Heat dissipation plate assembly, display module and its assembling method

A display substrate includes a first region, a second region, and a bendable region between the first region and the second region, and a heat dissipation plate assembly for heat dissipation of the display substrate includes: a first release film; a heat dissipation plate, comprising a first portion and a second portion which are separated by a space and located on the first release film; a protective film, located on a side of the heat dissipation plate distal to the first release film, having a substantially same shape as the heat dissipation plate, and comprising a third portion located on the first portion and a fourth portion located on the second portion, the third portion being able to be bonded to the first region of the display substrate, and the fourth portion being able to be bonded to the second region of the display substrate; and a second release film, located on a side of the protective film distal to the heat dissipation plate and having a substantially same shape as the first release film.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims a priority to Chinese Patent Application No. 201910753736.9 filed on Aug. 15, 2019, the disclosures of which are incorporated in their entirety by reference herein.

TECHNICAL FIELD

The present disclosure relates to the field of manufacturing display products, in particular to a heat dissipation plate assembly, a display module and its assembling method.

BACKGROUND

With the development of display industry, an organic light-emitting diode (OLED), which is a new light-emitting device, has been widely researched and applied in the field of display technology. One advantage of the OLED is that it can be applied to flexible displays, is capable of achieving frame narrowing, bending, full-screen frame narrowing, etc., and thus has wide development prospects.

SUMMARY

In a first aspect, embodiments of the present disclosure provide a heat dissipation plate assembly for heat dissipation of a display substrate, the display substrate including a first region, a second region, and a bendable region between the first region and the second region, wherein the heat dissipation plate assembly includes: a first release film; a heat dissipation plate, including a first portion and a second portion which are separated by a space and located on the first release film; a protective film, located on a side of the heat dissipation plate distal to the first release film, having a substantially same shape as the heat dissipation plate, and including a third portion located on the first portion and a fourth portion located on the second portion, the third portion being able to be bonded to the first region of the display substrate, and the fourth portion being able to be bonded to the second region of the display substrate; and a second release film, located on a side of the protective film distal to the heat dissipation plate and having a substantially same shape as the first release film, wherein the heat dissipation plate is integrated with the protective film, and a portion of the protective film corresponding to the bendable region of the display substrate is removed while the heat dissipation plate is subjected to a cutting processing.

According to some optional embodiments of the present disclosure, the protective film is connected with the heat dissipation plate through a first connection adhesive layer.

According to some optional embodiments of the present disclosure, the first connection adhesive layer is formed of a pressure sensitive adhesive.

According to some optional embodiments of the present disclosure, a second connection adhesive layer is provided between the second release film and the protective film.

According to some optional embodiments of the present disclosure, the second connection adhesive layer is formed of a pressure sensitive adhesive.

According to some optional embodiments of the present disclosure, the heat dissipation plate includes one or more of grid tape, foam, graphite sheet, and copper foil.

According to some optional embodiments of the present disclosure, the display substrate is a flexible display substrate.

According to some optional embodiments of the present disclosure, the display substrate is an organic light-emitting diode (OLED) display substrate.

In a second aspect, embodiments of the present disclosure further provide a display module including a heat dissipation plate assembly for heat dissipation of a display substrate, the display substrate including a first region, a second region, and a bendable region between the first region and the second region, wherein the heat dissipation plate assembly includes: a first release film; a heat dissipation plate, including a first portion and a second portion which are separated by a space and located on the first release film; a protective film, located on a side of the heat dissipation plate distal to the first release film, having a substantially same shape as the heat dissipation plate, and including a third portion located on the first portion and a fourth portion located on the second portion, the third portion being able to be bonded to the first region of the display substrate, and the fourth portion being able to be bonded to the second region of the display substrate; and a second release film, located on a side of the protective film distal to the heat dissipation plate and having a substantially same shape as the first release film, wherein the heat dissipation plate is integrated with the protective film, and a portion of the protective film corresponding to the bendable region of the display substrate is removed while the heat dissipation plate is subjected to a cutting processing.

According to some optional embodiments of the present disclosure, the protective film is connected with the heat dissipation plate through a first connection adhesive layer.

According to some optional embodiments of the present disclosure, the first connection adhesive layer is formed of a pressure sensitive adhesive.

According to some optional embodiments of the present disclosure, a second connection adhesive layer is provided between the second release film and the protective film.

According to some optional embodiments of the present disclosure, the second connection adhesive layer is formed of a pressure sensitive adhesive.

According to some optional embodiments of the present disclosure, the heat dissipation plate comprises one or more of grid tape, foam, graphite sheet, and copper foil.

According to some optional embodiments of the present disclosure, the display substrate is a flexible display substrate which is an OLED display substrate.

In a third aspect, embodiments of the present disclosure further provide a method for assembling a display module, including: bonding a cover plate and a display substrate; bonding a heat dissipation plate assembly to the display substrate; and bending a bendable region of the display substrate to which the heat dissipation plate assembly has been bonded, wherein the display substrate includes a first region, a second region and the bendable region between the first region and the second region, wherein the heat dissipation plate assembly includes: a first release film; a heat dissipation plate, including a first portion and a second portion which are separated by a space and located on the first release film; a protective film, located on a side of the heat dissipation plate distal to the first release film, having a substantially same shape as the heat dissipation plate, and including a third portion located on the first portion and a fourth portion located on the second portion, the third portion being able to be bonded to the first region of the display substrate, and the fourth portion being able to be bonded to the second region of the display substrate; and a second release film, located on a side of the protective film distal to the heat dissipation plate and having a substantially same shape as the first release film, wherein the heat dissipation plate is integrated with the protective film, and a portion of the protective film corresponding to the bendable region of the display substrate is removed while the heat dissipation plate is subjected to a cutting processing.

According to some optional embodiments of the present disclosure, the bonding the bonding the heat dissipation plate assembly to the display substrate includes: removing the protective film on a side of the display substrate distal to the cover plate; removing the second release film on the protective film of the heat dissipation plate assembly; bonding the heat dissipation plate assembly, from which the second release film has been removed, to the side of the display substrate distal to the cover plate; and removing the first release film and the second portion of the heat dissipation plate.

According to some optional embodiments of the present disclosure, the bending the bendable region of the display substrate to which the heat dissipation plate assembly has been bonded includes: bending the bendable region of the display substrate to which the heat dissipation plate assembly has been bonded so as to bend the fourth portion reversely and bond the reversely bended fourth portion to the first portion of the heat dissipation plate.

According to some optional embodiments of the present disclosure, the display substrate is a display motherboard or a single display substrate.

According to some optional embodiments of the present disclosure, prior to the bonding the cover plate and the display substrate, the method further includes cutting the display motherboard non-rectangularly to obtain a plurality of display substrates.

DETAILED DESCRIPTION

In related art, a display substrate has a display surface and a non-display surface that are arranged opposite to each other. The display surface displays an image, and the non-display surface does not display any image. When performing Pad bending, a Pad area of the display substrate can be bent onto the non-display surface of the display substrate to reduce a width of the non-display area of the display substrate, thereby reducing a size of the frame of the display device. At present, a protective film is usually bonded to the non-display surface of the display substrate. In order to avoid an influence of a stress generated in the bending process on the pad area, the protective film of the area to be bent of the display substrate needs to be removed before Pad bending. The non-display surface of the display substrate is also referred to as a back side of the display substrate, the protective film bonded to the non-display surface of the display substrate is also referred to as a back film, and the area to be bent is located in the Pad area. Due to high adhesion of the back film, it is difficult to tear off the back film in the bendable region.

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 clearly and completely described hereinafter with reference to the accompanying drawings for the embodiments of the present disclosure. Obviously, the described embodiments are a part, rather than all, of the embodiments of the present disclosure. All the other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure fall within the protection scope of the present disclosure.

At present, there are two methods which are usually used to remove the protective film on the back side of the display substrate. One is to use a laser to burn off the protective film at the bendable position, and the other is to apply a protective film which has been slotted to the back side of the substrate. However, the laser burning process may damage the display substrate and cause residual back film adhesive to be not uniform, resulting in uneven stress during the bending process and thus in poor removal effect; on the other hand, the protective film which has been slotted has high cost.

In view of the above technical problems, this embodiment provides a heat dissipation plate assembly, in which a protective film is integrated with a heat dissipation plate. When cutting the heat dissipation plate, a portion of the protective film corresponding to the bendable region of the display substrate is removed simultaneously and then bonded to a back side of the display substrate. As compared with the method in conventional technology, in which the portion of the protective film corresponding to the bendable region of the display substrate is removed separately after the protective film has been bonded to the back side of the display substrate, these embodiments of the present disclosure allow for a reduction of the step of removing the portion of the protective film corresponding to the bendable region of the display substrate separately after the protective film has been bonded to the back side of the display substrate. Therefore, the problems of damage to the display substrate and poor removal effect caused by laser burning part of the protective film are avoided, and the cost is also reduced.

Specifically, as shown inFIGS. 1 and 2, this embodiment of the present disclosure provides a heat dissipation plate5assembly (SCF) for heat dissipation of a display substrate40. Here, those skilled in the art can understand thatFIGS. 1 and 2show schematic views of cross-sections in a thickness direction of a structure of the heat dissipation plate5assembly and a structure of a display module, respectively. The display substrate40includes a first region401, a second region402, and a bendable region403between the first region401and the second region402.

The heat dissipation plate5assembly includes: a first release film6; the heat dissipation plate5, including a first portion51and a second portion52separated by a space100and located on the first release film5; a protective film3located on a side of the heat dissipation plate5distal to the first release film6, having a substantially same shape as the heat dissipation plate5, and including a third portion31located on the first portion51and a fourth portion32located on the second portion52, the third portion31being able to be bonded to the first region401of the display substrate, and the fourth portion32being able to be bonded to the second region402of the display substrate; and a second release film1, located on a side of the protective film3distal to the heat dissipation plate5and having a substantially same shape as the first release film6.

Here, those skilled in the art can understand that by the protective film3having the same shape as the heat dissipation plate5as mentioned above is meant that the protective film3has a substantially same cross-sectional shape as the heat dissipation plate5in the exemplary cross-sectional view as shown inFIG. 1.

Similarly, by the second release film1having the same shape as the first release film6is meant that the second release film1has a substantially same cross-sectional shape as the first release film6in the exemplary cross-sectional view as shown inFIG. 1.

Here, the heat dissipation plate5mainly functions to dissipate heat, absorb shocks and shield an electromagnetic field. Main materials constituting the heat dissipation plate5include one or more of grid tape, foam, graphite sheet, and copper foil. Layers of the heat dissipation plate5are bonded together by using an electrically conductive adhesive. The grid tape mainly functions to avoid generation of air bubbles when bonding the heat dissipation plate5and an actual display substrate product together. Foam mainly functions to absorb shocks so as to enable damage to be reduced when the display substrate product is subjected to impacts or the like. The graphite sheet mainly functions to dissipate heat and prevent the display effect from be reduced by an excessively high temperature. Further, copper foil mainly functions to shield the electromagnetic field and dissipate heat.

With the above technical solution, the protective film3and the heat dissipation plate5are integrated together, that is, after the protective film3and the heat dissipation plate5have been bonded, the protective film3is cut while the heat dissipation plate5is subjected to a cutting processing, which is equivalent to slotting a portion of the protective film3corresponding to the bendable region of the display substrate, except that this step is performed at the same time of processing the heat dissipation plate5. Therefore, the above technical solution reduces the cost as compared with the method in the conventional technology in which the protective film3is slotted separately, and avoids damage to the substrate and poor removal effect caused by laser burning as compared with the method in the conventional technology in which laser burning is adopted.

In this embodiment, optionally, the protective film3and the heat dissipation plate5are connected through a first connection adhesive layer4. Here, those skilled in the art can understand that the first connection adhesive layer4is not an essential component. Optionally, there may be no intermediate layer between the protective film3and the heat dissipation plate5, and the protective film3and the heat dissipation plate5are directly connected and bonded.

The first connection adhesive layer4is used to tightly bond the protective film3to the heat dissipation plate5so as to ensure a tight connection between the protective film3and the heat dissipation plate5, and both the heat dissipation plate5and the protective film3are slotted, that is, a portion of the heat dissipation plate5that can be bonded to the bendable region of the display substrate is removed, so as to ensure a better slotting effect.

The first connection adhesive layer4can be made of various materials. In this embodiment, the first connection adhesive layer4is formed of a pressure-sensitive adhesive, but it is not limited thereto.

In this embodiment, a second connection adhesive layer2is provided between the second release film1and the protective film3.

The second connection adhesive layer2is used to connect the second release film1and the protective film3to ensure a tight connection between the protective film3and the second release film1as well as flatness of a surface of the second release film1, so that the second release film1can play a better protective role. Here, those skilled in the art can understand that the second connection adhesive layer2is not an essential component. Optionally, there may be no intermediate layer between the second release film1and the protective film3, and the second release film1and the protective film3are directly connected and bonded.

The second connection adhesive layer2may be made of various materials. In this embodiment, the second connection adhesive layer2is formed of a pressure-sensitive adhesive, but it is not limited thereto.

As shown inFIGS. 1 and 2, an embodiment of the present disclosure further provides a display module including the heat dissipation plate5assembly as described above.

In this embodiment, the display module further includes a touch layer30arranged on a display side of the display substrate40, a cover plate20arranged on the touch layer30, and a protective film10arranged on the cover plate20.

The touch layer30is connected to the display substrate40through an optical adhesive50, and the cover plate20is connected to the touch layer30through the optical adhesive50.

The display substrate40includes a first region401, a second region402, and a bendable region403between the first region401and the second region402(the bendable region403is distinguished from the first region401and the second region402by a dashed line inFIG. 2). In addition, as shown inFIG. 2, a circuit board60is bound and connected to the second region402.

After the heat dissipation plate5assembly has been bonded to a back side of the display substrate40and before the bendable region403of the display substrate40is bent, the second portion52of the heat dissipation plate5has been removed, that is, after the display substrate40has been bent, the fourth portion32of the protective film3is reversely bent and bonded to a back side of the first portion51of the heat dissipation plate5, so that the heat dissipation plate5connected to the back side of the display substrate40remains substantially the same in thickness after the bending, and an effect of thinning the display module is achieved.

By integrating the protective film3with the heat dissipation plate5as one piece, the portion of the protective film3corresponding to the bendable region403of the display substrate40is synchronously cut in the step of cutting the heat dissipation plate5, which eliminates the step of removing part of the protective film3on the display substrate40separately as compared to the method in the conventional technology in which the portion of the protective film3corresponding to the bendable region403of the display substrate40is removed, thereby avoiding the problem of poor removal effect of the portion of the protective film3caused by the laser and also reducing the cost.

In the embodiment of the present disclosure, the display substrate is a flexible display substrate, and the display module is particularly suitable for an OLED display device. The display module further includes a flexible circuit board, a printed circuit board, a backplane, and the like.

In addition, an embodiment of the present disclosure further provides a method for assembling a display module, including:

S1: bonding a cover plate and a display substrate40;

S2: bonding the above-described heat dissipation plate5assembly to the display substrate40; and

S3: bending a bendable region403of the display substrate40to which the heat dissipation plate5assembly has been bonded.

In this embodiment, the display substrate includes, for example, a first region401, a second region402, and a bendable region403between the first region401and the second region402. The bonding the above-described heat dissipation plate5assembly to the display substrate40includes:

S21: removing the protective film3on a side of the display substrate40distal to the cover plate;

S22: removing the second release film1on the protective film3of the heat dissipation plate5assembly;

S23: bonding the heat dissipation plate5assembly, from which the second release film1has been removed, to the side of the display substrate40distal to the cover plate, so that the third portion31of the protective film3is bonded to the first region401of the display substrate40, and the fourth portion32of the protective film3is bonded to the second region402of the display substrate40; and

S24: removing the first release film6and the second portion52of the heat dissipation plate5.

After the heat dissipation plate5assembly has been bonded to the back side of the display substrate40and before the bendable region403of the display substrate40is bent, the second portion52of the heat dissipation plate5has been removed, that is, after the display substrate40has been bent, the fourth portion32of the protective film3is reversely bent and bonded to a back side of the first portion51of the heat dissipation plate5, so that the heat dissipation plate5connected to the back side of the display substrate40remains substantially the same in thickness after the bending, and an effect of thinning the display module is achieved.

In this embodiment, the step S3of bending the bendable region403of the display substrate40to which the heat dissipation plate5assembly has been bonded includes: bending the bendable region403of the display substrate40to which the heat dissipation plate5assembly has been bonded, so that the fourth portion32of the protective film3is bent reversely and bonded to the first portion51of the heat dissipation plate5.

In this embodiment, the display substrate40includes the first region401, the second region402, and the bendable region403between the first region401and the second region402. The method for assembling the display module further includes step S4: binding and connecting a circuit board60to the second region402of the display substrate40after the display substrate40has been bent.

In this embodiment, the display substrate40is a display motherboard that includes a plurality of display substrates arranged in an array, or is a single display substrate.

In this embodiment, when the display substrate is a display motherboard, prior to step S1of bonding the cover plate and the display substrate, the method further includes S0: performing a cutting process including chamfering and non-rectangularly cutting on the display motherboard to obtain a plurality of display substrates.

The above are some optional embodiments of the present disclosure. It should be noted that several improvements and modifications can be made by those of ordinary skill in the art, without departing from the principles described in the present disclosure. These improvements and modifications should also be considered as falling within the scope of this disclosure.