CN110667099A

CN110667099A - Laminating method and laminating device

Info

Publication number: CN110667099A
Application number: CN201910951007.4A
Authority: CN
Inventors: 强华; 刘荣交; 石林; 吕黎; 饶振华
Original assignee: KUNSHAN SAMON AUTOMATION TECHNOLOGY CO LTD
Current assignee: KUNSHAN SAMON AUTOMATION TECHNOLOGY CO LTD
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-01-10

Abstract

The invention belongs to the technical field of display and discloses a laminating method and a laminating device. According to the attaching method and the attaching device provided by the invention, the liquid optical cement arranged on one of the two parts of the attached display assembly in the vacuum environment can flow and spread around after contacting the other part, so that the bonding area of the two parts is gradually filled, the gas between the attaching surfaces of the two parts is thoroughly exhausted, and the liquid optical cement is prevented from remaining bubbles during flowing, so that a defoaming program required after the attaching operation of a conventional display assembly is omitted, the use requirement of the display assembly is directly met, the cost of the attaching operation is greatly reduced, and the efficiency of the attaching operation is improved.

Description

Laminating method and laminating device

Technical Field

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

Background

The display assembly generally includes a display screen, a touch screen, and a cover layer for protecting the display screen or the touch screen. In order to isolate dust and moisture between the display screen and the touch screen, between the touch screen and the covering layer and between the display screen and the covering layer (such as a display assembly without the touch screen), the components are required to be attached in a full-attaching mode.

Full lamination generally refers to filling a gap between two parts to be laminated with liquid optical cement. The conventional full-lamination method is to apply colloid on the lamination surface of the two laminated parts and then to compress the two parts. A large amount of bubbles are easy to remain between two attached parts in the attaching process by using the method, and the bubbles can be removed by a defoaming procedure subsequently, so that the use requirement of the display assembly is met, the attaching cost is greatly increased, and the attaching efficiency is reduced.

Disclosure of Invention

The invention aims to provide a bonding method and a bonding device, which aim to solve the problem that bubbles are easy to remain between two bonded parts in the full bonding process of the conventional display assembly.

To achieve the purpose, the invention provides the following technical scheme:

in one aspect, the present invention provides a bonding method for bonding a first substrate and a second substrate of a display module, where a bonding surface of the first substrate includes a first region, a bonding surface of the second substrate includes a second region, and a projection of the second region on the first substrate is located within the first region, the bonding method including:

arranging dam glue on the periphery of the first area, wherein the dam glue is provided with a notch;

arranging liquid optical cement in the second area;

and enabling the first area and the second area to be opposite, attaching the first substrate and the second substrate in a vacuum environment, and enabling the liquid optical cement to flow out of the notch after filling the first area.

Preferably, the liquid optical cement in the second region is a preset shape, and the sectional area of the preset shape decreases gradually from the end of the preset shape connected with the second substrate to the end of the preset shape departing from the bonding surface of the second substrate.

Preferably, the preset shape is a symmetrical shape with a symmetrical plane perpendicular to the bonding surface of the second substrate, and one end of the preset shape departing from the bonding surface of the second substrate is in a point shape or a linear shape.

Preferably, the liquid optical cement is disposed in a central region of the second region.

Preferably, the attaching method further includes: and calculating the volume of the preset body according to the design thickness of the liquid optical cement required to be arranged between the first substrate and the second substrate, wherein the volume of the preset body is larger than the product of the design thickness of the liquid optical cement required to be arranged between the first substrate and the second substrate and the area of the first region.

Preferably, the height of the dam paste is greater than the designed thickness of the liquid optical paste to be disposed between the first substrate and the second substrate.

Preferably, the dam adhesive is a rectangular frame, the notches are formed in the four corners of the rectangular frame and/or the notches are formed in the middle points of the sides of the rectangular frame.

Preferably, the first substrate is a display screen, and the second substrate is a touch screen or tempered glass.

On the other hand, the invention also provides the following technical scheme:

a laminating device is used for laminating a first substrate and a second substrate of a display assembly, wherein the laminating surface of the first substrate comprises a first area, the laminating surface of the second substrate comprises a second area, the projection of the second area on the first substrate is positioned in the first area, and the laminating device comprises:

the first coating mechanism is used for arranging dam glue on the periphery of the first area of the first substrate, and the dam glue is provided with a notch;

the second coating mechanism is used for arranging liquid optical cement in a second area of the second substrate;

and the vacuum laminating mechanism is used for aligning the first area of the first substrate with the second area of the second substrate and laminating the first area and the second area of the second substrate in a vacuum environment so as to enable the liquid optical cement to flow and fill the first area and then flow out of the notch.

Preferably, the bonding device further includes a curing mechanism, and the curing mechanism is configured to cure the liquid optical cement between the first substrate and the second substrate after bonding.

The invention has the beneficial effects that:

according to the attaching method and the attaching device provided by the invention, the liquid optical cement arranged on one of the two parts of the attached display assembly can flow and spread around after contacting the other part, so that the bonding area of the two parts is gradually filled, the gas between the attaching surfaces of the two parts is thoroughly exhausted, and the liquid optical cement is prevented from remaining bubbles during flowing, so that a defoaming program required after the attaching operation of a conventional display assembly is omitted, the use requirement of the display assembly is directly met, the cost of the attaching operation is greatly reduced, and the efficiency of the attaching operation is improved.

Drawings

FIG. 1 is a schematic diagram of a display module according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating a bonding method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a bonding method step S1 according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a bonding method step S2 according to an embodiment of the present invention;

FIG. 5 is a diagram illustrating a step S3 of a bonding method according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a flow state of the liquid optical cement in the bonding process in step S3 of the bonding method according to the embodiment of the invention.

In the figure:

100. a display component;

10. a first substrate; 20. a second substrate;

1. dam glue; 11. a notch; 2. and (3) liquid optical cement.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The embodiment provides a laminating method and a laminating device aiming at the problem that bubbles are easily left between two attached parts in the full attaching process of a display assembly in the prior art, so that the bubbles are prevented from being left between the two attached parts after attaching.

A first aspect of the present embodiment is to provide a bonding method for bonding the first substrate 10 and the second substrate 20 of the display module 100 shown in fig. 1. The bonding surface of the first substrate 10 includes a first region, which is a region where the first substrate 10 needs to be bonded to the second substrate 20, and the first region may be all or a part of the bonding surface of the first substrate 10 according to different designs and bonding requirements of products. The bonding surface of the second substrate 20 includes a second region, and a projection of the second region on the first substrate 10 is located within the first region, it is understood that the area of the second region is smaller than or equal to the first region, that is, the second region may also be all or a part of the bonding surface of the second substrate 20. Referring to fig. 2 to 6, the attaching method may specifically include:

step S1: referring to fig. 3, a dam adhesive 1 is disposed on a periphery of a first area of a first substrate 10, and the dam adhesive 1 is provided with a gap 11. That is, the dam paste 1 has an unclosed contour, and a portion thereof excluding the notch 11 is a continuous paste. Like the conventional way of setting up dam gum 1 among the existing laminating technique, dam gum 1 can select for use and can keep the sticky colloid material of the relatively stable form after coating to the binding face of first base plate 10.

Step S2: referring to fig. 4, a liquid optical adhesive 2 is disposed on a second region of the second substrate 20. Preferably, the liquid optical cement 2 may be configured to be a preset shape, and the preset shape may be a shape in which a sectional area of an end of the preset shape, which is connected to the attaching surface where the liquid optical cement 2 is disposed, gradually decreases to an end of the preset shape, which is away from the attaching surface. For example, in some alternative embodiments, the predetermined shape may be a cone/pyramid whose bottom surface is connected to the attaching surface of the second substrate 20, a triangular prism whose side surface is connected to the attaching surface of the second substrate 20, a hemisphere, a spherical cap, or the like. It should be noted that, the steps S2 and S1 are the same preparation steps for the subsequent bonding, and there is no inevitable order between them, that is, they may be performed either one after the other or simultaneously.

Step S3: referring to fig. 5, the first substrate 10 and the second substrate 20 are bonded in a vacuum environment, so that the liquid optical cement 2 on the second substrate 20 is connected to the bonding surface of the first substrate 10, and after the liquid optical cement 2 gradually flows to fill the first area of the first substrate 10, the liquid optical cement 2 flows to or out of all the gaps 11 of the dam cement 1.

Specifically, the bonding process of the first substrate 10 and the second substrate 20 is a process of filling the first region of the first substrate 10 and the region corresponding to the first region of the second substrate 20 with the liquid optical cement 2 disposed on the second substrate 20. The reason why the air bubbles remain between the first substrate 10 and the second substrate 20 during the bonding process generally lies in that the liquid optical cement 2, in the flowing process, encloses the gas together with the first substrate 10 and the second substrate 20 to make the gas stay in the liquid optical cement 2 and cannot be discharged, even if the vacuum device is operated under a vacuum condition, the vacuum device cannot necessarily make the working space of the vacuum device reach an absolute vacuum state, once the liquid optical cement 2 forms a cavity in the flowing process, the air bubbles are inevitably generated to affect the display effect of the display assembly 100. In the method provided in this embodiment, referring to fig. 6 (the direction indicated by the arrow in the figure is the gas discharging direction), taking the liquid optical adhesive 2 with a triangular prism shape disposed on the bonding surface of the second substrate 20 as an example, the bonding process can be specifically decomposed into the following processes:

first, the bonding surfaces of the first substrate 10 and the second substrate 20 move relatively in parallel, and the lowermost edge (i.e., the end thereof away from the bonding surface of the second substrate 20) of the liquid optical cement 2 disposed on the second substrate 20 contacts the first region of the first substrate 10, so that a linear cement is formed at the contact position (the first step in fig. 6).

Subsequently, the first substrate 10 and the second substrate 20 continue to move towards each other, the liquid optical cement 2 is squeezed and flows around, and the lowest edge of the liquid optical cement gradually flows from a line shape to an oval shape along the contact position with the second substrate 20 (the second step in fig. 6). The gas between the first substrate 10 and the second substrate 20 is driven away by the gradually diffused liquid optical cement 2, and no cavity is formed because the liquid optical cement 2 flows in a uniform divergent manner and no cross confluence occurs between the colloids.

Then, as the first substrate 10 and the second substrate 20 continue to move towards each other, the second substrate 20 contacts with the dam adhesive 1 disposed on the first substrate 10, so that the first substrate 10, the second substrate 20 and the dam adhesive 1 surround to form a bonding space for accommodating the liquid optical adhesive 2. The liquid optical cement 2 continues to be extruded, gradually flows and spreads to the inner side of the dam cement 1, is blocked by the dam cement 1, and continues to spread towards the gap 11 of the dam cement 1, which is communicated with the outside, of the bonding space, so that the first area of the first substrate 10 and the area of the second substrate 20 corresponding to the first area are gradually filled, and the gas in the bonding space is driven away through the gap 11 of the dam cement 1 (the third and fourth steps in fig. 6).

Finally, when the first substrate 10 and the second substrate 20 are pressed to a predetermined distance, the liquid optical adhesive 2 completely fills the first region of the first substrate 10 and fills the region corresponding to the first region of the second substrate 20, thereby completing the bonding operation between the first substrate 10 and the second substrate 20 (the fifth step in fig. 6).

By using the above bonding method, the gas can be exhausted completely during the bonding process of the first substrate 10 and the second substrate 20, and bubbles can be prevented from remaining between the bonded first substrate 10 and the bonded second substrate 20. Therefore, a defoaming program which is required to be carried out after the conventional display assembly 100 is attached is omitted, the use requirement of the display assembly 100 is directly met, the cost of the attaching operation is greatly reduced, and the efficiency of the attaching operation is improved. Specifically, the method may be used to attach the display screen to the touch screen, or attach the touch screen to the tempered glass, for example, the first substrate 10 may be the display screen, and the second substrate 20 may be the touch screen or the tempered glass. The method is also suitable for the operation of jointing the two plate-shaped bodies by using the water adhesive in other technical fields, such as the operation of adhering transparent or semitransparent decorations on the surface of the glass curtain wall and the like.

Experiments show that in the preparation step, the liquid optical cement 2 on the second substrate 20 is set to be a preset shape with a pointed top, and a better gas exhaust effect can be achieved if one end of the preset shape, which is away from the binding surface on which the liquid optical cement 2 is set, is set to be a point or a line. In addition, the predetermined shape may be a symmetrical shape having a symmetrical plane perpendicular to the attaching surface of the second substrate 20, or the liquid optical cement 2 on the second substrate 20 may be disposed in the central region of the first region. So that the liquid optical cement 2 can flow and disperse to the periphery of the first substrate 10 and the second substrate 20 integrally, the gas between the first substrate and the second substrate can be uniformly exhausted by the liquid optical cement 2 in the bonding process, and the phenomenon of colloid ripple or other bad phenomena influencing the bonding quality caused by the stagnation of one part of the colloid and the flowing of the other part of the colloid can not occur.

It is understood that the attaching method may further include calculating the volume of the predetermined shape according to the designed thickness of the liquid optical cement 2 to be disposed between the first substrate 10 and the second substrate 20 before the step of "disposing the liquid optical cement 2 in the predetermined shape in the second region of the second substrate 20 to calculate the filling amount". Specifically, the volume of the predetermined shape may be larger than the product of the designed thickness of the liquid optical cement 2 to be disposed between the first substrate 10 and the second substrate 20 and the area of the first region. Thereby, it is possible to make the liquid optical cement 2 more than the designed amount overflow from the notch 11, so that it can be intuitively determined that the liquid optical cement 2 has completely filled the area of the liquid optical cement 2 to be disposed between the first substrate 10 and the second substrate 20 after the bonding.

Further, in the step of "disposing the dam paste 1 at the periphery of the first area of the first substrate 10", the height of the dam paste 1 may be greater than the designed thickness of the liquid optical paste 2 to be disposed between the first substrate 10 and the second substrate 20. Therefore, before the liquid optical cement 2 flows to the dam cement 1, the dam cement 1 can be in contact with the second substrate 20 first, and then the joint space is enclosed by the dam cement 1 and the first substrate 10 and the second substrate 20 together, so that the flowing direction of the liquid optical cement 2 is limited, and gas can be smoothly discharged from the gap 11 to the joint space.

In a preferred embodiment, the dam adhesive 1 is a rectangular frame, and a gap 11 may be provided at the intersection of the sides of the first region of the dam adhesive 1, so that the gas at the corner of the bonding space surrounded by the first substrate 10, the second substrate 20 and the dam adhesive 1, which is retained at the intersection of the sides of the first region, can be exhausted from the gap 11 at the end stage of the bonding. In some other alternative embodiments, a notch 11 may be provided at the intersection of each side of the first area where the dam adhesive 1 is located and at the midpoint of each side of the first area where the dam adhesive 1 is located, so as to further ensure the exhaust of the gas. Specifically, the dam paste 1 may be provided in a circular shape or other shapes according to the shape of the display module to be actually attached.

On the other hand, the invention further provides a bonding apparatus of a display module 100, which is used for bonding a first substrate 10 and a second substrate 20 of the display module 100, wherein a bonding surface of the first substrate 10 includes a first region, a bonding surface of the second substrate 20 includes a second region, a projection of the second region on the first substrate 10 is located within the first region, and the bonding apparatus includes a first coating mechanism, a second coating mechanism and a vacuum bonding mechanism.

The first coating mechanism is used for arranging dam glue 1 on the periphery of a first area of a first substrate 10; the dam adhesive 1 comprises at least one notch 11 so that it has a non-closed contour. The second coating mechanism is used for arranging the liquid optical cement 2 in a preset shape in a second area of the second substrate 20, and the sectional area of the preset shape is gradually reduced from one end of the preset shape, which is connected with the binding surface provided with the liquid optical cement 2, to the other end of the preset shape, which is deviated from the binding surface. The vacuum bonding mechanism is used for bonding the first substrate 10 and the second substrate 20 in a vacuum environment, so that the liquid optical cement 2 on the second substrate 20 is connected with the bonding surface of the first substrate 10, and the liquid optical cement 2 gradually flows to fill the first area of the first substrate 10 and then flows out of the first area from all the gaps 11. The first coating mechanism and the second coating mechanism may include a slot coating die to be able to dispose the liquid optical cement 2 in a predetermined shape in the second region of the second substrate 20. The specific working process of the attaching device can refer to the attaching method.

In a preferred embodiment, the bonding apparatus may further include a glue removing mechanism and a curing mechanism, wherein the glue removing mechanism is configured to remove the liquid optical glue 2 flowing out of the first region, that is, the glue removing mechanism is configured to remove the excess liquid optical glue 2 overflowing from the gap 11 of the dam glue 1 after the bonding is completed. The curing mechanism is used for curing the liquid optical cement 2 between the first substrate 10 and the second substrate 20 after being bonded.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A bonding method for bonding a first substrate (10) and a second substrate (20) of a display module (100), wherein a bonding surface of the first substrate (10) includes a first region, and a bonding surface of the second substrate (20) includes a second region, a projection of the second region on the first substrate (10) is located within the first region, the bonding method comprising:

arranging dam rubber (1) on the periphery of the first area, wherein the dam rubber (1) is provided with a notch (11);

arranging a liquid optical cement (2) in the second area;

and enabling the first area and the second area to be opposite, attaching the first substrate (10) and the second substrate (20) in a vacuum environment, and enabling the liquid optical cement (2) to flow and fill the first area and then flow out of the gap (11).

2. The bonding method according to claim 1, wherein the liquid optical adhesive (2) disposed in the second region is a predetermined shape, and the predetermined shape has a cross-sectional area that gradually decreases from an end of the predetermined shape that is connected to the second substrate (20) to an end of the predetermined shape that is away from the bonding surface of the second substrate (20).

3. The bonding method according to claim 2, wherein the predetermined shape is a symmetrical shape having a symmetry plane perpendicular to the bonding surface of the second substrate (20), and an end of the predetermined shape facing away from the bonding surface of the second substrate (20) is in a dot shape or a line shape.

4. The bonding method according to claim 1, wherein the liquid optical glue (2) is disposed in a central region of the second region.

5. The attaching method according to claim 2, further comprising: calculating the volume of the preset shape according to the design thickness of the liquid optical cement (2) required to be arranged between the first substrate (10) and the second substrate (20), wherein the volume of the preset shape is larger than the product of the design thickness of the liquid optical cement (2) required to be arranged between the first substrate (10) and the second substrate (20) and the area of the first region.

6. The bonding method according to claim 1, wherein the dam paste (1) has a height greater than a designed thickness of a liquid optical paste (2) to be disposed between the first substrate (10) and the second substrate (20).

7. The attaching method according to claim 1, characterized in that: dam is glued (1) and is the rectangle frame, the four corners of rectangle frame have seted up breach (11) and/or the mid point department on each side of rectangle frame has seted up breach (11).

8. The bonding method according to claim 1, wherein the first substrate (10) is a display screen and the second substrate (20) is a touch screen or tempered glass.

9. A bonding apparatus for bonding a first substrate (10) and a second substrate (20) of a display module (100), wherein a bonding surface of the first substrate (10) includes a first region, a bonding surface of the second substrate (20) includes a second region, and a projection of the second region onto the first substrate (10) is located within the first region, the bonding apparatus comprising:

the first coating mechanism is used for arranging dam glue (1) on the periphery of a first area of the first substrate (10), and the dam glue (1) is provided with a notch (11);

a second coating mechanism for disposing a liquid optical cement (2) in a second region of the second substrate (20);

and the vacuum attaching mechanism is used for aligning the first area of the first substrate (10) and the second area of the second substrate (20) and attaching the first area and the second area under a vacuum environment so that the liquid optical cement (2) flows out of the gap (11) after filling the first area in a flowing manner.

10. The bonding apparatus according to claim 9, further comprising a curing mechanism for curing the liquid optical cement (2) between the first substrate (10) and the second substrate (20) after bonding.