CN115383328A

CN115383328A - Disassembling method of full-lamination display screen

Info

Publication number: CN115383328A
Application number: CN202211214113.2A
Authority: CN
Inventors: 吕志永
Original assignee: Shenzhen Augster Technology Co ltd
Current assignee: Shenzhen Augster Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-11-25

Abstract

The application relates to a disassembling method of a full-lamination display screen, which comprises the following steps: s1, placing a display screen on a workbench, and enabling one side of a cover plate of the display screen to be upward; s2, placing cooling liquid below one side of a display module of the display screen; s3, adopting a mobile device to load a matched laser device, and setting optical and laser parameters; s4, irradiating OCA optical cement between a cover plate of the display screen and the display module by using laser; s5, separating a cover plate of the display screen from the display module after the laser processing is finished; the liquid level of the cooling liquid in the S2 is higher than the bottom surface of the display module; the diameter of the laser spot in S4 is less than the thickness of OCA optical cement between the cover plate and the display module. The disassembling method of the full-lamination display screen is convenient for separation of the cover plate and the display module, damage to the cover plate, the display module and part of parts can be avoided, the loss rate of the full-lamination display screen disassembling process can be effectively reduced, and the economic benefit is high.

Description

Disassembling method of full-lamination display screen

Technical Field

The application relates to the technical field of liquid crystal display equipment disassembly, in particular to a disassembly method of a full-lamination display screen

Background

The OCA optical adhesive is prepared by preparing an optical acrylic adhesive into a non-base material, and then respectively attaching a layer of release film to the upper bottom layer and the lower bottom layer, is a double-sided adhesive tape without a base material and a head, has light transmittance of over 90 percent, has good adhesive strength, and can be cured at room temperature or intermediate temperature. It is as the adhesive that liquid crystal display equipment is used commonly, and the material bonding in the present mainly used display equipment bonds apron and display module assembly through OCA optical cement, and the full laminating screen of constitution also has huge promotion in thickness attenuate.

In the full laminating process, if foreign matters such as dust are contaminated or the display screen is used for a long time, bubbles are generated at the position of the OCA optical cement, so that the selling or using experience is very easily influenced. At this point, the fully-laminated display screen needs to be disassembled.

At present, the disassembling modes for the full-lamination display screen mainly comprise the following two modes:

(1) Freezing is also one of the most used methods at present. By placing the fully-laminated display screen in an environment at-130 ℃ for about 10min, the OCA optical cement between the cover plate and the display module can be rapidly cooled and solidified, so that the physical viscosity is lost, and the display screen is automatically separated. Due to integral cooling, other solid devices are easy to burst at extremely low temperature, and in addition, if the worker holds the separating force of the cover plate and the display module in the disassembling process, the display screen is often damaged.

(2) The hot tearing method is characterized in that a fully-laminated display screen is placed on the heating plate, and the IC module exists on the display module, so that the tolerance temperature of the fully-laminated display screen is 80 ℃ at most, the heating temperature of the fully-laminated display screen is lower than 80 ℃, at the moment, the OCA optical cement is in a jelly shape, and the glass cover plate and the display module can be separated by cutting the fully-laminated display screen through the filiform metal. However, since the melting point of the OCA optical cement is between 65 ℃ and 135 ℃, part of the OCA optical cement is not melted during heating. On the whole, the operation process of the hot-dismantling method is complicated, and the labor cost is too high.

Therefore, in order to avoid the similar situations, the application provides a disassembling method of the full-lamination display screen.

Disclosure of Invention

In order to improve the clearance process of OCA optical cement between apron and the display module assembly, reduce the damage of apron, display module assembly and partial spare part, this application provides a disassembly method of full laminating display screen.

The application provides a disassembling method of a full-lamination display screen, which comprises the following steps:

s1, placing a display screen on a workbench, and enabling one side of a cover plate of the display screen to face upwards;

s2, placing cooling liquid below one side of a display module of the display screen;

s3, adopting a mobile device to load a matched laser device, and setting optical and laser parameters;

s4, irradiating OCA optical cement between a cover plate of the display screen and the display module by using laser;

s5, separating a cover plate of the display screen from the display module after the laser processing is finished;

the liquid level of the cooling liquid in the S2 is higher than the bottom surface of the display module;

and the diameter of the laser spot in the S4 is smaller than the thickness of OCA optical cement between the cover plate and the display module.

By adopting the technical scheme, the OCA optical cement between the cover plate and the display module is cut by utilizing laser, one side where the display module is located is always located in the cooling liquid in the cutting process, heat conducted to the display module by cutting is transferred to the cooling liquid, and the temperature of one side of the display module in the cutting process is reduced, so that the damage of the display module caused by overhigh temperature in the cutting process is avoided; s4, the diameter of the laser spot is smaller than the thickness of the OCA optical cement between the cover plate and the display module, so that when the OCA optical cement is cut by laser, the laser is prevented from being in direct contact with the cover plate and the display module, and damage to the cover plate and the display module is reduced; make OCA optical cement can be in molten state completely simultaneously, be convenient for separate apron and display module assembly.

Preferably, in S2, the liquid level of the cooling liquid is higher than the top surface of the display module, so that the display module is immersed in the cooling liquid.

By adopting the technical scheme, the cooling liquid submerges the display module, so that the heat of the display module can be maximally led out, and the temperature of the display module is effectively controlled; can play the guard action to display module assembly again, prevent at laser cutting OCA optical cement in-process, laser and display module assembly direct contact cause the damage. In addition, OCA optical cement melts the back, can directly fall into to the coolant liquid to reduce the residue on the display module assembly.

Preferably, in S2, the cooling liquid is purified water.

Through adopting above-mentioned technical scheme, the pure water does not take place the reaction with display module assembly, OCA optical cement, and stability is good to specific heat capacity is higher, and the heat that can absorb is many, and coefficient of thermal conductivity is high, can derive the heat from display module assembly fast, reduces at the laser cutting in-process, display module assembly's temperature.

Preferably, in S2, the cooling liquid is in a circulating state.

By adopting the technical scheme, heat generated by laser cutting can be quickly taken away by circulating cooling liquid, so that the influence of overhigh local temperature on the later use of the display module is avoided; simultaneously can take away the OCA optical cement after the melting, avoid the OCA optical cement after the melting deposit on display module assembly, influence the full laminating process of display module assembly secondary.

Preferably, in S3, the moving device is selected from a moving platform or a mechanical handheld device.

Through adopting above-mentioned technical scheme, mobile device loads supporting laser device, can make to beat the facula orbit on OCA optical cement and form a straight line, avoids among the heat transfer process energy maldistribution to lead to apron and/or display module assembly and partial zero device to receive the damage, is favorable to separating apron and display module assembly simultaneously.

Preferably, in the method for disassembling the fully-bonded display screen, in S3, the moving speed of the moving device is 10 to 20mm/S.

By adopting the technical scheme, the laser cutting speed is controlled at a higher level, and the cutting efficiency is improved; and meanwhile, the laser cutting speed is controlled, and the heat generated in the cutting process is reduced, so that the influence of the laser cutting process on the display module is reduced.

Preferably, in S3, the matched laser device includes a laser emitting device and a laser head; the laser emitting device is selected from one of a fiber laser, a semiconductor laser and a YAG laser.

Through adopting above-mentioned technical scheme, utilize laser head cooperation laser emitter, launch the facula that the action scope is reasonable, make the facula can realize the accurate cutting to OCA optical cement. Meanwhile, the selected fiber laser has longer fluorescence life, can effectively store energy to realize high-power operation, and can ensure that the total electro-optical efficiency reaches 25 percent as commercial energy, thereby being beneficial to reducing the cost, saving energy and protecting environment; the selected semiconductor laser has the advantages of small volume, long service life and the like, can adopt a pumping mode of simply injecting current, and can directly carry out current modulation by using the frequency up to GHz so as to obtain high-speed modulated laser output; the YAG laser is used as a laser matrix with excellent comprehensive performance, and has low threshold value, long warning service life and very high fluorescence quantum efficiency.

Preferably, in the S3 laser parameters, the wavelength is set to be 980-1030nm.

By adopting the technical scheme, the laser with the wavelength of 980-1030nm is selected, so that the loss of energy in the transmission process can be reduced, the laser emission can be in a higher frequency state, and the cutting efficiency of the OCA optical cement can be effectively improved.

Preferably, in the S3 optical parameters, the spot diameter is set to be 1/3-2/3 of the thickness of the OCA optical cement.

Through adopting above-mentioned technical scheme, set up the facula diameter into 1/3 ~ 1/2 of OCA optical cement thickness, make laser can cut OCA optical cement completely at the removal in-process and open, keep the distance between laser beam and apron, the display module assembly simultaneously to reduce the influence of the heat that the cutting produced to the display module assembly.

Preferably, the method for disassembling the fully-fitted display screen further comprises the following steps: s6, cleaning the cover plate and/or the residual OCA optical cement on the display module.

Through adopting above-mentioned technical scheme, after the clearance remains to glue, when carrying out the secondary and laminating entirely, the uneven phenomenon of liquid crystal display equipment thickness can not appear, also can make display device have good display effect simultaneously.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the OCA optical cement between the cover plate and the display module is cut by utilizing laser, in the cutting process, one side where the display module is located is always located in cooling liquid, heat conducted to the display module by cutting is transferred to the cooling liquid, the temperature of one side of the display module in the cutting process is reduced, and therefore damage to the display module due to overhigh temperature in the cutting process is avoided; the diameter of the laser spot is set to be smaller than the thickness of the OCA optical cement between the cover plate and the display module, so that when the OCA optical cement is cut by laser, the laser is prevented from being in direct contact with the cover plate and the display module, and the damage to the cover plate and the display module is reduced; make OCA optical cement can be in molten state completely simultaneously, be convenient for separate apron and display module assembly.

2. The cooling liquid is adopted to carry out heat exchange treatment on one side of the display module in the fully-laminated display screen, so that the heat of the display module can be maximally led out in time, and the temperature of the display module is effectively controlled; can play the guard action to display module assembly again, prevent at laser cutting OCA optical cement in-process, laser and display module assembly direct contact receive the damage.

Drawings

Fig. 1 is a flowchart of a method for disassembling a fully-attached display screen according to the present application.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

Example 1

The embodiment provides a method for disassembling a full-lamination display screen, which is used for disassembling a full-lamination display screen of a smart phone in a certain factory exemplarily, wherein the length of the display screen is 16.04cm, the width of the display screen is 7.66cm, and the thickness of the display screen is 0.78cm; wherein, the thickness of the OCA optical cement between apron and the display module assembly is 0.2mm, refers to FIG. 1, includes following step:

s1, placing a display screen on a workbench, and enabling one side of a cover plate of the display screen to be upward;

s6, adopting an optical cement stripping agent to clean the residual OCA optical cement of the cover plate and the display module.

And the liquid level of the cooling liquid in the S2 is higher than the bottom surface of the display module.

And the diameter of the laser spot in the S4 is 1/2 of the thickness of the OCA optical cement between the cover plate and the display module.

The cooling liquid in this example employs: purified water.

The moving device of the application is selected from an XY motion platform or a mechanical handheld device, and the moving speed of the moving device is 10mm/s.

The laser emitting device of the application is selected from one of a fiber laser, a semiconductor laser and a YAG laser, and sets laser parameters thereof: the wavelength was 1030nm.

The working principle of the embodiment is as follows:

firstly, disassembling the mobile phone, taking out the full-lamination display screen of the mobile phone, pouring a little purified water into a groove of a workbench, placing a hanging net in the groove, placing the full-lamination display screen on the hanging net at the groove of the workbench, enabling one side of a cover plate of the display screen to be upward, and adjusting the height of the hanging net to enable the liquid level of the cooling liquid to be higher than the bottom surface of the display module;

secondly, sequentially assembling a collimating lens, a beam expanding lens, a focusing lens and a protective lens to form a laser head, connecting and installing the laser head and a laser emitting device, adjusting optical parameters after the installation is finished, setting the laser wavelength to be 1030nm, and enabling the diameter of a laser spot to be 0.1mm;

then, placing an XY motion platform on one side of the mobile phone, which is fully attached to the length of the display screen, fixedly placing a matched laser device on the XY motion platform, debugging equipment, setting the moving speed of the XY motion platform to be 10mm/s, irradiating OCA (optical clear adhesive) between a cover plate of the display screen and a display module by using laser from left to right, holding two sides of the display screen by two hands after irradiation is finished, pulling the display screen apart along a certain angle, and separating the display screen;

at last, weather display module assembly one side of display screen with the hair-dryer, adopt again that optical cement stripper clears up and falls apron and display module assembly on remaining OCA optical cement, air-dry 2 ~ 3 minutes, carry out the function detection to display module assembly.

The applicant makes further improvement to the technical scheme, and the liquid level of the cooling liquid is lifted to the top of the display module, so that the display module is completely positioned below the liquid level of the cooling liquid in the laser cutting process.

Through the improvement, the cooling liquid submerges the display module, so that the heat of the display module can be maximally led out, and the temperature of the display module is effectively controlled; can play the guard action to display module assembly again, prevent at laser cutting OCA optical cement in-process, laser and display module assembly direct contact cause the damage. In addition, OCA optical cement melts the back, can directly fall into to the coolant liquid in to reduce the residue on the display module assembly.

Examples 2 to 5

The disassembling steps of the fully-laminated display screen provided in the embodiments 2 to 5 are different from those of the embodiment 1 in that: the diameter of the laser spot. The working principle of examples 2 to 5 is the same as that of example 1, except for the following data. The method is specifically shown in the following table 1:

table 1 examples 1-5 performance testing

As can be seen from table 1, the temperature of one side of the display module in each of embodiments 1 to 5 is lower than 80 ℃, and the display module is detected functionally, and it is found that the display module and the components are not damaged, so that it is considered that it is preferable to set the diameter of the laser spot to be smaller than the thickness of the OCA optical cement between the cover plate and the display module.

In addition, in the embodiment 2, in the test operation process, the process of separating the cover plate of the display screen from the display module by the mechanical hand-held device is somewhat difficult, and after the separation is completed, the number of residual OCA optical cement on the cover plate of the display screen and the display module is relatively large; the embodiment 1, the embodiment 3 and the embodiment 4 can normally separate the cover plate from the display module, and the amount of residual OCA optical cement is relatively moderate; in embodiment 5, remaining OCA optical cement is less relatively, but the display module assembly measured the temperature at last relatively higher, at experimental or the lab scale stage, can guarantee that cutting environment and cutting accuracy all are in the best test condition, but when dismantling to the full laminating display screen of the mass production on the market, along with the machine uninterruptedly moves, can influence the machining precision of machine. Therefore, in order to prevent the display module from being damaged in the later period in the actual condition of batch processing in the later period, the light spot diameter is further controlled to be 1/3-2/3 of the thickness of the OCA optical cement between the cover plate and the display module, in the range, the residual OCA optical cement on the display module is relatively less, the temperature for disassembling the display module is controlled to be below 60 ℃, and a better disassembling effect can be obtained.

In summary, it can be considered that the light spot diameter is controlled to be within a range selected by the optimal light spot diameter of 1/3-2/3 of the thickness of the OCA optical cement between the cover plate and the display module, so that the residual amount of the OCA optical cement can be reduced, and a room can be left for batch processing in the later period, thereby further reducing the loss and reducing the cost waste.

Examples 7 to 10

Embodiments 7 to 10 provide a method for disassembling a fully-bonded display screen, which is different from embodiment 3 in that: XY motion stage or robotic hand piece. The working principle of examples 7 to 10 is the same as that of example 1, except for the following data. The method is specifically shown in the following table 2:

TABLE 2 cutting Effect detection

As can be seen from table 2, the moving speed of the embodiment 3 and the embodiments 7 to 10 is different, so that the cutting speed of the laser is affected, and further, the cut OCA optical cement is affected to a certain extent. The cutting effects of the embodiment 3, the embodiment 8 and the embodiment 9 are better; the moving speed of the embodiment 7 is slow, part of the OCA optical cement is in an over-melting state, and the local temperature is too high, so that the display module is damaged when being subjected to function detection; the moving speed of the embodiment 10 is fast, even though the platform moves, the colloid molten state from left to right still presents the slanted bar lines, and the farther to the right the colloid molten state is closer to one side of the display module, and similarly, the display module is detected to find that the colloid molten state is damaged through the function detection. Therefore, it is considered that the optimum cutting effect can be obtained by controlling the moving speed of the moving means to 10 to 20mm/s, and the cutting efficiency is excellent.

Experiment one

The same type of 200 pieces of full-laminated screen are selected and equally divided into two groups of A, B, and the temperature in an operating room is controlled to be 27 ℃ and the humidity is controlled to be 50.

Wherein: the technical scheme of the application is selected for disassembling the group A of fully-laminated screens; the disassembling of the B group of full-laminated screens adopts the technical scheme of a method for disassembling the OCA optical cement in the interlayer by adopting laser, wherein the application number of the method is CN 106475680A. A, B the time required for the two experiments to complete the disassembly was compared. The results are shown in table 3:

test of	Group A	Group B
			Time/s required to complete disassembly	1530	1710

Experiment two

The method comprises the steps of selecting 40 full-lamination display screens of 5 different models, averagely dividing the full-lamination display screens into C, D groups according to different models, controlling the temperature in an operating room to be 27 ℃ and the humidity to be 50, wherein each group comprises 20 full-lamination display screens of each model.

Wherein: the technical scheme of the application is selected for disassembling the group A of fully-laminated screens; the disassembling of the B group of full-laminated screens adopts the technical scheme of a method for disassembling the OCA optical cement in the interlayer by adopting laser, wherein the application number of the method is CN 106475680A. A, B the time required for the two experiments to complete the disassembly was compared. The results are shown in Table 4:

test of	Group C	Group D
			Time/s required for completing disassembly	2200	3100

It can be seen from the combination of tables 3 and 4 that in the two experiments, the time for completing the disassembly of group B is longer than that of group A. In the actual operation process, when two groups are used for debugging laser parameters, the group B consumes more time, and in order to meet the condition of laser power setting: after the energy of the portion of the OCA irradiated by the laser is absorbed by the OCA while the XY stage moves, the temperature is higher than 130-150 ℃ but not higher than 50 ℃. Therefore, the technical scheme of the application has higher practicability and timeliness by comprehensively considering multiple factors when the fully-laminated display screens of various models are disassembled in the face of market batch processing.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A disassembling method of a full-lamination display screen is characterized by comprising the following steps:

2. A disassembling method for a fully-laminated display screen according to claim 1, wherein in S2, the liquid level of the cooling liquid is higher than the top surface of the display module, so that the display module is immersed in the cooling liquid.

3. The method for disassembling the full-lamination display screen according to claim 1, wherein in the step S2, purified water is used as the cooling liquid.

4. The method for disassembling a full-lamination display screen according to claim 1, wherein in S2, the cooling liquid is in a circulating state.

5. The method for disassembling a full-featured display screen according to claim 1, wherein in S3, the moving device is selected from a moving platform and a mechanical handheld device.

6. The method for disassembling the fully-fitted display screen according to claim 5, wherein in the step S3, the moving speed of the moving device is 10-20mm/S.

7. The method for disassembling the full-lamination display screen according to claim 1, wherein in the step S3, the matched laser device comprises a laser emitting device and a laser head; the laser emitting device is selected from one of a fiber laser, a semiconductor laser and a YAG laser.

8. The method for disassembling the full-lamination display screen according to claim 1, wherein in the S3 laser parameter, the wavelength is set to λ = 980-1030nm.

9. A disassembling method of a full-laminated display screen according to claim 1, wherein in the S3, in the optical parameters, the spot diameter is set to be 1/3 to 2/3 of the thickness of the OCA optical cement.

10. The method for disassembling the fully-conformable display screen according to claim 1, further comprising: s6, cleaning the cover plate and/or the residual OCA optical cement on the display module.