Device for vacuum printing and packaging of Mini LED backlight module

Abstract

The utility model provides a device for vacuum printing and packaging of a Mini LED backlight module. The device comprises a bottom plate, a shell, a material box, a substrate carrier, a printing steel mesh and a scraper. The shell covers the bottom plate, a vacuum cavity is formed in the shell, the material box is contained in the vacuum cavity, and the printing steel mesh is detachably installed in the material box; the substrate carrier is arranged in the material box in a lifting and sliding manner, and a positioning groove for placing a PCB is formed in the substrate carrier; the scraper is arranged above the printing steel mesh in a sliding mode, and the tail end of the scraper is coated with resin glue. The printing steel mesh comprises an outer frame and a lining, the lining is detachably arranged on the outer frame, and mesh holes and semi-carved glue hiding grooves are formed in the lining. The device can solve the problems that the dispensing speed is low and the shapes of the rubber balls are inconsistent, so that the production efficiency of the Mini LED backlight module is improved, and the light emitting consistency of the Mini LED backlight module is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of Mini LED backlight modules, and in particular to a device for vacuum printing and packaging of Mini LED backlight modules. Background Art

[0002] In the manufacturing process of Mini LED backlight modules, because the flip-chip COB packaging process does not require gold wires and brackets for packaging, it is conducive to heat dissipation and has cost advantages after scale-up. Therefore, many Mini LED backlight modules are currently manufactured using the flip-chip COB process. Backlight products using Mini LED flip chips can make the dot pitch denser. Mini LED COB backlight panels do not require lenses for secondary optical design, shortening the optical mixing distance (OD) and reducing the thickness of the entire device to achieve the goal of ultra-thinness.

[0003] At present, the application of Mini LED flip chip on backlight panel usually adopts piezoelectric valve to control the dispensing method for the packaging of light-emitting ball head. The dispensing head can only dispense one chip at a time, and the dispensing speed is slow. When the viscosity of the glue changes after a period of use, the amount of glue dispensed will change, and the shape of the ball head will be inconsistent, which will lead to the phenomenon of mixed light and inconsistent luminous angle.

[0004] Therefore, how to design a device for vacuum printing packaging of Mini LED backlight modules to solve the above-mentioned problems of slow dispensing speed and inconsistent ball head shape, thereby improving production efficiency and yield rate. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a device for vacuum printing packaging of Mini LED backlight modules to solve the above-mentioned problems of slow dispensing speed and inconsistent ball head shape, thereby improving the production efficiency of Mini LED backlight modules and ensuring their light consistency.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A device for vacuum printing and packaging of Mini LED backlight modules, comprising: a bottom plate, a housing, a material box, a substrate carrier, a printing steel mesh and a scraper;

[0008] The shell is covered on the bottom plate, and a vacuum chamber is formed inside the shell. The material box is accommodated in the vacuum chamber, and the printing steel mesh is detachably installed in the material box; the substrate carrier is arranged in the material box in a lifting and sliding manner, and a positioning groove for placing a PCB board is provided on the substrate carrier; the scraper is slidably arranged above the printing steel mesh, and the end of the scraper is coated with resin glue;

[0009] The printing steel mesh comprises an outer frame and an inner lining, wherein the inner lining is detachably arranged on the outer frame, and mesh holes and half-engraved glue storage grooves are provided on the inner lining.

[0010] In one of the embodiments, a vacuum port communicating with the vacuum chamber is provided on the shell, and the vacuum port is connected to an external vacuum pump through a pipeline.

[0011] In one of the embodiments, a sealing ring is provided between the shell and the bottom plate, a receiving groove for placing the sealing ring is provided on the bottom plate, and a holding groove cooperating with the sealing ring is provided on the shell.

[0012] In one of the embodiments, a limiting step is provided on the bottom plate, and when the shell is covered on the bottom plate, the side wall of the shell is abutted against the limiting step.

[0013] In one of the embodiments, a retaining groove is provided on the inner side wall of the material box, and retaining blocks cooperating with the retaining groove are provided at both ends of the outer frame of the printing steel mesh. The printing steel mesh is fixed in the material box through the retaining blocks and the retaining groove.

[0014] In one embodiment, the resin glue is a highly thixotropic silicone.

[0015] In one embodiment, the resin glue is added with fumed silica to adjust the viscosity.

[0016] In one of the embodiments, a visible window is provided on the shell.

[0017] In summary, the device for vacuum printing and packaging of Mini LED backlight modules of the utility model can solve the problems of slow dispensing speed and inconsistent glue ball shape, thereby improving the production efficiency of the Mini LED backlight module and ensuring its light consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the structure of the device for vacuum printing and packaging of Mini LED backlight modules of the utility model;

[0020] Figure 2 for Figure 1 An exploded schematic diagram of a device for vacuum printing packaging of a Mini LED backlight module is shown;

[0021] Figure 3 for Figure 2 A plan cross-sectional view of the printed stencil shown;

[0022] Figure 4 for Figure 1 The internal structure schematic diagram of the device for vacuum printing packaging of Mini LED backlight module shown;

[0023] Figure 5 A schematic diagram of the internal state of a device used for vacuum printing and packaging of Mini LED backlight modules during operation;

[0024] Figure 6 It is a schematic diagram of the structure of the printing steel mesh and substrate carrier;

[0025] Figure 7 A schematic diagram of the status of the printing steel mesh, substrate carrier and scraper during printing;

[0026] Figure 8 for Figure 7 An enlarged view of A is shown. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. People familiar with this technology can easily understand other advantages and effects of the utility model from the content disclosed in this specification. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right" and "middle" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the implementation of the utility model, and the change or adjustment of their relative relationship. Without substantially changing the technical content, it should also be regarded as the scope of the implementation of the utility model.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] The utility model provides a device 1 for vacuum printing packaging of Mini LED backlight modules, such as Figure 1 and Figure 2 As shown, it includes: a base plate 10 , a shell 20 , a material box 30 , a substrate carrier 40 , a printing steel screen 50 and a scraper 60 .

[0030] The housing 20 is covered on the bottom plate 10, and a vacuum chamber 21 is formed inside the housing 20 (eg Figure 4 As shown). The material box 30 is contained in the vacuum chamber 21, and the printing steel mesh 50 is detachably installed in the material box 30. The substrate carrier 40 is arranged in the material box 30 in a manner that it can be raised and lowered and slidably slidable, and a positioning groove 41 for placing the PCB board 2 (Mini LED backlight board) is provided on the substrate carrier 40. The scraper 60 is slidably arranged above the printing steel mesh 50, and the end of the scraper 60 is coated with a resin glue 70 (such as Figure 8 shown).

[0031] Moreover, if Figure 2 and Figure 3 As shown, the printing steel mesh 50 includes an outer frame 51 and an inner lining 52 . The inner lining 52 is detachably arranged on the outer frame 51 . Meanwhile, mesh holes 53 and half-engraved glue storage grooves 54 are provided on the inner lining 52 .

[0032] Preferably, the housing 20 is provided with an air extraction port 22 (such as Figure 2 The vacuum port 22 is connected to an external vacuum pump (not shown) through a pipeline. When in use, the vacuum pump forms a negative pressure (vacuuming) in the vacuum chamber 21, and the working air pressure in the vacuum chamber 21 is maintained at -0.1Mpa.

[0033] Preferably, a latching groove 31 (such as Figure 2 As shown), both ends of the outer frame 51 of the printing steel mesh 50 are provided with a clamping block 55 (as shown in FIG. Figure 3 As shown), the printing steel mesh 50 is fixed in the material box 30 through the clamping block 55 and the clamping groove 31.

[0034] In this embodiment, if Figure 4 As shown, a sealing ring 80 is provided between the housing 20 and the bottom plate 10, a receiving groove 11 for placing the sealing ring 80 is provided on the bottom plate 10, and a pressing groove 23 matching with the sealing ring 80 is provided on the housing 20. When the housing 20 is covered on the bottom plate 10, the sealing ring 80 is accommodated in the pressing groove 23 and the receiving groove 11. Due to the pressure, the sealing ring 80 will be slightly deformed to fill the gap between the pressing groove 23 / the receiving groove 11, thereby playing a sealing role.

[0035] Next, in combination with the above structure, the working principle of the device 1 for vacuum printing and packaging of Mini LED backlight modules of the present invention is described:

[0036] It should be noted in advance that the device 1 of the present invention omits some mechanical drive modules, which are used to drive the substrate carrier 40, the printing steel mesh 50 and the scraper 60 to perform corresponding actions. These drive modules belong to the prior art known to those skilled in the art, so they will not be described in detail in the present invention;

[0037] When working, first, Figure 4 As shown, the printed steel mesh 50 is clamped to the clamping groove 31 of the material box 30, and the PCB board 2 of the Mini LED backlight module is placed in the positioning groove 41 of the substrate carrier 40 (as shown in FIG. Figure 6 As shown), apply resin glue 70 at the end of the scraper 60 or the edge of the printing steel mesh 50;

[0038] Subsequently, the shell 20 is covered on the bottom plate 10, and the material box 30, the printing steel mesh 50 and the scraper 60 are all accommodated in the vacuum chamber 21. The vacuum pump is started to form a vacuum environment in the vacuum chamber 21. Next, the substrate carrier 40 rises until it fits under the printing steel mesh 50. At this time, the PCB board 2 cooperates with the lining 52 of the printing steel mesh 50, and the LED lamp beads on the PCB board 2 correspond to the mesh holes 53 one by one; at the same time, there is a half-engraved glue storage groove 54 between two adjacent mesh holes 53. Then, the scraper 60 descends and fits above the printing steel mesh 50, and then the scraper 60 moves horizontally (such as Figure 5 and Figure 7 As shown in FIG. 1 ), the end of the resin glue 70 will push the resin glue 70 to scrape the inner lining 52 of the printing steel mesh 50. In this way, the resin glue 70 can be quickly filled into a plurality of mesh holes 53 (as shown in FIG. Figure 8 As shown), the resin glue 70 covers the LED lamp beads on the PCB board 2;

[0039] After standing for a period of time, the substrate carrier 40 is lowered to separate the PCB board 2 from the printing steel mesh 50 (ie, the PCB board 2 is demoulded), and then the housing 20 is lifted to remove the PCB board 2 from the substrate carrier 40 .

[0040] It should be emphasized that the printing steel mesh 50 of the present invention has the following characteristics and beneficial effects:

[0041] First, the printed steel mesh 50 is provided with mesh holes 53 and half-engraved glue storage grooves 54. When the scraper 60 drives the resin glue 70 to scrape across the printed steel mesh 50, part of the resin glue 70 fills into the mesh holes 53. If the amount of resin glue 70 is too much, the excess resin glue 70 will infiltrate into the half-engraved glue storage grooves 54 between the mesh holes 53, thereby avoiding overflow. In this way, the size and height of the resin glue 70 covering each LED lamp bead can be ensured to be consistent, thereby ensuring the consistency of the LED lamp bead when emitting light (light consistency);

[0042] Secondly, the printing steel mesh 50 adopts a split design and can be separated into an outer frame 51 and an inner lining 52. In this way, when printing different types of PCB boards 2, only the inner lining needs to be replaced to re-match the printing steel mesh 50, which can improve the compatibility of the printing steel mesh 50; when the inner lining 52 needs to be cleaned, the staff can quickly replace it without affecting the production progress; when the inner lining 52 is damaged, the staff only needs to replace the inner lining 52, and the outer frame 51 of the printing steel mesh 50 can continue to be used, thereby reducing consumables.

[0043] In one embodiment, the resin glue 70 is a highly thixotropic silicone. Preferably, fumed silica is added to the resin glue 70, so that the viscosity of the resin glue 70 can be adjusted to make it adhere better to the PCB board 2.

[0044] Preferably, the bottom plate 10 is provided with a limiting step 12 (such as Figure 2 When the housing 20 is covered on the bottom plate 10, the side wall of the housing 20 abuts against the limiting step 12. The setting of the limiting step 12 enables the gap between the housing 20 and the bottom plate 10 to form a curved channel, which can better achieve a sealing effect.

[0045] Preferably, a visual window (not shown) is provided on the housing, and the visual window can facilitate the staff to observe the operation of the substrate carrier 40 and the scraper 60 in the vacuum chamber 21 .

[0046] In summary, the device 10 for vacuum printing packaging of Mini LED backlight modules of the utility model can solve the problems of slow dispensing speed and inconsistent glue ball shape, thereby improving the production efficiency of the Mini LED backlight module and ensuring its light consistency.

[0047] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A device for vacuum printing packaging of Mini LED backlight modules, characterized in that: include: Bottom plate, housing, material box, substrate carrier, printing steel mesh and scraper; The shell is covered on the bottom plate, and a vacuum chamber is formed inside the shell. The material box is accommodated in the vacuum chamber, and the printing steel mesh is detachably installed in the material box; the substrate carrier is arranged in the material box in a lifting and sliding manner, and a positioning groove for placing a PCB board is provided on the substrate carrier; the scraper is slidably arranged above the printing steel mesh, and the end of the scraper is coated with resin glue; The printing steel mesh comprises an outer frame and an inner lining, wherein the inner lining is detachably arranged on the outer frame, and mesh holes and half-engraved glue storage grooves are provided on the inner lining.

2. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 1, characterized in that: The shell is provided with an air extraction port which is in communication with the vacuum chamber, and the air extraction port is connected to an external air extraction pump through a pipeline.

3. The device for vacuum printing packaging of Mini LED backlight module according to claim 1, characterized in that: A sealing ring is arranged between the shell and the bottom plate, a receiving groove for placing the sealing ring is arranged on the bottom plate, and a pressing groove matched with the sealing ring is arranged on the shell.

4. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 3, characterized in that: The bottom plate is provided with a limiting step. When the shell is covered on the bottom plate, the side wall of the shell abuts against the limiting step.

5. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 1, characterized in that: A clamping groove is provided on the inner side wall of the material box, and clamping blocks cooperating with the clamping groove are provided at both ends of the outer frame of the printing steel mesh. The printing steel mesh is fixed in the material box through the clamping blocks and the clamping groove.

6. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 1, characterized in that: The resin glue is highly thixotropic silica gel.

7. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 1, characterized in that: The resin glue is added with fumed silica for adjusting viscosity.

8. The device for vacuum printing and packaging of Mini LED backlight modules according to claim 1, characterized in that: The shell is provided with a visual window.

Images