CN112700721A - Middle-small size flat display screen laminating process - Google Patents
Middle-small size flat display screen laminating process Download PDFInfo
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- CN112700721A CN112700721A CN202011560359.6A CN202011560359A CN112700721A CN 112700721 A CN112700721 A CN 112700721A CN 202011560359 A CN202011560359 A CN 202011560359A CN 112700721 A CN112700721 A CN 112700721A
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Abstract
The invention discloses a middle-small-size flat display screen laminating process which comprises the steps of respectively laminating a display panel and a protection panel on two sides of a hot-melt optical adhesive film, forming a body to be solidified through cold pressing, carrying out pressure defoaming on the body to be solidified, and solidifying the body to be solidified. The display screen laminating process in the embodiment of the invention is suitable for medium-sized and small-sized flat display screens, in the display screen laminating process, the cold pressing and the pressurizing defoaming steps can adopt a quick pressing mode, the temperature rise and the heating are not needed, the production time is greatly shortened, the hot-melt optical adhesive film cannot deform due to the heating, the adhesive film rebounds, the laminating quality of the display screen is influenced, or the adhesive overflows due to the heating and the melting, in addition, the display panel is not damaged due to the influence of long-time heating, and the later-period display effect of the display screen is influenced.
Description
Technical Field
The invention relates to the technical field of display screen laminating, in particular to a laminating process of a medium-small-size flat display screen.
Background
The optical cement can be used for cementing transparent optical elements, has good cementing strength and is suitable for the jointing of small and medium-sized display products. Among the correlation technique, adopt optical cement to bond display panel, protection panel etc. in the display screen, laminating in-process optical cement is rebounded easily, leads to the display screen later stage to warp, and the excessive gluey condition appears easily in the optical cement, has reduced the laminating yield of display screen to, attached process duration is longer, influences the laminating efficiency of display screen.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a middle-small-size flat display screen laminating process which can improve the laminating quality and the laminating efficiency of a display screen.
The attaching process of the medium-small size flat display screen in the embodiment of the invention comprises the following steps,
attaching, namely respectively attaching a display panel and a protective panel to two sides of the hot-melt optical adhesive film;
cold pressing to form a body to be solidified;
carrying out pressure defoaming on the body to be solidified;
and curing the body to be cured.
The attaching process of the medium-small-size flat display screen, provided by the embodiment of the invention, at least has the following beneficial effects:
the display screen attaching process in the embodiment of the invention is suitable for the flat display screens with medium and small sizes, and the flat display screens with medium and small sizes have small attaching area, do not have corner structures in the attaching area, are not easy to generate bubbles in the attaching process and have high attaching flatness. In the display screen laminating process, cold pressing and pressurization defoaming steps can adopt a quick pressing mode, heating is not required, the production time is greatly shortened, the hot-melt optical adhesive film cannot deform due to heating, the adhesive film rebounds, the laminating quality of the display screen is influenced, or glue overflowing is caused due to heating and melting, and in addition, the display panel is not damaged due to the influence of long-time heating, and the display effect in the later stage of the display screen is influenced.
According to some embodiments of the present invention, the attaching step includes tearing off a release film at a side of the hot-melt optical adhesive film, and attaching the hot-melt optical adhesive film to the display panel or the protection panel.
According to some embodiments of the invention, the cold pressing step includes pressing the protection panel and/or the display panel with a jig to close the hot-melt optical adhesive film and the display panel and the attachment area of the protection panel.
According to some embodiments of the invention, the cold pressing step is performed at room temperature.
According to some embodiments of the invention, the cold pressing and/or the pressure debubbling step is performed under a vacuum environment.
According to some embodiments of the present invention, the body to be cured is inspected or reworked after the pressure defoaming step.
According to some embodiments of the present invention, the body to be cured is subjected to ultraviolet curing.
According to some embodiments of the present invention, the body to be cured is thermally cured.
According to some embodiments of the present invention, the body to be cured is subjected to thermal curing and ultraviolet curing.
According to some embodiments of the invention, after the curing step is completed, final inspection or rework is performed.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a schematic flow chart of an embodiment of a process for attaching a small-sized flat display panel according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a process for attaching a small-sized flat display panel according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is two or more, and the above, below, exceeding, etc. are understood as excluding the present numbers, and the above, below, within, etc. are understood as including the present numbers. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, an embodiment of the present invention provides a process for bonding a medium-and small-sized flat display screen, including the steps of first bonding a display screen with a hot-melt optical adhesive film, and respectively bonding a display panel and a protective panel on two sides of the hot-melt optical adhesive film; then, cold pressing the combined parts to combine the parts to form a body to be solidified; and then pressurizing and defoaming the body to be cured, and finally curing the body to be cured to completely bond and fix the display panel and the protection panel to complete the bonding of the display screen.
The display panel or the protection panel is respectively attached to two sides of the hot-melt optical adhesive film, or two sides of the hot-melt optical adhesive film are respectively attached to the display panel or the protection panel, so that the hot-melt optical adhesive film, the display panel and the protection panel are mutually attached, at the moment, only adhesive force exists between the display panel and the hot-melt optical adhesive film and between the protection panel and the hot-melt optical adhesive film, the display panel and the protection panel are not provided with adhesive force, and the display panel and the protection panel are preliminarily combined through the hot-melt optical adhesive film.
After cold pressing, the laminating tightness of the display panel and the protection panel is improved under the action of pressure, the combination strength of the display panel, the protection panel and the hot-melt optical adhesive film is increased, the display panel, the protection panel and the hot-melt optical adhesive film form primary positioning, and later-stage defoaming and solidification are facilitated. In the cold pressing step, the adhesive film is not required to be heated and melted, the surfaces of the display panel and the protection panel can be quickly pressed, the tightness of the lamination of the display panel, the protection panel and the hot-melt optical adhesive film is enhanced, the pressing time of the display panel and the protection panel can be greatly shortened by adopting a quick pressing mode, and the laminating efficiency of the display screen is improved.
The bonding tightness of the display panel and the protection panel after cold pressing is improved, a certain mutual positioning effect is realized between the display panel and the protection panel to form a body to be solidified, and in the same way, in the pressurizing and defoaming process, the flatness and the bonding tightness between the display panel and the protection panel are improved by using pressure, and bubbles between the hot-melt optical adhesive film and the protection panel and between the hot-melt optical adhesive film and the display panel in the bonding process are discharged; the process does not need heating, saves the heating time, can adopt a quick pressing mode, and shortens the defoaming time and the laminating efficiency.
The bonding force of the display panel and the protection panel after pressurization and defoaming is further increased, the relative positions of the display panel and the protection panel are basically fixed, the body to be cured is cured, the cured hot-melt optical adhesive film is subjected to crosslinking reaction and is firmly bonded with the display panel and the protection panel, so that the display panel is fixedly connected with the protection panel, and the bonding of the display screen is completed.
The display screen attaching process in the embodiment of the invention is suitable for the flat display screens with medium and small sizes, and the flat display screens with medium and small sizes have small attaching area, do not have corner structures in the attaching area, are not easy to generate bubbles in the attaching process and have high attaching flatness. In the display screen laminating process, cold pressing and pressurization defoaming steps can adopt a quick pressing mode, heating is not required, the production time is greatly shortened, the hot-melt optical adhesive film cannot deform due to heating, the adhesive film rebounds, the laminating quality of the display screen is influenced, or glue overflowing is caused due to heating and melting, and in addition, the display panel is not damaged due to the influence of long-time heating, and the display effect in the later stage of the display screen is influenced.
It should be noted that the protection panel may be a glass panel, a plastic panel, or a functional panel with a touch function; the display panel can be a display module with a display light-emitting function, or a display module with a backlight function, or a display module with touch control and light-emitting functions; the display screen can be applied to intelligent equipment with playing and displaying functions, such as a mobile phone, a tablet personal computer, a portable computer, a television and the like. The hot-melt Optical Adhesive film can be a UV-curing type Optical transparent hot-melt Adhesive film or a thermosetting Optical Clear Adhesive film (TOCA), has high light transmittance and good ductility, can reduce the resilience of the Adhesive film and the warping deformation of materials, has strong self-adhesion, can be firmly adhered to the display panel and the protective panel, is convenient for being adhered and positioned with the display panel and the protective panel, and improves the adhesion stability of the display panel and the protective panel.
Referring to fig. 2, it should be noted that, a release film is usually attached to two sides of the hot-melt optical adhesive film to protect the adhesive film on the inner layer of the hot-melt optical adhesive film, and the release film has a certain elasticity and can be stretched to prevent the hot-melt optical adhesive film from rebounding during the process of attaching to the panel to cause the surface of the hot-melt optical adhesive film to form wrinkles. Therefore, before the attaching step is performed, the release film on the side of the hot-melt optical adhesive film is removed to expose the adhesive film, and the adhesive film is attached to the display panel or the protection panel. Specifically, the release film on the first side can be torn off, the exposed side of the adhesive film is attached to the protection panel, the release film on the second side is torn off, and the second side of the adhesive film is attached to the display panel, so that the display panel and the protection panel are attached to each other.
In addition, can roll press hot melt optical adhesive film when hot melt optical adhesive film is attached, namely, along with the glued membrane is constantly attached to display panel or protection panel, set up rolling press device (like rolling head, cylinder roller etc.) in glued membrane non-attached side and carry out synchronous roll extrusion to the glued membrane, with the air that constantly discharges to be located between glued membrane and the panel, make the glued membrane can smoothly attach in display panel or protection panel's surface, thereby improve the roughness of laminating between glued membrane and the panel, avoid appearing fold between glued membrane and the panel, the bubble, guarantee the laminating quality.
And in the attaching process, the air can be gradually blown to the adhesive film and/or the panel along the direction of the adhesive film attached to the panel, the air flow pushes the adhesive film to be continuously attached to the panel, and the air between the adhesive film and the panel is discharged in the attaching process, so that bubbles are prevented from being formed.
Before tearing off from the type membrane, perhaps before the glued membrane of second side is attached to the panel, carry out ultraviolet irradiation to hot melt optical adhesive film, realize the pre-consolidation to hot melt optical adhesive film, through the hot melt optical adhesive film of ultraviolet irradiation, receive its inside functional group energy and molecular structure's influence to contract, reduce the stress after the glued membrane is pasted, avoid the glued membrane cold pressing, pressurization deaeration in-process, when the tool lifts up, the edge rebound of glued membrane causes the display screen to warp, influences the laminating quality of display screen. In addition, after UV is precured, the glued membrane with from the type membrane to and the glued membrane improves with the bonding degree between the panel, be convenient for tear the type membrane on the glued membrane, thereby can avoid tearing the in-process from the type membrane, take the glued membrane from the panel, influence the laminating quality of display screen.
In the traditional process, the panel is subjected to a pressing effect in the hot pressing process, micro deformation can be generated, stress is generated in the panel, after the hot pressing is completed, the panel is warped and deformed due to stress release of the panel, and the defects of Newton rings, yellowing and black mirror lines exist after the display screen is attached are caused. According to the laminating process, heating and temperature rise are not needed in each laminating step, so that the defect that the adhesive film and the panel deform due to heating is overcome, the laminating quality of the display screen is improved, the temperature rise time and the time for continuously heating the panel and the adhesive film are saved, and the laminating efficiency of the display screen is obviously improved.
The cold pressing step has low requirement on temperature, does not need temperature adjustment, can be carried out in a room temperature environment, and has high production feasibility. In the step of cold pressing, the protection panel and the display panel are only subjected to slight pressing force to be tightly attached to each other, the attaching area of the protection panel and the display panel is closed, external water vapor or air is prevented from entering to form bubbles, the hot-melt optical adhesive film is tightly attached to the surfaces of the protection panel and the display panel, the relative position of the display panel and the protection panel is preliminarily fixed, and a body to be solidified is formed.
In the cold pressing step, the surface of the protection panel and/or the display panel can be pressed by the jig, so that the protection panel and the display panel are tightly attached to each other under the action of pressure. Specifically, one side of the body to be solidified, which is attached to the display panel, can be placed on a platform with a flat surface, the jig descends and is pressed on one side of the body to be solidified, which is attached to the protective panel, and the display panel is tightly pressed with the protective panel, so that the display panel is prevented from being directly damaged by the pressing force of the jig, and the attaching quality of the display screen is improved; of course, the jig and the platform can move relatively at the same time, so that the display panel and the protection panel are pressed and attached tightly at the same time, and the attaching efficiency of the display screen is improved.
The cold pressing step can be performed in a vacuum environment to prevent external air from entering the body to be cured and influencing the flatness of the fit of the body to be cured. The cold pressing step can be performed in a vacuum fast press, and the protection panel and the display panel are fast pressed in a vacuum environment, so that the display panel and the protection panel are better closed.
The pressure defoaming step can further discharge bubbles between the glue film and the panel, and the pressure defoaming step can be carried out in a defoaming device, so that the display panel and the protection panel are tightly attached by fast pressure, and the bubbles between the display panel and the protection panel are squeezed out. The step of pressure defoaming can be carried out in a vacuum environment, so that the defoaming process is not influenced by the external environment, and the defoaming effect is optimized.
It should be noted that, in the cold pressing and pressure defoaming processes, the jig is required to press the panels, in order to improve the joint flatness of the display panel and the protection panel, the panels can be blown in the pressing process of the jig panels, the blowing step and the pressing process of the jig are performed simultaneously, the blowing step adopts a mode of gradually blowing from the center of the panel to the side part of the panel, so that the central area of the panel firstly contacts with the jig and gradually extends to the edge area of the panel, and through the blowing mode, bubbles between the two panels can gradually move to the edge of the panel and finally be discharged, thereby further optimizing the bubble discharging effect in the cold pressing and pressure defoaming processes.
During and after the bonding process, the body to be cured can be detected. For example, after cold pressing or defoaming is completed, appearance detection and electrical property detection are performed on the display panel and the protection panel, the appearance detection mainly detects whether a joint of the display panel and the protection panel has an obvious non-joint part, a crack and an overflow phenomenon, and the electrical property detection mainly detects whether the display panel and the protection panel can normally display contents and whether a poor electrical connection part exists. If there is the laminating bad region, can tear the glued membrane between display panel and the protection panel and remove, make glued membrane and display panel, protection panel break away from, can carry out the adhesion to the glued membrane once more, and the aforesaid tears the process, does not damage the panel, and the simple operation, carries out prosthetic prerequisite to laminating quality under, has reduced the rejection rate.
If the poor bonding area does not exist in the detection, the body to be cured can be cured, and the curing step can adopt an ultraviolet curing or thermosetting mode to completely fix the display panel and the protection panel. It should be noted that, if the hot-melt optical adhesive film is pre-cured before final curing, the stress of the hot-melt optical adhesive film is released, so that the adhesive film and the panel are not deformed during subsequent curing, the display screen does not have newton rings, yellowing, and the like, and the adhesive force between the optical adhesive film and the display panel and between the optical adhesive film and the protection panel can be increased through multiple curing, so as to improve the bonding quality.
In addition, if the display panel or the protection panel has a wider ink shielding area, ultraviolet rays cannot irradiate all areas of the display panel and the protection panel, and areas which are not completely cured exist in the display screen, so that in order to further improve the curing effect, the ultraviolet curing device can assist in performing thermal curing after UV curing to supplement and cure the areas which are not completely cured between the two panels, improve the bonding strength between the display panel and the protection panel, and optimize the curing quality of the display screen. In the heating and curing process, a frame body which is suitable for the ink area of the protection panel and the frame size of the display panel can be adopted, and the frame body is heated and then directly pressed on the two panels to complete the heat curing process.
After the curing is completed, the display screen can be finally inspected to observe whether the joint of the display panel and the protection panel meets the joint standard, and unqualified products can be separated from the protection panel by freezing and adopting a solvent method and reworked. In the separation process, the panel can not be damaged, and the attaching cost and the rejection rate can be reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The medium and small size flat display screen attaching process is characterized by comprising the following steps:
attaching, namely respectively attaching a display panel and a protective panel to two sides of the hot-melt optical adhesive film;
cold pressing to form a body to be solidified;
carrying out pressure defoaming on the body to be solidified;
and curing the body to be cured.
2. The process of claim 1, wherein the step of attaching comprises removing a release film on a side of the hot-melt optical adhesive film and attaching the hot-melt optical adhesive film to the display panel or the protective panel.
3. The process of claim 1, wherein the step of cold pressing comprises pressing the protective panel and/or the display panel with a jig to close the hot-melt optical adhesive film to the display panel and the attachment area of the protective panel.
4. The process for attaching a small-to-medium sized flat display according to claim 1, wherein the cold pressing step is performed at room temperature.
5. The process for attaching a flat display screen with medium or small dimensions according to claim 1, wherein said cold pressing and/or said pressure defoaming step are carried out in a vacuum environment.
6. The process for attaching a medium-and small-sized flat display screen according to any one of claims 1 to 5, wherein the body to be cured is inspected or reworked after the pressure defoaming step.
7. The process for attaching a medium-small sized flat display screen according to any one of claims 1 to 5, wherein the body to be cured is subjected to ultraviolet curing.
8. The process for attaching a medium-small sized flat display screen according to any one of claims 1 to 5, wherein the body to be cured is thermally cured.
9. The process for attaching a medium-small sized flat display screen according to any one of claims 1 to 5, wherein the body to be cured is subjected to heat curing and ultraviolet curing.
10. The process for attaching a flat display screen with medium or small dimensions according to any of claims 1 to 5, wherein the curing step is followed by final inspection or rework.
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| Publication number | Publication date |
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| CN112700721B (en) | 2023-03-31 |
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