Disassembling method for display screen and shell

Abstract

The invention discloses a disassembling method of a display screen and a shell, the display screen and the shell are bonded through an adhesive film, and the adhesive film comprises a first bonding part arranged at a first bonding area and a second bonding part arranged at a second bonding area. The disassembling method of the display screen and the shell comprises the following steps that a first bonding part is powered on or subjected to laser irradiation, so that the first bonding part is unbonded, and an initial position used for separating the display screen from the shell is formed in a first bonding area; and heating and softening the second bonding part, and applying an external force from the initial position to completely separate the display screen from the shell. According to the disassembling method for the display screen and the shell, the probability that the display screen is damaged in the disassembling process can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic device disassembly, and in particular relates to a method for disassembling a display screen and a shell. Background Art

[0002] With the continuous development of the manufacturing industry and market trend surveys, OLED displays are completely replacing LCD displays and becoming a general trend. This trend is not only due to the visual advantages of OLED displays, but also due to the changing consumer demand for displays. While OLED has become the mainstream and brought consumers a better experience, product design also tends to be narrow-bordered and high-difficulty. Such narrow-bordered and high-difficulty designs will undoubtedly bring great challenges to future after-sales issues.

[0003] At present, VHB double-sided tape (i.e., VHB foam double-sided tape) is generally used to bond display screens and shells on the market. The traditional method for disassembling and repairing tablet or mobile phone LCD display screens is to heat the VHB double-sided tape on the four sides of the shell to soften the double-sided tape on the four sides of the shell (without debonding). After the VHB double-sided tape is softened, and under the action of external force, the four sides of the shell and the display screen can move slightly relative to each other to form a gap. A plastic card is used to insert it into the heated gap and destroy the glue layer there. Continue to apply force until the four sides of the gap and the display screen are completely separated (the above process can be called the starting process). After the plastic card is successfully inserted into the gap, the card is gently shaken along the gap and pushed forward until the display screen and the shell are completely separated. Because the internal structure of the OLED display module is more complicated than that of the LCD, in the method of using heating to soften the four sides of the shell to find a gap for inserting the card, when starting, since the VHB double-sided tape is only softened but not debonded, the starting process may cause risks such as damage to the OLED display and internal modules. That is, the traditional method of debonding the display and the shell is prone to damage to the display.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] An object of the present invention is to provide a method for disassembling a display screen and a housing, which can reduce the probability of damage to the display screen during the disassembly process.

[0006] In order to achieve the above-mentioned object, a technical solution provided by a specific embodiment of the present invention is as follows: a method for disassembling a display screen and a housing, wherein the display screen and the housing are bonded by an adhesive film, the adhesive film includes a first adhesive portion provided at a first adhesive region and a second adhesive portion provided at a second adhesive region, and the method for disassembling the display screen and the housing includes the following steps:

[0007] The first bonding portion is energized or irradiated with laser to debond the first bonding portion, and a starting position for separating the display screen and the housing is formed in the first bonding area;

[0008] The second bonding portion is heated and softened, and an external force is applied from the starting position to completely separate the display screen from the housing.

[0009] In one or more embodiments of the present invention, the first adhesive portion is an electrolytic adhesive film, and the first adhesive portion is debonded by applying electricity to the first adhesive portion.

[0010] In one or more embodiments of the present invention, the voltage for electrifying the first bonding portion is 10 to 30 V, and the electrification time is 10 to 30 seconds.

[0011] In one or more embodiments of the present invention, the first bonding portion is a thermoplastic HAF adhesive film, and the first bonding portion is irradiated with laser to debond the first bonding portion.

[0012] In one or more embodiments of the present invention, the power of laser irradiation on the first bonding portion is 10 to 30 W, and the irradiation time is 10 to 50 s.

[0013] In one or more embodiments of the present invention, the first bonding area is located at a corner of the display screen and the housing.

[0014] In one or more embodiments of the present invention, the second bonding portion is a VHB foam double-sided adhesive film.

[0015] In one or more embodiments of the present invention, in the step of heating and softening the second bonding portion, the heating temperature is 70 to 90° C. and the heating time is 3 to 5 minutes.

[0016] In one or more embodiments of the present invention, the step of applying an external force from the starting position to completely separate the display screen from the housing includes:

[0017] Use an auxiliary piece to insert between the display screen and the housing from the starting position, and separate the display screen and the housing.

[0018] In one or more embodiments of the present invention, the step of applying an external force from the starting position to completely separate the display screen from the housing further includes:

[0019] After the auxiliary piece is inserted from the starting position, the auxiliary piece gradually separates the display screen and the housing along the extending direction of the first bonding portion and the second bonding portion.

[0020] Compared with the prior art, the method for disassembling a display screen and a shell of the present invention debonds a first bonding portion by energizing or irradiating a bonding portion with a laser, thereby forming a starting position for separating the display screen and the shell in the first bonding area, thereby quickly and accurately determining the starting position, completely separating the display screen and the shell from the starting position, and reducing the probability of damage to the display screen during the disassembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The figure is a flow chart of a method for disassembling a display screen and a housing in an example of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] As mentioned in the background technology, the LCD display screen and the shell in the existing electronic device are bonded together by a foam double-sided tape (film). The conventional foam double-sided tape (such as VHB foam double-sided film) can be softened by heating, and then the loose position between the display screen and the shell is found (equivalent to the starting position in the disassembly method of the display screen and the shell of the present invention, which can also be called the starting position), and then the auxiliary part is inserted into this position, and the auxiliary part is gradually moved along the extension direction of the foam double-sided tape until the display screen and the shell are completely separated.

[0025] The process of inserting the auxiliary piece into the starting position, forcibly destroying the foam double-sided tape and separating the display screen and the shell at the starting position can be called a starting process.

[0026] For electronic devices using OLED displays or more sophisticated screens, when the auxiliary part is just inserted between the display and the shell during the starting process, the angle between the auxiliary part and the display or shell is relatively large, and the auxiliary part will use the contact point with the shell as a fulcrum to pry the display, thereby separating the display and the shell at the starting position. Since the foam double-sided tape is only softened after being heated, it does not lose its adhesion and still has a certain adhesive force. Therefore, during the prying process, the auxiliary part applies a large force to the display and the shell, which can easily cause damage to the internal components of the electronic device and / or the OLED display or more sophisticated screen. When the starting process is completed, the auxiliary part has been inserted between the shell and the display from the starting position, and in the process of the auxiliary part destroying the remaining adhesive film (i.e. continuing to separate the display and the shell), the auxiliary part's force direction is almost parallel to the shell and the display, that is, the auxiliary part applies a small force to the display and the shell, which is not easy to cause damage to the internal components of the electronic device and / or the OLED display or more sophisticated screen. Therefore, when the display screen is separated from the shell, due to the ultra-thin and lightweight design of the OLED display screen or a more sophisticated screen and the increasingly complex internal structure, the initial process is prone to damage to the internal components of the electronic device and / or the OLED display screen or a more sophisticated screen.

[0027] like Figure 1 As shown, in an example of the present invention, a method for disassembling a display screen and a housing is provided. The display screen and the housing of the electronic device are bonded to each other by an adhesive film. The display screen and the housing are bonded to each other by an adhesive film. The adhesive film includes a first adhesive portion provided at a first adhesive region and a second adhesive portion provided at a second adhesive region. The method for disassembling the display screen and the housing includes the following steps:

[0028] S1, applying electricity or laser irradiation to the first bonding portion to debond the first bonding portion, and forming a starting position for separating the display screen and the housing in the first bonding area;

[0029] S2, heating and softening the second bonding portion, and applying external force from the starting position to completely separate the display screen from the housing.

[0030] It should be noted that the adhesive film of the present invention includes a first adhesive portion and a second adhesive portion, and the first adhesive portion is an electrolytic adhesive film or a thermoplastic HAF adhesive film. It is configured in this way, that is, only the first adhesive portion at the first adhesive area is debonded (also called debonding) by means of power-on or laser irradiation, so as to quickly determine the starting position for separating the display screen and the shell. The means of power-on (when the first adhesive portion is an electrolytic adhesive film) or laser irradiation (when the first adhesive portion is a photodegradable adhesive film) can specify the area, thereby avoiding damage to the internal components and display screen of the electronic device.

[0031] It is understandable that debonding the first bonding portion can be considered as completely debonding the first bonding portion or almost completely debonding the first bonding portion, that is, the bonding force of the first bonding portion after debonding is considered to be 0 or approximately equal to 0 (much smaller than the bonding force of the conventional foam double-sided tape after being heated and softened), thereby forming a starting position for separating the display screen and the shell in the first bonding area. Almost complete debonding can be considered as the bonding force of the first bonding portion is very small, and the starting position of the display screen and the shell can be determined by slightly applying external force or shaking. For example, an obvious gap appears between the display screen and the shell at the first bonding area, or the original gap between the display screen and the shell at the first bonding area becomes larger, so that the gap can be determined as the starting position for separating the display screen and the shell, and then an external force is applied from the starting position to completely separate the display screen from the shell. In the starting process, only a small force is required to separate the display screen and the shell at the starting position, thereby avoiding damage to the display screen or other components during the starting process, and then completely separating the display screen from the shell.

[0032] The electronic device may be a mobile phone, a tablet computer, etc., and the display screen may be an OLED display screen or other display screens.

[0033] In a specific example, the first adhesive portion is an electrolytic adhesive film, and the first adhesive portion is energized to debond the first adhesive portion. For example, the electrolytic adhesive film may be SG 80306E of Singleton (Suzhou) Electronic Technology Co., Ltd. or other types of electrolytic adhesive films.

[0034] Preferably, the voltage for electrifying the first bonding portion is 10 to 30 V, and the electrification time is 10 to 30 seconds. The electrification time and voltage can be adjusted according to the type of electrolytic adhesive film without damaging the components inside the electronic device.

[0035] In a specific example, the first bonding portion is a thermoplastic HAF adhesive film, and the first bonding portion is irradiated with a laser to debond the first bonding portion. For example, the thermoplastic HAF adhesive film may be TL5010 produced by Singleton (Suzhou) Electronic Technology Co., Ltd.

[0036] Preferably, the power of the laser irradiation on the first bonding portion is 10 to 30 W, and the irradiation time is 10 to 50 s.

[0037] In a specific example, the first bonding area is located at the corner of the display screen and the shell. Such a setting can facilitate the application of external force to the starting position during subsequent operations, that is, after the external force is applied from the starting position (that is, the corner) to separate the display screen and the shell. Since the display screen is generally rectangular, after the display screen and the shell at the corner are separated, the parts located on the two sides of the corner are easier to separate, thereby reducing the probability of damage to the display screen during the process.

[0038] Specifically, the step of applying an external force from the starting position to completely separate the display screen from the housing includes: inserting an auxiliary member between the display screen and the housing from the starting position, and separating the display screen from the housing. The auxiliary member can be inserted into the gap between the display screen and the housing at the starting position. When inserting the auxiliary member into the gap, keep the force moderate to avoid excessive force that may cause the display screen to break.

[0039] Specifically, the auxiliary member may be in the form of a sheet.

[0040] Furthermore, the step of applying an external force from the starting position to completely separate the display screen from the housing further includes: after the auxiliary member is inserted from the starting position, the auxiliary member gradually separates the display screen from the housing along the extending direction of the first adhesive portion and the second adhesive portion. After the auxiliary member is successfully inserted into the gap, the auxiliary member is gently shaken and pushed forward along the gap (i.e., along the extending direction of the first adhesive portion and the second adhesive portion) until the display screen is completely separated from the housing.

[0041] In a specific example, the second bonding portion is a VHB foam double-sided adhesive film. Specifically, the VHB foam double-sided adhesive may be 3M5915 produced by Minnesota Mining Company, Ltd.

[0042] In a specific example, in the step of heating and softening the second bonding portion, the heating temperature is 70 to 90° C. and the heating time is 3 to 5 minutes.

[0043] The method for disassembling a display screen and a housing of the present invention will be described in detail below in conjunction with specific embodiments and comparative examples.

[0044] Example 1

[0045] Taking a mobile phone as an example, the adhesive film between the display screen and the shell includes a first adhesive portion (electrolytic adhesive film SG 80306E) arranged at the first adhesive area and a second adhesive portion (VHB foam double-sided adhesive film 3M5915) arranged at the second adhesive area, wherein the thickness of the adhesive film is 0.4 mm.

[0046] The first bonding portion at the first bonding area is energized with a voltage of 30V for 10 seconds, and then a starting position for separating the display screen and the housing can be determined at the first bonding area.

[0047] Heat the second bonding part at the second bonding area (heating temperature is 80°C, heating time is 4 minutes) to soften it, use an auxiliary part to insert into the starting position for separating the display screen and the shell and gently pry to separate the display screen and the shell at the starting position, and the auxiliary part is located between the display screen and the shell. After the auxiliary part is inserted, slowly shake the auxiliary part left and right along the starting position and push it forward to destroy the softened second bonding part and gradually expand the disassembly range until the display screen and the shell are completely separated.

[0048] Example 2

[0049] The technology is mostly the same as that of Example 1, except that during the process of energizing the first bonding portion at the first bonding area, the energizing voltage is 20V and the energizing time is 10s.

[0050] Example 3

[0051] The technology is mostly the same as that of Example 1, except that during the process of energizing the first bonding portion at the first bonding area, the energizing voltage is 10V and the energizing time is 10s.

[0052] Example 4

[0053] The technology is mostly the same as that of Example 1, except that during the process of energizing the first bonding portion at the first bonding area, the energizing voltage is 10V and the energizing time is 15s.

[0054] Example 5

[0055] The technology is mostly the same as that of Example 1, except that during the process of energizing the first bonding portion at the first bonding area, the energizing voltage is 10V and the energizing time is 20s.

[0056] Example 6

[0057] The technology is mostly the same as that of Example 1, except that during the process of energizing the first bonding portion at the first bonding area, the energizing voltage is 10V and the energizing time is 30s.

[0058] In the process of Examples 1 to 6, the pulling force after power-on and the damage condition of the display screen after the display screen and the housing are completely separated are shown in Table 1 below:

[0059] Table 1: Pull-out force data and display screen damage conditions of Examples 1 to 6

[0060] Pull-out force after power on (MPa) Damage to the display Example 1 0.05 intact Example 2 0.06 intact Example 3 0.06 intact Example 4 0.06 intact Example 5 0.06 intact Example 6 0.06 intact

[0061] It can be seen from the data of Examples 1 to 6 in Table 1 that: in the three groups of data of Examples 1 to 3, when the power-on time is constant, there is almost no difference in the debonding effect of the power-on voltages of 30V, 20V, and 10V; in the three groups of data of Examples 3 to 6, when the power-on voltage is consistent, there is no difference in the debonding effect of the power-on time of 10s, 15s, 20s, and 30s, and the display screen is intact after debonding. However, considering that the human safety voltage shall not exceed 36V, and the disassembly efficiency, when the above parameters can be met, a power-on voltage of 10V and a power-on time of 10S are more appropriate.

[0062] Example 7

[0063] Taking a mobile phone as an example, the adhesive film between the display screen and the shell includes a first adhesive portion (thermoplastic HAF adhesive film TL5010) arranged at the first adhesive area and a second adhesive portion (VHB foam double-sided adhesive film 3M5915) arranged at the second adhesive area, wherein the thickness of the adhesive film is 0.4 mm.

[0064] The first bonding portion at the first bonding area is irradiated with laser, the power of the laser irradiation is 10 W, and the laser irradiation time is 30 seconds. Then, the starting position for separating the display screen and the housing can be determined in the first bonding area.

[0065] Heat the second bonding part at the second bonding area (heating temperature is 80°C, heating time is 4 minutes) to soften it, use an auxiliary part to insert into the starting position for separating the display screen and the shell and gently pry to separate the display screen and the shell at the starting position, and the auxiliary part is located between the display screen and the shell. After the auxiliary part is inserted, slowly shake the auxiliary part left and right along the starting position and push it forward to destroy the softened second bonding part and gradually expand the disassembly range until the display screen and the shell are completely separated.

[0066] Example 8

[0067] The technology is mostly the same as that of Example 12, with the only difference being that during the laser irradiation process of the first bonding portion at the first bonding area, the laser irradiation power is 20 W and the laser irradiation time is 30 s.

[0068] Example 9

[0069] The technology is mostly the same as that of Example 12, with the only difference being that during the laser irradiation process of the first bonding portion at the first bonding area, the laser irradiation power is 30 W and the laser irradiation time is 30 s.

[0070] Example 10

[0071] The technology is mostly the same as that of Example 12, with the only difference being that during the laser irradiation process of the first bonding portion at the first bonding area, the laser irradiation power is 20 W and the laser irradiation time is 10 s.

[0072] Embodiment 11

[0073] The technology is mostly the same as that of Example 12, with the only difference being that during the laser irradiation process of the first bonding portion at the first bonding area, the laser irradiation power is 20 W and the laser irradiation time is 50 s.

[0074] In Examples 7 to 11, the pull-out force after laser irradiation and the damage condition of the display screen after the display screen and the housing are completely separated are shown in Table 2 below:

[0075] Table 2: Pull-out force data and display screen damage conditions of Examples 7 to 11

[0076]

[0077] It can be seen from the data of Examples 7 to 11 in Table 2 that: when the time is constant, the powers are 10W, 20W, and 30W respectively, and there is no difference in the display screen damage effect after debonding. However, when the power is too high, it is easy to cause damage to the internal components of the mobile phone. If the power is too small, there will be a risk of incomplete debonding, so multiple laser irradiations are required, which is easy to cause internal damage to the mobile phone; when the power is constant, the time is 10s, 30s, and 50s respectively, and there is no difference in the display screen damage effect after debonding. However, considering that the time is too short, there may be a risk of incomplete debonding, and multiple laser irradiations are required, resulting in a long disassembly time, resulting in reduced disassembly efficiency. Too long time will also easily cause damage to the internal components of the mobile phone. Therefore, considering comprehensively that a power of 20W and a time of 30s are the best parameters.

[0078] In summary, the method for disassembling a display screen and a shell of the present invention selects different types of glue for the first adhesive portion and the second adhesive portion of the adhesive film (that is, the first adhesive portion selects an adhesive film that can be debonded under power or laser irradiation), and uses power or laser irradiation to debond the first adhesive portion first, thereby reducing the force applied to the display screen during the starting process, thereby more quickly and efficiently solving the problem of difficulty in determining the starting position and easy damage to the screen or other electronic devices during the starting process, and can also increase the disassembly rate and reduce the risk of disassembly damage.

[0079] In addition, when the first adhesive part is an electrolytic adhesive film and the second adhesive part is a conventional foam double-sided adhesive (such as a conventional VHB foam double-sided adhesive film), it can have the advantages of high disassembly rate, low risk of disassembly damage, and low adhesive film cost.

[0080] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0081] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for disassembling a display screen and a housing, wherein the display screen and the housing are bonded together by an adhesive film, wherein the adhesive film comprises a first adhesive portion disposed at a first adhesive region and a second adhesive portion disposed at a second adhesive region, wherein: The method for disassembling the display screen and the housing comprises the following steps: The first bonding portion is energized or irradiated with laser to debond the first bonding portion, and a starting position for separating the display screen and the housing is formed in the first bonding area; The second bonding portion is heated and softened, and an external force is applied from the starting position to completely separate the display screen from the housing.

2. The method for disassembling a display screen and a housing according to claim 1, characterized in that: The first adhesive portion is an electrolytic adhesive film, and electricity is applied to the first adhesive portion to debond the first adhesive portion.

3. The method for disassembling a display screen and a housing according to claim 2, characterized in that: The voltage for electrifying the first bonding portion is 10 to 30 V, and the electrification time is 10 to 30 seconds.

4. The method for disassembling a display screen and a housing according to claim 1, characterized in that: The first bonding portion is a thermoplastic HAF adhesive film, and the first bonding portion is irradiated with laser to debond the first bonding portion.

5. The method for disassembling a display screen and a housing according to claim 4, characterized in that: The power of the laser irradiation on the first bonding part is 10 to 30 W, and the irradiation time is 10 to 50 seconds.

6. The method for disassembling a display screen and a housing according to claim 1, characterized in that: The first bonding area is located at a corner of the display screen and the housing.

7. The method for disassembling a display screen and a housing according to claim 1, characterized in that: The second bonding portion is a VHB foam double-sided adhesive film.

8. The method for disassembling a display screen and a housing according to claim 1, characterized in that: In the step of heating and softening the second bonding portion, the heating temperature is 70 to 90° C. and the heating time is 3 to 5 minutes.

9. The method for disassembling a display screen and a housing according to claim 1, characterized in that: The step of applying an external force from a starting position to completely separate the display screen from the housing comprises: Use an auxiliary piece to insert between the display screen and the housing from the starting position, and separate the display screen and the housing.

10. The method for disassembling a display screen and a housing according to claim 9, characterized in that: The step of applying an external force from the starting position to completely separate the display screen from the housing also includes: After the auxiliary piece is inserted from the starting position, the auxiliary piece gradually separates the display screen and the housing along the extending direction of the first bonding portion and the second bonding portion.

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