An optical device for laser packaging

Abstract

The application discloses an optical device for laser packaging, comprising a base, a mirror group arranged in the base, a rotating lens barrel arranged on the base and a lens group arranged in the rotating lens barrel, a visual camera arranged on the same side of the base as the rotating lens barrel, a fiber support arranged on the base and located on both sides of the rotating lens barrel as the visual camera, and a thermometer arranged on the surface of the base and located on the adjacent surface of the base as the rotating lens barrel. The optical device for laser packaging can improve the packaging quality of a display panel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of laser processing equipment, in particular to an optical device for laser packaging. BACKGROUND

[0002] When the organic light-emitting diode (OLED) display panel is packaged, laser packaging (Laser Sealing) can be performed by using glass glue (FRIT). The glass glue located in the sealing area is melted by moving the laser beam, and after the melted glass glue cools down, a sealed packaging space is formed between the packaging cover plate and the substrate to be packaged.

[0003] However, the FRIT Sealing process requires a large amount of sealing material, and also has certain requirements for the laser sealing process. When the glass glue is melted by laser to fuse the glass glue and the substrate, bubbles or cracks may occur, and too high or too low laser power may also cause sealing failure. During the laser melting process, the glass glue will generate stress due to heating. When the glass glue is melted and cooled to form a packaging structure fixed with the packaging cover plate and the substrate to be packaged, the residual stress in the packaging structure may cause the packaging structure to crack or peel off, thereby possibly leading to sealing failure of the packaging structure. SUMMARY

[0004] The present application aims to provide an optical device for laser packaging, which can alleviate the phenomenon of cracking or peeling of the packaging interface caused by residual stress in the packaging interface, thereby improving the efficiency of laser packaging and improving the packaging quality of the display panel.

[0005] The present application provides an optical device for laser packaging, comprising at least:

[0006] a base, the base is provided with a mirror group inside;

[0007] a rotating lens barrel, provided on the base, and a lens group is provided in the rotating lens barrel;

[0008] a visual camera, provided side by side with the rotating lens barrel on the same side of the base;

[0009] a fiber support, provided on the base, and the fiber support and the visual camera are located on both sides of the rotating lens barrel; and

[0010] a temperature meter, provided on the surface of the base, and the temperature meter and the rotating lens barrel are provided on adjacent surfaces of the base.

[0011] In an embodiment of the present application, the optical device further comprises an output end, which is provided opposite to the rotating lens barrel on both sides of the base.

[0012] In one embodiment of the present invention, the reflector group includes a first reflector located between the output end and the rotating mirror tube, and the angle between the axis of the first reflector and the axis of the rotating mirror tube is 45°.

[0013] In one embodiment of the present invention, the reflector group includes a second reflector, which is arranged parallel to the first reflector and is disposed at the bottom of the vision camera, and visible light enters the vision camera from the second reflector.

[0014] In one embodiment of the present invention, the lens group includes a convex lens group and a concave lens group, and the convex lens group and the concave lens group are arranged alternately.

[0015] In one embodiment of the present invention, the convex lens group includes a first convex lens, a second convex lens and a third convex lens, wherein the second convex lens is disposed between the first convex lens and the third convex lens.

[0016] In one embodiment of the present invention, the first convex lens and the third convex lens are fixed inside the rotating lens barrel, allowing the rotating lens barrel to adjust the second convex lens to reciprocate.

[0017] In one embodiment of the present invention, the concave lens group includes a first concave lens, which is fixed between the first convex lens and the second convex lens.

[0018] In one embodiment of the present invention, the concave lens group includes a second concave lens, which is fixed between the second convex lens and the third convex lens.

[0019] In one embodiment of the present invention, the optical fiber support includes a connecting plate and a supporting plate. The connecting plate is connected to the base, and the supporting plate is located in the plane containing the axis of the rotating lens barrel, and the supporting plate has a preset distance from the rotating lens barrel.

[0020] This invention provides an optical device for laser packaging, which can improve energy utilization efficiency and reduce damage to the packaging interface on the display panel. It effectively reduces the phenomenon of cracking or peeling of the packaging structure caused by the inability to release the enormous stress generated by heat in the glass adhesive in time, and also effectively reduces defects such as misalignment and displacement of the packaging interface caused by untimely fixing of the packaging interface. Therefore, it improves the stability and consistency of the laser packaging process, increases the efficiency of laser packaging, and improves the packaging quality of the display panel. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an optical device for laser packaging in one embodiment.

[0023] Figure 2 This is a schematic diagram of the structure of a laser head assembly in one embodiment.

[0024] Figure 3 This is a partial structural diagram of the laser head assembly in one embodiment.

[0025] Figure 4 This is a schematic diagram of the lens assembly in one embodiment.

[0026] Figure 5 This is a schematic diagram of the thermometer in one embodiment.

[0027] Figure 6 This is a schematic diagram of the structure of a laser packaging device in one embodiment.

[0028] Label Explanation:

[0029] 10. Optical equipment; 100. Fiber optic bracket; 101. Connecting plate; 102. Support plate; 200. Laser head assembly; 201. Base; 202. Mounting platform; 203. Rotating lens barrel; 204. Output end; 205. Vision camera; 206. Reflector group; 2061. First reflector; 2062. Second reflector; 207. Through hole; 208. Scale line; 209. Convex lens group; 2091. First convex lens; 2092. Second convex lens; 2093. Third convex lens; 210. Concave lens group; 2101. First concave lens; 2102. Second concave lens; 300. Thermometer; 301. Head; 302. Tail; 20. Workbench; 30. Frame. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying diagrams of this specification are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the implementation of this solution and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this solution, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this solution's implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this solution's implementation.

[0032] OLED devices, as a novel type of flat panel display, have attracted increasing attention due to their characteristics such as active light emission, high brightness, wide viewing angle, fast response speed, low power consumption, and flexibility. They are widely used in smartphone screens, television display panels, automotive front and rear lights, interior lighting, automotive display panels, wearable devices, and VR. This invention provides an optical device for laser packaging, which can be used for laser packaging of OLED display panels, improving the packaging quality of the display panels and applicable to the packaging of OLED devices of different sizes.

[0033] Please see Figure 1 As shown, the present invention provides an optical device for laser packaging, including a fiber optic bracket 100, a laser head assembly 200, and a thermometer 300. The laser head assembly 200 includes a base 201, a rotating lens barrel 203, and a vision camera 204. The fiber optic bracket 100 includes a connecting plate 101 and a support plate 102. The connecting plate 101 is connected to the base 201, and the support plate 102 is located in the plane containing the axis of the rotating lens barrel 203, with a predetermined distance between the support plate 102 and the rotating lens barrel 203. An optical fiber is inserted into the laser head assembly 200 from the rotating lens barrel 203 via the fiber optic bracket 100. The thermometer 300 is disposed on the side of the laser head assembly 200 to detect the temperature of the laser radiation reaching the packaging interface.

[0034] Please see Figure 1 and Figure 2As shown, in one embodiment of the present invention, the fiber optic bracket 100 includes a connecting plate 101 and a support plate 102. The connecting plate 101 is, for example, arranged in an inverted "L" shape. One end of the connecting plate 101 is connected to the laser head assembly 200, and the other end is connected to the support plate 102. The support plate 102 is suspended directly above the laser head assembly 200. In one embodiment of the present invention, the fiber optic bracket 100 is connected to the laser head assembly 200, for example, by bolts. In other embodiments, the fiber optic bracket 100 can also be fixed to the laser head assembly 200 by means of an integrated design or a hinge connection. One end of the optical fiber is connected to a laser (not shown in the figure), and the other end of the optical fiber is wound around the support plate 102 of the fiber optic bracket 100, suspended above the laser head assembly 200, and connected to the laser head assembly 200. The optical fiber serves as a laser beam transmission channel, for example, transmitting the laser emitted by the laser to the laser head assembly 200.

[0035] Please see Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the laser head assembly 200 includes a base 201, a rotating lens barrel 203, and a vision camera 205, etc. The rotating lens barrel 203 and the vision camera 205 are arranged side by side on the same side of the base 201. Multiple lenses are arranged inside the rotating lens barrel 203, and the diameter of the laser spot at the laser focal point is adjusted by rotating the rotating lens barrel 203.

[0036] Please see Figure 1 and Figure 2As shown, in one embodiment of the present invention, the base 201 is hollow, and an output end 204 is provided on the base 201. The output end 204 is, for example, circular. In one embodiment of the present invention, the rotating lens barrel 203 is, for example, cylindrical. The output end 204 and the rotating lens barrel 203 are located on the same central axis, and the output end 204 and the rotating lens barrel 203 are located on opposite sides of the base 201. In one embodiment of the present invention, the rotating lens barrel 203 is mounted on the base 201 via a mounting platform 202. The mounting platform 202 is, for example, cylindrical, and the rotating lens barrel 203 and the mounting platform 202 are coaxial. In one embodiment of the present invention, the diameter of the mounting platform 202 is larger than the diameter of the rotating lens barrel 203, for example, 4mm-8mm larger. The mounting platform 202 is fixed on the base 201, and the rotating lens barrel 203 can rotate within the mounting platform 202. In one embodiment of the present invention, a through hole 207 is provided at one end of the rotating mirror tube 203 relative to the mounting stage 202, and an optical fiber is inserted into the interior of the rotating mirror tube 203 through the through hole 207. Specifically, the support plate 102 on the optical fiber support 100 is located in the plane containing the axis of the rotating mirror tube 203, that is, the side surface of the support plate 102 relative to the connecting plate 101 is in the same plane as the axis of the rotating mirror tube 203, and the support plate 102 and the rotating mirror tube 203 have a preset distance. The optical fiber is wound on the support plate 102 and inserted into the interior of the rotating mirror tube 203 through the through hole 207, so that the laser beam enters along the axis of the rotating mirror tube 203. The laser beam passes through the rotating mirror tube 203, the mounting stage 202 and the base 201 in sequence, and radiates from the output end 204 to the encapsulation interface. The diameter of the light spot radiated to the encapsulation interface is adjusted by the rotation of the rotating mirror tube 203. In one embodiment of the present invention, a scale line 208 is engraved on the outer wall of the rotating lens barrel 203. The scale line 208 is located at one end of the rotating lens barrel 203 near the through hole 207. The scale line 208 marks the size of the diameter of the light spot radiated to the encapsulation interface.

[0037] Please see Figures 2 to 4As shown, in one embodiment of the present invention, a plurality of lenses are disposed inside the rotating lens barrel 203, including a convex lens group 209 and a concave lens group 210, and the convex lens group 209 and the concave lens group 210 are alternately arranged. The position of the lenses is adjusted by rotating the rotating lens barrel 203, thereby adjusting the diameter of the light spot radiating to the encapsulation interface. Specifically, a first convex lens 2091, a first concave lens 2101, a second convex lens 2092, a second concave lens 2102, and a third convex lens 2093 are arranged sequentially from one end of the rotating lens barrel 203 near the through hole 207 to one end near the mounting stage 202. The positions of the first convex lens 2091, the first concave lens 2101, the second concave lens 2102, and the third convex lens 2093 are fixed, while the position of the second convex lens 2092 is movable. The position of the second convex lens 2092 is adjusted by rotating the rotating lens barrel 203, thereby adjusting the diameter of the laser spot radiating to the packaging interface. The diameter of the laser spot is, for example, 500 μm to 1500 μm. In one embodiment of the invention, adjusting the position of the second convex lens 2092 closer to the first concave lens 2101 increases the diameter of the laser spot incident on the packaging interface. Conversely, adjusting the position of the second convex lens 2092 closer to the second concave lens 2102 decreases the diameter of the laser spot incident on the packaging interface.

[0038] Please see Figures 2 to 4 As shown, in one embodiment of the present invention, a first convex lens 2091 is used to reduce the divergence angle of the laser incident at the first convex lens 2091, a first concave lens 2101 is used to increase the divergence angle of the laser passing through the first concave lens 2101, a second convex lens 2092 is used to reduce the divergence angle of the laser passing through the second convex lens 2092, a second concave lens 2102 is used to increase the divergence angle of the laser passing through the second concave lens 2102, and a third convex lens 2093 finally focuses the laser onto the encapsulation interface. In one embodiment of the present invention, the distance between the third convex lens 2093 and the encapsulation interface remains constant, the laser is finally focused onto a fixed position on the encapsulation interface, and the final laser beam energy distribution obtained at the encapsulation interface is a flat-top laser beam. The flat-top laser beam profile has no wings, but has a steeper edge transition, thus resulting in higher energy utilization efficiency and reduced damage to the area surrounding the glass adhesive material.

[0039] Please see Figure 1 and Figure 2As shown, in one embodiment of the present invention, a reflector group 206 is further provided inside the base 201. The reflector group 206 includes a first reflector 2061 and a second reflector 2062. The first reflector 2061 is disposed between the output end 204 and the rotating mirror tube 203, and the angle between the central axis of the first reflector 2061 and the rotating mirror tube 203 is, for example, 45°. The second reflector 2062 is arranged parallel to the first reflector 2061 and is located directly below the vision camera 205. Visible light from the encapsulation interface enters the laser head assembly 200 through the output end 204, is reflected by the first reflector 2061 to the second reflector 2062, and then reflected by the second reflector 2062 to the vision camera 205. Through imaging by the vision camera 205, the real-time status image of the encapsulation interface during OLED display panel processing is transmitted to the display device of the laser encapsulation equipment, facilitating timely detection and troubleshooting of processing abnormalities.

[0040] Please see Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the laser transmitted through the optical fiber in the rotating mirror tube 203 directly passes through the first reflecting mirror 2061 and radiates from the output end 204 to the encapsulation interface. The laser power is relatively low and will not damage the first reflecting mirror 2061. In one embodiment of the present invention, for example, a power meter is used to detect the power of the laser output from the output end 204, and the output laser power is, for example, 45W-55W, and the energy density of the output laser is greater than or equal to 17kW / cm². 2 Setting the output laser power within this range ensures the encapsulation quality of the OLED display panel. Excessive power causes the silicone sealant to heat up and solidify rapidly, generating significant internal stress that cannot be released in time. After the sealant melts and cools to form the encapsulation structure fixed to the cover plate and the substrate, the residual stress within the encapsulation structure can cause cracking or peeling. Insufficient power prevents the sealant from melting quickly enough, reducing encapsulation efficiency. Furthermore, the prolonged melting and cooling process prevents the cover plate and substrate from being fixed in time, potentially leading to misalignment or displacement of the substrate during encapsulation, thus affecting the overall encapsulation quality.

[0041] Please see Figure 1 and Figure 5As shown, in one embodiment of the present invention, the thermometer 300 is, for example, an infrared thermometer, which converts the infrared energy radiated by the glass sealant into an electrical signal to determine the temperature of the encapsulation interface. The thermometer 300 has advantages such as fast response time, non-contact operation, safe use, long service life, and a wide temperature measurement range. In one embodiment of the present invention, the wavelength range of the infrared light measured by the thermometer 300 is, for example, 2.0μm-2.6μm, the temperature range is, for example, 200℃-1800℃, and the exposure time is, for example, 2ms. In one embodiment of the present invention, the thermometer 300 includes a head 301 and a tail 302. An infrared detector is provided on the tail 302, and a signal amplifier, a signal processor, and a display screen are provided on the head 301. The infrared detector on the tail 302 detects the infrared radiation energy of the encapsulation interface and converts it into an electrical signal. The electrical signal is amplified and processed by the signal amplifier and the signal processor, and the temperature value is displayed on the display screen. In other embodiments, the thermometer 300 may also be, for example, a thermocouple thermometer, an optical thermometer, or a radiation thermometer.

[0042] Please see Figure 6 As shown, in one embodiment of the present invention, the laser packaging equipment includes multiple optical devices 10, a worktable 20, and a frame 30. The multiple optical devices 10 are arranged side by side on the frame 30 and suspended above the worktable 20. The substrate to be packaged is placed on the worktable 20. The laser beam from the optical device 10 is perpendicularly incident on the surface of the substrate to be packaged, and the optical device 10 adjusts the diameter of the laser spot incident on the surface of the substrate to be packaged, thereby adjusting the laser power at the packaging interface. This reduces damage to the packaging interface on the display panel and improves the packaging quality of the display panel.

[0043] In summary, the optical device for laser packaging provided by this invention adjusts the diameter of the laser spot at the packaging interface by rotating the lens barrel to move the position of the convex lens, thereby adjusting the laser power at the packaging interface. This effectively reduces the phenomenon of cracking or peeling of the packaging structure caused by the inability to release the enormous stress generated by the heat on the glass adhesive in time. It also effectively reduces the occurrence of misalignment and displacement of the packaging interface due to untimely fixing, thus improving the stability and consistency of the laser packaging process, increasing its efficiency, and improving the packaging quality of the display panel. Furthermore, the output laser beam has a flat-top laser beam energy distribution, which improves energy utilization efficiency and effectively reduces damage to the packaging interface on the display panel.

[0044] The embodiments of the present invention disclosed above are merely illustrative of the invention. The embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An optical device for laser packaging, characterized in that, At least including: A laser head assembly includes a base, a rotating lens barrel, and a vision camera. A reflector group is disposed within the base. The rotating lens barrel is mounted on the base and contains a lens group, which includes a convex lens group and a concave lens group, arranged alternately. The convex lens group includes a first convex lens, a second convex lens, and a third convex lens, with the second convex lens positioned between the first and third convex lenses. The first and third convex lenses are fixed within the rotating lens barrel, allowing the rotating lens barrel to adjust the second convex lens for reciprocating movement. The concave lens group includes a first concave lens and a second concave lens, with the first concave lens fixed between the first and second convex lenses, and the second concave lens fixed between the second and third convex lenses. The vision camera is disposed side-by-side with the rotating lens barrel on the same side of the base. An optical fiber support is mounted on the base, and the optical fiber support and the vision camera are located on opposite sides of the rotating lens barrel. The optical fiber support includes a connecting plate and a support plate. The connecting plate is arranged in an inverted "L" shape. One end of the connecting plate is connected to the base, and the other end is connected to the support plate. The support plate is located in the plane containing the axis of the rotating lens barrel and has a preset distance from the rotating lens barrel. A thermometer is disposed on the surface of the base, and the thermometer and the rotating lens are disposed on adjacent surfaces of the base; as well as The output end is disposed on both sides of the base opposite to the rotating mirror tube.

2. The optical device for laser packaging according to claim 1, characterized in that, The reflector assembly includes a first reflector located between the output end and the rotating mirror tube, and the angle between the axis of the first reflector and the axis of the rotating mirror tube is 45°.

3. An optical device for laser packaging according to claim 2, characterized in that, The mirror assembly includes a second mirror, which is arranged parallel to the first mirror and is located at the bottom of the vision camera. Visible light enters the vision camera from the second mirror.

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