the present disclosure further provides a spliced display device1000. The spliced display device includes the plurality of display panels100of the above embodiments. The plurality of display panels100are spliced.

A display panel and a method for assembling same and a spliced display device provided in the embodiments of the present disclosure are described above in detail. Although the principles and implementations of the present disclosure are described by using specific examples in this specification, the descriptions of the foregoing embodiments are merely used for helping understand the method and the core idea of the method of the present disclosure. Meanwhile, a person of ordinary skill in the art may make modifications to the specific implementations and application range according to the ideas of the present disclosure. In conclusion, the content of the specification is not to be construed as a limitation to the present disclosure.