JP6374093B2 - Laser packaging system and method - Google Patents

Description

The present invention relates to the field of optical semiconductors, and more particularly to a system and method for packaging glass packages using a laser.

Optical semiconductor devices have already been widely applied to various fields of life. Among them, OLED (organic light emitting diode) has been the focus of research due to its features such as good color contrast, wide viewing angle, and high-speed response, and its applicability is extremely high. However, the electrodes and organic layers in OLED displays are very sensitive to oxygen and moisture. Therefore, oxygen and moisture that enter the OLED device from the external environment significantly shorten the life of the OLED device. Thus, it is very important to provide an effective hermetic seal for OLED devices. Hereinafter, factors that cause difficulty in properly sealing the OLED device will be described.
In a hermetic seal, a barrier to oxygen (10 ⁻³ cm ³ / m ² / day) and water (10 ⁻⁶ g / m ² / day) must be provided.
• The size of the hermetic seal should be as small as possible (less than 2 mm, etc.) and this should not have a significant effect on the size of the OLED display.
The temperature generated in the sealing process must not destroy the materials (electrodes, organic layers, etc.) in the OLED display. For example, the first pixel of an OLED having a distance of about 1-2 mm from the encapsulant in the OLED display must not be heated at a temperature above 100 ° C. in the encapsulation process, otherwise the first Pixel damage may be caused.
• Gases released in the encapsulation process must not contaminate the materials in the OLED display.
• Hermetic seals must be able to insert point connection members (thin film chrome electrodes, etc.) into the OLED display.

In recent years, a sealing method for assisting laser heating using a glass frit has been applied to sealing an OLED display. Above all, the glass frit mixed with a material having a high absorption rate for a specific light wavelength has a characteristic of a low melting point. By adopting a high performance laser device, the glass frit is heated and softened, and a hermetic seal is formed between the cover plate glass having the glass frit on the upper side and the substrate glass having the OLED on the upper side. The glass frit is typically about 0.7-1 mm wide and 6-100 micrometers thick. Controllable laser energy output from the laser device sequentially irradiates and covers the sealing lines of the glass frit, and the glass frit is heated and softened sequentially to form a hermetic seal. However, this continuous glass frit heating method may form a non-uniform temperature distribution (as shown in FIG. 1) inside the glass frit. Also, these non-uniform temperature distributions within the glass frit can cause problems such as cracks, residual stress or delamination, which can hinder or weaken the hermetic connection between the cover plate glass and the substrate glass. Furthermore, it is necessary to select the main parameters of the sealing process, such as laser output, scanning speed, etc., and this method limits the improvement of productivity.

An object of the present invention is to provide a laser packaging system and method used for sealing an OLED display or a glass package, which can solve the above-mentioned problem that the temperature field distribution of the glass frit is non-uniform, By having a fairly wide process window, it contributes to the improvement of the productivity of the OLED display.

In order to achieve the above object, the present invention provides the following laser packaging system. Used to heat the glass frit distributed along a predetermined trajectory in the glass package to seal the glass package, the system being interconnected with the controller module, and the controller module; and A laser module used to generate a laser; and a laser scanning module interconnected with the controller module and the laser module and used to project the laser generated by the laser module onto a glass frit; And the controller module controls the laser scanning module in real time to control the scanning direction of the laser on the glass frit, thereby causing the laser to pass the glass frit along the predetermined trajectory. Used to scan That. The controller module further controls the output power of the laser module in real time, and is used to cause the generated laser to have an output curve corresponding to the predetermined locus in real time.

Preferably, the laser packaging system further includes a temperature measurement module, the temperature measurement module is interconnected with the controller module, and measures and measures the surface temperature of the glass frit irradiated with laser in real time. It is used to feed back the surface temperature to the controller module in real time.

Preferably, the temperature measurement module is a pyrometer.

Preferably, the laser packaging system further comprises a computer, which is interconnected with the controller module and used to exchange data with the controller module.

Preferably, the control device module is a single control device, a control system composed of a plurality of control devices, or a control board that is integrated and mounted inside the computer.

Preferably, a servo motion mechanism is installed in the laser scanning module to change the direction of the laser and the speed and / or acceleration at which the laser scans the glass frit along the predetermined trajectory. Used.

The present invention further provides the following laser packaging method. This method is used to heat a glass frit distributed along a predetermined trajectory in a glass package to seal the glass package, and includes the following steps.
The laser module is activated and a laser is emitted from the laser module.
A laser scanning module is activated to project the laser emitted from the laser module onto the glass frit.
The laser scanning module is controlled in real time through the controller module, the laser is projected in the direction on the glass frit, and the laser is scanned along the predetermined locus.
The output power of the laser module is controlled in real time through the control device module, and the generated laser has an output curve corresponding to the predetermined locus in real time,
The laser is caused to scan the glass frit in a plurality of cycles along the predetermined locus until the glass frit is heated to the melting point.

Preferably, the predetermined trajectory has one or a plurality of straight sections and one or a plurality of curved sections, and the output curve corresponds to the one or a plurality of straight sections. A heating output curve of a section and a heating output curve of one or a plurality of bending sections corresponding to the one or more bending sections, an output power corresponding to the heating output curve of the straight section and the bending section The output power corresponding to the heating output curve is different.

Preferably, the output power of the laser module is adopted in which the plurality of periodic scans are invariably or gradually decreased.

Preferably, the laser packaging method further uses a temperature measurement module to measure the real-time temperature of the glass frit surface and feeds back to the controller module, the number of periodic scans by the controller module, the laser Adjusting at least one of the output power of the module and the speed at which the laser scans the glass frit along the predetermined trajectory to match the temperature change of the glass frit to a predetermined temperature curve.

Preferably, the laser has a speed range of 1 m / s to 5 m / s for scanning the glass frit along the predetermined locus.

Preferably, before activating the laser module, first the laser scanning module is activated, and after the laser scanning module is capable of projecting a laser on the glass frit along the predetermined trajectory at a predetermined speed. Then start the laser module again.

Preferably, the laser packaging method further includes a step of stopping the laser module immediately after the glass frit is heated until the glass frit reaches a melting point, and naturally cooling the glass frit.

Preferably, the laser packaging method further includes a step of stopping the laser module, subsequently moving the laser scanning module for a predetermined time, and then stopping the laser scanning module again.

Preferably, in the laser packaging method, after the glass frit is further heated until it reaches a melting point, the output power of the laser module is reduced to a cooling output value until the glass frit is cooled to a predetermined temperature. And subsequently causing the laser to periodically scan the glass frit along the predetermined trajectory.

Preferably, the laser packaging method further includes a step of performing natural cooling after the glass frit is cooled to a predetermined temperature.

Preferably, in the laser packaging method, the laser module and the laser scanning module are activated synchronously, and the output power of the laser module is increased in a stepwise manner, and the laser scanning module performs the laser at the predetermined speed. It is possible to project on the glass frit along the trajectory, and at the same time, the output power of the laser module can reach a predetermined output.

Preferably, the laser packaging method further synchronizes the output power of the laser module and the speed at which the laser scans the glass frit along the predetermined trajectory after the glass frit is heated until it reaches a melting point. And stepwise decreasing the output power and scanning speed to zero simultaneously.

Compared with the prior art, the beneficial effects of the present invention are mainly realized as follows.
The laser scanning module can cause the laser to scan at high speed and periodically over the glass frit, thereby heating the glass frit uniformly and synchronously, and the temperature field in the prior art packaging process. The problem of non-uniform distribution can be improved. In the presented laser packaging method, the laser module can fire a laser having a predetermined power curve, which can control the heating process of the glass frit based on the predetermined power curve.

Preferably, the additional temperature measurement module can measure and feed back the real-time temperature of the glass frit surface, and adopts a method such as a predetermined temperature increase or a predetermined temperature decrease to heat the glass frit according to a predetermined temperature increase or decrease curve. Can be cooled.

FIG. 1 is a diagram showing temperature distributions at different times of a glass frit employing continuous heating in the prior art.
FIG. 2 is an overhead view of a glass frit-sealed OLED display.
FIG. 3 is a block diagram of the laser packaging system according to the first embodiment of the present invention.
FIG. 4 is a diagram showing an outline of the glass frit laser scanning path of the OLED display according to the first embodiment of the present invention.
FIG. 5 is a diagram showing an outline of a predetermined laser output curve during a single scanning period in the first embodiment of the present invention.
6A to 6B are diagrams showing an outline of a curve simulating the influence of the laser speed and the output on the temperature change of the glass frit in Example 1 of the present invention.
FIG. 7 is a diagram showing an outline of the laser scanning module in the start / stop area and the first synchronous control method of the laser output in the first embodiment of the present invention.
FIG. 8 is a block diagram of a laser packaging system according to the second embodiment of the present invention.
FIG. 9 is a diagram showing an outline of the structure of the laser packaging system in Example 2 of the present invention.
FIG. 10 is a diagram showing an outline of a laser scanning module in the start / stop area and a second synchronous control method of laser output.
FIG. 11 is a diagram showing an outline of a predetermined temperature increase and predetermined temperature decrease curve in Example 2 of the present invention.
FIG. 12 is a diagram showing temperature distributions at different times of the glass frit after being heated by employing the laser packaging system and method in Example 1 or Example 2 of the present invention.

Hereinafter, the laser scanning sealing glass package system and method of the present invention will be described in more detail with reference to the drawings. This is a preferred embodiment of the present invention, and it should be understood by those skilled in the art that the present invention described herein can be modified to realize the beneficial effects of the present invention. is there. Therefore, it should be understood that the following description can be widely known by those skilled in the art and does not limit the present invention.

For the sake of clarity, not all features of the actual embodiment are described. In the following description, well-known functions and structures will not be described in detail so that the present invention will not be confused by describing unnecessary branches and leaves. In developing an actual embodiment, a number of detailed descriptions are available to achieve a developer's specific goals, such as changing from one embodiment to another according to the relevant system or related commercial constraints. It should be recognized that the example needs to be implemented. It should also be understood that these development tasks can be complex and time consuming, but are only normal tasks for engineers in this field.

In the following paragraphs, the invention will be described more specifically by way of example with reference to the drawings. The following description and claims will further clarify the advantages and features of the present invention. The drawings all employ a very simplified form and use inaccurate scale ratios, and these drawings are only to help explain the embodiments of the present invention easily and clearly. Needless to say, use.

Example 1 As shown in FIG. 2 and FIG. 3, in this example, a laser packaging system is presented, in order to form a hermetic seal by employing a glass frit for the OLED display 120. Used. The OLED display 120 is a typical glass package, and the main structure of the OLED display 120 includes a cover plate glass 121, a glass frit 122, a substrate glass 123, an OLED layer 125, a plurality of electrodes 124, Have Further, the glass frit 122 is positioned on the substrate glass 123 of the OLED display 120, and the cross-sectional view thereof is as shown in FIG. 3, and the overhead view is as shown in FIG. The glass frit 122 is pre-cured on the substrate glass 123 through screen printing and pre-sintering steps to form a filleted rectangular sealing line having a certain thickness. The OLED layer 125 on the substrate glass 123 is positioned inside the glass frit 122 sealing line, and there are a plurality of electrodes 124 connected to the inside and outside of the OLED display 120 on the substrate glass 123.

In this embodiment, the laser packaging system includes a control device module 201, a laser module 202, and a laser scanning module 203. The control device module 201 further includes the laser module 202 and a laser scanning module, respectively. 203, and is used to control the laser module 202 and the laser scanning module 203. The laser module 202 is interconnected with the laser scanning module 203, and the laser module 202 The laser scanning module 203 is used to change the transmission direction and motion characteristics of the laser 100. The laser scanning module 203 is used to generate and emit a laser to the laser scanning module 203 with a predetermined output. The system further includes a computer 200, which is connected to the control device module 201 and used to exchange data with the control device module 201.

Further, the control device module 201 may be a single control device, a control system formed by combining a plurality of control devices, or a control board that is integrated and mounted inside the computer 200.

In this embodiment, the laser scanning module 203 can be a scanning galvanometer. The laser scanning module 203 has a servo motion mechanism (not shown in the figure). The servo motion mechanism has a function of changing the transmission direction of the laser 100, and the laser 100 can be arbitrarily set based on a fixed axis having a space. The deflection angle θ has a maximum upper limit value. The deflection direction and the deflection angle θ of the laser 100 can be controlled, and the change rule is determined by a control signal transmitted from the control device module 201 to the laser scanning module 203. The servo motion mechanism can change the deflection posture of the laser 100 at high speed and accurately, and controls changes in the deflection motion characteristics of the laser 100 in the scanning process, such as angular velocity and angular acceleration, based on the control signal. Can do. The laser scanning module 203 projects the laser 100 onto the glass frit 122. The laser 100 forms a spot 110 having a specific shape and size on the surface of the glass frit 122.

The laser module 202 can generate a laser 100 having a specific wavelength, and transmit light energy of the laser 100 to the laser scanning module 203 with a predetermined output. The optical energy of the laser 100 having the predetermined output can be adjusted in real time, and the adjustment of the optical energy of the laser 100 and the start and stop of the transmission of the laser 100 are both controlled by a control signal transmitted from the controller module 201 to the laser module 202. It is determined.

The controller module 201 controls the laser module 202 and the laser scanning module 203 synchronously, and starts and stops the laser 100 output from the laser module 202, and adjusts the laser output. And align with each other. Alternatively, the controller module 201 can control the laser module 202 with a higher resolution than the control resolution of the laser scanning module 203, and the control of both can be mutually matched. Data communication can be performed between the control device module 201 and the computer 200, and information such as a motion trajectory, a speed curve, an output curve, a delay, a target temperature, start and stop, etc. transmitted from the computer 200 can be transmitted. At the same time, information such as the operating state of each module is transmitted to the computer.

As another aspect of the present embodiment, a laser packaging method that further employs the above-described laser packaging system is presented. The method includes the following steps.

S100:
The controller module 201 controls the laser module 202 and causes the laser module 202 to emit a laser 100 having a predetermined output curve.
S200:
The controller module 201 controls the laser scanning module 203 to project the laser 100 onto the glass frit 122 via the laser scanning module 203, and the laser scanning module 203 causes the laser 100 to have a predetermined speed. Periodic scanning is performed along the glass frit 122 while maintaining the movement locus, and the glass frit is heated until reaching the melting point of the glass frit to form a hermetic seal.

Specifically, the laser module 202 and the laser scanning module 203 are controlled, the laser 100 is projected onto the glass frit 122, and a slightly high-speed laser 100 having a predetermined output is applied to the pattern of the glass frit 122 (as indicated by the sealing line). ), That is, according to the movement trajectory with arrows shown in FIG. 4, and the speed range is 1 m / s to 5 m / s, for example, 3 m / s. The laser 100 is irradiated on the glass frit 122 at point a2 in FIG. 4 with a spot 110 having a fixed shape and size, starts output, scans once along the sealing line, and returns to point a2. One scanning cycle is assumed. The a2 point is an example point, and the output start point of the laser 100 referred to in the text is not limited to this position. Within one scanning period, the glass frit 122 absorbs the energy of the laser 100 and then is sequentially heated, and the scanning speed is high. Therefore, it is considered that the glass frit on the sealing line is heated almost simultaneously. Under normal conditions, sufficient energy cannot be provided to the glass frit 122 in one scanning cycle. Therefore, the two glass substrates 121 and 123 cannot be connected in one scanning cycle alone, and a hermetic seal is formed. Can not do it.

Within one scanning period, the scanning control system controls the laser module 202 and the laser scanning module 203 (hereinafter, abbreviated as a scanning galvanometer or a galvanometer in the figure) via the controller module 201, and the laser 100 Synchronize movement operation and laser output adjustment operation. Based on the method of the predetermined output curve, as shown by the laser output curve in FIG. 5, it is not limited to only this output curve, but depending on the laser output, predetermined positions b1-b2, c1-c2 , D1-d2 and e1-e2 cause a linear or non-linear change. As shown in FIG. 4, the predetermined positions b1-b2, c1-c2, d1-d2, and e1-e2 are filleted rectangular corner portions. Since the energy required by the corner portion is smaller than the straight portion, the laser output of this portion should be smaller than the laser output of the straight portion. That is, the predetermined output curve has an output of the heating section and an output of the bending section, and the output of the heating section is a laser output in which the laser 100 scans a straight portion, and the output of the bending section is a corner of the laser 100. There is a certain difference between the two laser outputs that scan the part, so that the glass frit 122 on the sealing line can acquire a relatively uniform energy, and a relatively uniform temperature rise. Cause it to occur.

The laser module and the galvanometer are controlled to cause the laser 100 to repeat the above-described scanning cycle, and scanning is performed using the laser 100 having a plurality of scanning cycles, and the glass frit 122 acquires sufficient energy, thereby the two glass substrates 121. And 123 are connected to form a hermetic seal, and after the laser 100 completes one periodic scan, the output value remains unchanged, or the output value at which the temperature rise decreases stepwise. Adopting the next periodic scan, the latter can heat the glass frit 122 using a temperature curve in which the temperature rise decreases step by step, and whether the target temperature is reached by increasing the number of scans Or equally different output curves can be employed for each scan period.

As shown in FIGS. 6A and 6B, FIG. 6A shows that the laser output P is also 400 W, and the glass frit 122 having the same length of 0.3 m is scanned 10 times (n = 10), This is a case where the scanning speed v of the laser 100 of the curve a is 3 m / s and the speed v of the curve b is 1 m / s. Differences are observed. Curves 1, 2, and 3 in FIG. 6B are temperature rise curves obtained when the number of scans n and the scan speed v are equal and the laser output p is different, and curve 4 indicates that the output p is Equally, a temperature rise curve obtained when the speed v and the number of scans n are different is presented. From FIG. 6A and FIG. 6B above, it can be seen that an appropriate temperature rise curve can be obtained by changing the three parameters of the number of scans, speed, and laser output.

The glass frit 122 is cooled after a single scanning cycle is completed such that the glass frit 122 on the sealing line absorbs sufficient energy (after reaching a predetermined temperature). One cooling method adopts a natural cooling method, and directly stops the laser output to naturally cool the glass frit 122. Since the glass frit 122 on the sealing line is heated synchronously, the cooling rate is slower than the continuous cooling rate. In another cooling method, periodic scanning is performed using a cooling output value lower than the heating output value until the glass frit is cooled to a predetermined temperature. That is, after heating is completed, the scanning cycle is repeated, the glass frit 122 is scanned with a relatively low laser output via a predetermined output curve method, and the glass frit 122 is cooled according to a predetermined cooling curve. adopt. Since the cooling curve can be controlled to have a gradual cooling rate, a relatively good thermal stress can be generated in a cooling process with a relatively small temperature difference. Furthermore, the latter cooling control method of the glass frit 122 may be a method of controlling the entire cooling process of the glass frit 122, and the cooling rate of one section in the natural cooling process of the glass frit 122 is relative. Alternatively, the control may be performed for only the high-speed part, and natural cooling may be adopted for the other parts.

An optimized control method is adopted for the scanning start area and the stop area of the laser 100. One optimization method is to control the movement of the galvanometer in the start-up area, that is, the a1-a2 area in FIG. 4, do not start the laser output, and activate the servo mechanism inside the galvanometer before reaching the a2 point. After entering the motion trajectory and motion speed, the laser output is activated at point a2, and at this time, the laser 100 also has the predetermined motion trajectory and motion speed, and after completing all scanning cycles, the laser is activated at point a2. The output is stopped, and the servo mechanism in the galvanometer is kept operating for a fixed time with a predetermined movement locus and speed, and the movement of the servo mechanism is stopped at point a3. Please refer to FIG.

Embodiment 2 As shown in FIG. 8, in this embodiment, the presented laser packaging system is additionally provided with a temperature measurement module 204 compared to Embodiment 1, and the temperature measurement module 204 includes the controller module 201 and the controller module 201. Connected to each other, the laser 100 measures the real-time temperature of the spot 110 irradiated on the surface of the glass frit 122 and is used to feed back the real-time temperature of the spot to the controller module 201. The temperature measurement module 204 measures the temperature of the glass frit 122 at the position where the spot 110 is located in a non-contact and real-time manner and feeds it back to the controller module 201. The feature is that the temperature measurement module 204 can measure the temperature of the glass frit 122 where the spot 110 is located with sufficient time / spatial resolution even when the spot 110 moves at high speed. The control device module 201 collects the temperature signal fed back from the temperature measurement module 204 and constitutes a closed loop control circuit via the laser module 202 and the control signal. The closed loop control circuit has a control resolution equal to or higher than that of the laser scanning module 203.

As shown in FIG. 9, the system of laser scanning sealing glass package presented includes a computer 210, a control device 220, a laser device 250, a scanning galvanometer unit 230, and a pyrometer 240, and The pyrometer 240 is a temperature measurement module.

From the above, the laser packaging method presented in the present embodiment is distinguished from the first embodiment as follows.

The glass frit 122 can be heated with a predetermined temperature curve by adopting a predetermined temperature raising method. The glass frit 122 can be cooled by a predetermined temperature curve by adopting a predetermined temperature decreasing method.

Specifically, within one scanning period, the laser device 250 and the galvanometer 230 are controlled via the control device 220, and the movement operation of the laser 100 and the adjustment operation of the laser output are synchronized. The real-time temperature of the spot 110 portion of the laser 100 at the time is measured, the temperature information fed back from the pyrometer 240 is collected by the control device 220, and compared with a predetermined target temperature and calculated, the real-time laser output. Thus, when the glass frit 122 of each part on the sealing line acquires relatively uniform energy and reaches a predetermined temperature, the closed-loop control targeting the temperature of the glass frit 122 is completed. In the temperature feedback control method, a predetermined temperature raising method is adopted, and the glass frit 122 is heated according to a predetermined temperature curve to finally reach the target temperature. Refer to the temperature curve shown in section ab in FIG.

After a single scanning cycle is completed such that the glass frit on the sealing line absorbs sufficient energy (after reaching a predetermined temperature), the cooling method can be a method that repeats the scanning cycle, and temperature feedback. According to the control method, the glass frit 122 is scanned with a relatively low laser output, and the glass frit 122 is cooled according to a predetermined cooling curve. Refer to the temperature curve shown in the section bc in FIG. The cooling control method for the glass frit may be a method for controlling the entire cooling process of the glass frit 122, and a portion in which a cooling rate of a section in the natural cooling process of the glass frit 122 is relatively high. It is also possible to employ a method in which control is performed only for the target and natural cooling is used for the other parts. Refer to the temperature curve shown at cd in FIG.

In the present embodiment, another optimization control method described below is presented for the scanning start area and the stop area of the laser 100. That is, at the start-up stage, the galvanometer motion and the laser output are started synchronously at the point a1, and the laser output power is controlled to increase stepwise from the low output, and at the same time the predetermined output is reached at the point a2. The galvanometer also enters a predetermined motion state, and then normal periodic scanning is performed. In the completion stage, the laser output power is adjusted and decreased step by step at point a2, and the laser output and the galvanometer motion are stopped synchronously at point a3. A specific control curve is as shown in FIG.

The uniformity of heating in the case of employing the laser packaging system and method presented in this embodiment can be read from the temperature distribution of FIG. Compared to the continuous contour packaging method employed in the prior art, the glass frit 122 has a more uniform temperature field distribution, and even in the spatial scan results, the glass frit 122 is more uniform than the prior art. It has a spatial temperature field distribution.

The technical solution also has a fairly wide process window and contributes to the productivity of OLED displays. Taking a 4.3 inch OLED display as an example, the total length of its sealing glass frit profile is about 0.3 m. In existing continuous contour packaging methods, the process is limited, the maximum laser scanning speed is about 20 mm / s, and the single packaging time is about 15 s. On the other hand, when packaging is performed using the method of the present technical solution, the scanning window is set to 300 mm / s or more because the process window is wide (each can be selected with a different number of scans, laser output and speed). The speed can be increased, the laser output can be increased to 200 W or more, and the packaging efficiency can be improved to the maximum.

In the present technical solution, the temperature of the glass frit 122 in various places on the sealing line changes almost synchronously and uniformly. Therefore, in the present technical solution, the number of periodic scans, the laser output per round, or the laser By controlling the change in the movement speed, the temperature rise and fall curves of the sealing glass frit 122 are controlled to approximate, and a predetermined temperature rise curve for the glass frit 122 that cannot be realized by the conventional technical solution means Realizes control according to the temperature drop curve.

In addition, the technical solution can satisfy the requirements regarding the hermetic seal of the OLED display, and can solve the problems related to the sealing of the start area and the stop area in the laser sealing process of the OLED display.

In summary, in the laser packaging system and method provided by the embodiments of the present invention, the laser scanning module can cause the laser to perform high-speed and periodic scanning on the glass frit. The heating can be performed uniformly and synchronously, and the problem of non-uniform temperature field distribution in the prior art packaging process can be improved. Also, in the laser packaging method presented by the present invention, the laser module can fire a laser having a predetermined output curve, thereby controlling the heating process of the glass frit based on the predetermined output curve.

Preferably, the additional temperature measurement module can measure and feedback the real-time temperature of the glass frit surface, and adopts a method such as a predetermined temperature increase or a predetermined temperature decrease to heat the glass frit according to a predetermined temperature increase or decrease curve. Can be cooled.

The above are only preferred embodiments of the present invention, and do not limit the present invention. Any form of equivalent replacement or correction made by the technical person in the technical field to the technical solution and technical contents disclosed by the present invention without departing from the scope of the technical solution of the present invention. All the modifications do not deviate from the contents of the technical solution of the present invention and fall within the scope of protection of the present invention.

Claims (11)

A laser packaging method used for sealing a glass package by heating a glass frit distributed along a predetermined locus in the glass package,
Activating a laser module to fire a laser from said laser module;
Activating a laser scanning module to project the laser emitted from the laser module onto a glass frit;
Controlling the laser scanning module in real time via a controller module to project a laser in a direction on the glass frit, causing the laser to scan the glass frit along the predetermined trajectory;
A laser generated by controlling the output power of the laser module through the controller module in real time has an output curve corresponding to the predetermined locus in real time;
Causing the laser to scan the glass frit in multiple cycles along the predetermined trajectory until the glass frit is heated to the melting point;
Including the steps
A laser packaging method comprising :
Before starting the laser module, first, the laser scanning module is started, and after the laser scanning module can project a laser on the glass frit along the predetermined trajectory at a predetermined speed, the laser scanning module is started again. Start the laser module,
Laser packaging method. The predetermined trajectory has one or more straight sections and one or more curved sections,
The output curve includes a heating output curve of one or a plurality of straight sections corresponding to the one or more straight sections and a heating output of one or a plurality of curved sections corresponding to the one or more curved sections. A curve, and
The output power corresponding to the heating output curve in the straight section is different from the output power corresponding to the heating output curve in the curved section,
The laser packaging method according to claim 1 . Employing the output power of the laser module in which the plurality of periodic scans are invariant or gradually reduced;
The laser packaging method according to claim 1 . A temperature measurement module is used to measure the real-time temperature of the glass frit surface and feed back to the controller module, the controller module performing periodic scanning, the output power of the laser module, and the laser Adjusting at least one of the speed at which the glass frit is scanned along the predetermined trajectory to match a temperature change of the glass frit to a predetermined temperature curve,
The laser packaging method according to claim 1 . The speed range at which the laser scans the glass frit along the predetermined locus is 1 m / s to 5 m / s.
The laser packaging method according to claim 4 . Wherein after the glass frit is heated until it reaches a melting point, immediately stops the laser module further seen including a step of naturally cooling the glass frit,
The laser packaging method according to claim 1 . After stopping the laser module, the method further includes the step of continuously moving the laser scanning module for a certain period of time, and then stopping the laser scanning module again.
The laser packaging method according to claim 6 . After the glass frit is heated until it reaches the melting point, the output power of the laser module is reduced to a cooling output value, and the laser continues to follow the predetermined trajectory until the glass frit is cooled to a predetermined temperature. A step of periodically scanning the glass frit.
The laser packaging method according to claim 1 . After the glass frit is cooled to a predetermined temperature, it further includes a step of performing natural cooling.
The laser packaging method according to claim 8 . The laser module and the laser scanning module are activated synchronously, and the output power of the laser module is increased stepwise, and the laser scanning module causes the laser to move along the predetermined trajectory at a predetermined speed. At the same time as projecting on the frit, the output power of the laser module reaches a predetermined output,
The laser packaging method according to claim 1 . After the glass frit is heated until it reaches the melting point, the output power of the laser module and the speed at which the laser scans the glass frit along the predetermined locus are adjusted synchronously, and the output power and the scanning speed are adjusted. Further comprising the step of stepwise decreasing to zero simultaneously
The laser packaging method according to claim 10 .

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