CN112150936B

CN112150936B - LED display module and glue filling method thereof

Info

Publication number: CN112150936B
Application number: CN201910575850.7A
Authority: CN
Inventors: 林义; 赵平林; 袁贤阳; 黄映茂
Original assignee: Shenzhen Zhouming Technology Co Ltd
Current assignee: Shenzhen Zhouming Technology Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2022-12-27
Anticipated expiration: 2039-06-28
Also published as: CN112150936A

Abstract

The invention discloses an LED display module and a glue filling method thereof, and belongs to the technical field of LED display screens. The glue pouring method comprises the following steps: taking an LED lamp panel and a film, and completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film; the LED lamp panel with the film is inverted, so that the lamp surface of the LED lamp panel faces downwards; preparing a black glue solution, and filling the black glue solution into a light gap of an LED lamp panel with a thin film; placing the LED lamp panel filled with the black glue solution and provided with the film in a preset environment for curing treatment; and after the black glue solution is completely solidified, removing the film to obtain the LED display module. The encapsulation process provided by the technical scheme does not need a specific die cavity, can form a black colloid with uniform thickness between the lamp seams, does not pollute the lamp surface, and has higher stability and reliability.

Description

LED display module and glue filling method thereof

Technical Field

The invention relates to the technical field of LED display screens, in particular to an LED display module and a glue filling method thereof.

Background

At present, the conventional solution to the color difference problem of the small-spacing LED display screen is to add a black plastic mask on the surface of a module so as to improve the display contrast of the PCB while solving the color difference problem of the PCB. However, in the practical use process, it is found that the masks of these small-pitch LED display screens have the problems of high precision requirement, high production difficulty, low yield, high cost, etc., and the inkjet process proposed in the market instead of the mask process in recent years has the disadvantages of heavy smell, low efficiency and short circuit risk, and thus, the masks cannot be the mainstream solution for solving the color difference.

Disclosure of Invention

The invention mainly aims to provide an LED display module and a glue filling method thereof, and aims to solve the problems of high production difficulty, low yield, high cost and the like in the traditional color difference solution of an LED display screen.

In order to achieve the purpose, the invention provides a glue filling method of an LED display module, which comprises the following steps: taking an LED lamp panel and a film, and completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film; the LED lamp panel with the film is inverted, so that the lamp surface of the LED lamp panel faces downwards; preparing a black glue solution, and filling the black glue solution into a lamp gap of the LED lamp panel with the film; placing the LED lamp panel with the film filled with the black glue solution in a preset environment for curing treatment; and after the black glue solution is completely solidified, removing the film to obtain the LED display module.

Optionally, the step of completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film specifically includes: the single surface of the film is provided with an adhesive layer, and the surface of the film provided with the adhesive layer is preliminarily attached to the lamp surface of the LED lamp panel; roll extrusion through the cylinder the film does not have the one side of glue film makes the film has the one side of glue film is laminated completely on the lamp face of LED lamp plate, obtains take the LED lamp plate of film.

Optionally, the roller is of a smooth structure or the surface of the roller is provided with convex teeth at equal intervals, the interval between every two convex teeth is greater than or equal to the width of the LED lamp beads on the lamp surface, and the width of the convex teeth is less than or equal to the width of the lamp seam.

Optionally, the step of completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film further includes: the back of the LED lamp panel with the film is completely sealed by the adhesive tape, so that the adhesive liquid cannot permeate into the back to pollute electronic components in the subsequent adhesive filling process.

Optionally, the black glue solution comprises transparent glue and black dye; the transparent glue comprises any one of epoxy resin, organic silicon resin, phenolic resin and alkyd resin; the black dye comprises any one of black ink, melanin and black iron oxide.

Optionally, the step of preparing the blackgel solution comprises: mixing the transparent glue and the black dye, and ensuring that the mass fraction of the black dye in the black glue solution is 0.5-5%; and (3) uniformly mixing the transparent glue and the black dye, and then carrying out mechanical dispersion to obtain the black glue solution.

Optionally, the step of inverting the LED lamp panel with the film so that the lamp surface of the LED lamp panel faces downward includes: a rectangular frame is taken, the LED lamp panel lamp surface with the film is arranged in the rectangular frame in an inverted mode, and a gap is reserved between the outer side of the LED lamp panel and the inner wall of the rectangular frame.

Optionally, the step of filling the sealant solution into the light slit of the LED lamp panel with the film specifically includes: and pouring the black glue solution into the rectangular frame along one side at a constant speed, ensuring that the liquid level of the black glue solution in the rectangular frame is not lower than the lamp surface height of the LED lamp plate with the film, and meanwhile, the liquid level does not overflow the back surface of the LED lamp plate with the film so as to fill all lamp seams of the lamp surface of the LED lamp plate with the film.

In addition, in order to achieve the purpose, the invention further provides an LED display module which comprises an LED lamp panel, wherein the LED lamp panel comprises a lamp panel layer and a lamp surface layer, the lamp surface layer comprises a plurality of LED lamp beads and black colloid, the LED lamp beads are regularly arranged on the lamp panel layer, and the black colloid is sealed and filled in all lamp gaps among the LED lamp beads through the glue filling method.

Optionally, the surface of the black colloid is flush with the surfaces of the LED lamp beads.

In addition, in order to achieve the purpose, the invention further provides an LED display module which comprises an LED lamp panel, wherein the LED lamp panel comprises a lamp panel layer and a lamp surface layer, the lamp surface layer comprises a plurality of LED lamp beads and a black colloid, the LED lamp beads are regularly arranged on the lamp panel layer, the black colloid is filled in all lamp gaps among the LED lamp beads in a sealing mode, and the surface of the black colloid is not higher than the surfaces of the LED lamp beads.

According to the LED display module and the glue filling method thereof, when the LED display module is prepared by glue filling of the LED lamp panel, a film is firstly attached to the lamp surface of the LED lamp panel, so that the LED lamp panel with the film is obtained. Then, the LED lamp panel is inverted, so that the lamp surface of the LED lamp panel faces downwards, the prepared sealant solution is filled into the lamp gap of the LED lamp panel with the film, and the sealant solution can be prevented from polluting the lamp surface due to the protection of the film. And then, placing the LED lamp panel filled with the black glue solution and provided with the film in a preset environment for curing treatment so as to ensure that the black glue formed by solidification of the black glue solution is uniform in thickness and free of bubbles. And finally, after the black glue solution is completely solidified, removing the film to obtain the required LED display module. Therefore, according to the technical scheme, the method of sticking the film and filling the black glue is used as a solution for eliminating the color difference of the PCB and improving the contrast ratio of the LED display screen, compared with the traditional face mask process, the method has the advantages of high contrast ratio, good consistency, low cost and the like, and the filling process provided by the technical scheme does not need a specific die cavity, can form the black glue with uniform thickness between the lamp seams, cannot pollute the lamp surface, and has higher stability and reliability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a flow chart of a glue filling method of an LED display module according to an embodiment of the present invention.

Fig. 2 is a detailed flowchart of step S110 of the glue filling method for the LED display module shown in fig. 1.

Fig. 3 is a first schematic view illustrating a glue filling process of an LED display module according to an embodiment of the invention.

Fig. 4 is a schematic diagram illustrating a glue filling process of an LED display module according to an embodiment of the invention.

Fig. 5 is a detailed flowchart of step S130 of the glue filling method for the LED display module shown in fig. 1.

Fig. 6 is a schematic structural diagram of a second LED display module according to an embodiment of the invention.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1, an embodiment of the present invention provides a glue filling method for an LED display screen, which specifically includes the following steps:

step S110: and taking an LED lamp panel and a film, and completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film.

Specifically, as shown in fig. 2, the specific process of executing the step "completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film" includes:

step S111: the single surface of the film is provided with the glue layer, and the surface of the film with the glue layer is preliminarily attached to the lamp surface of the LED lamp panel.

Step S112: the side of the film without the glue layer is rolled by the roller, so that the side of the film with the glue layer is completely attached to the lamp surface of the LED lamp panel, and the LED lamp panel with the film is obtained.

Step S113: the back of the LED lamp panel with the film is completely sealed by the adhesive tape, so that the adhesive liquid cannot penetrate into the back to pollute electronic components in the subsequent adhesive filling process.

As shown in fig. 3 and 4, an LED lamp panel 100 is taken, the LED lamp panel 100 includes a lamp surface, the lamp surface is composed of a plurality of LED lamp beads 111 distributed in a matrix, and before the lamp surface is attached, the lamp surface of the LED lamp panel 100 needs to be cleaned by alcohol and non-woven fabric, so as to ensure that the lamp surface of the LED lamp panel 100 is smooth. And then, taking a flat film 200 with adhesive on one side, wherein the film 200 can be a transparent adhesive tape, aluminum foil paper, a PC film, a PET film or a plastic film, and the single side of the film is required to be provided with an adhesive layer, the thickness of the film 200 is 0.1-0.5mm, the length of the film is not shorter than the length of the small-spacing LED lamp panel 100 plus 5cm, and the width of the film is not shorter than the width of the small-spacing LED lamp panel 100 plus 5cm. After the surface 210 of the film 200 with the adhesive layer is preliminarily attached to the lamp surface of the cleaned LED lamp panel 100, the surface of the film 200 without the adhesive layer is rolled by a roller (not shown), so that the surface 210 of the film 200 with the adhesive layer is completely attached to the lamp surface of the LED lamp panel 100, and the LED lamp panel 100 with the film 200 is obtained. Wherein, this cylinder is smooth structure or the surface is provided with equidistant dogtooth, and the interval between two liang of dogteeth is greater than or equal to the width of the LED lamp pearl 111 of lamp face. The width of the convex teeth is smaller than or equal to the width of the lamp slot (namely the distance between every two adjacent LED lamp beads 111), and the height of the convex teeth is 0.1-1mm. The one side that does not have the glue film through this film 200 of cylinder roll extrusion is in order to ensure that lamp face and this film 200 have the one side 210 of glue film to laminate completely, can realize the black colloid of different thickness at the light seam of this LED lamp plate 100 through the dogtooth of co-altitude not simultaneously. The back surface 120 of the LED lamp panel 100 with the film 200 is completely sealed by an adhesive tape (not shown), and particularly, a dam is formed around the back surface 120 of the LED lamp panel 100 with the film 200 by the adhesive tape or the back surface 120 of the LED lamp panel 100 with the film 200 is completely covered by the adhesive tape, so that it is ensured that the adhesive solution does not penetrate into the back surface 120 to pollute the electronic component in the subsequent adhesive filling process.

Step S120: the LED lamp panel with the film is inverted, so that the lamp surface of the LED lamp panel faces downwards.

Specifically, as shown in fig. 3 and 4, the inversion process specifically includes the following steps: taking a rectangular frame 300, wherein the material of the rectangular frame can be metal, plastic or silica gel, and the length of the rectangular frame is not shorter than the length of the LED lamp panel 100 plus 2cm and not longer than the length of the thin film 200; the width is not shorter than the width +2cm of the LED lamp panel 100 and not longer than the width of the film 200. Thus, after the lamp surface of the LED lamp panel 100 with the film 200 is inverted downwards in the rectangular frame 300, a gap is left between the outer side of the LED lamp panel 100 with the film 200 and the inner wall of the rectangular frame 300. Meanwhile, the length of the film 200 is not shorter than the length +5cm of the LED lamp panel 100, and the width is not shorter than the width +5cm of the LED lamp panel 100, that is, the length and the width of the film 200 are longer than the length and the width of the LED lamp panel 100, and are longer than the length and the width of the rectangular frame 300, so that the lamp surface of the LED lamp panel 100 with the film 200 is inverted downwards in the rectangular frame 300, and a plurality of grooves 11 are formed by the film 200 and the clearance between the outer side of the LED lamp panel 100 with the film 200 and the inner wall of the rectangular frame 300, so that the black glue solution can be poured in the subsequent steps conveniently. The inner wall of the rectangular frame 300 is preferably coated with a release agent, so that the LED lamp panel 100 with the film 200 can be taken out from the rectangular frame 200 better in the subsequent process.

Step S130: and preparing a black glue solution, and filling the black glue solution into the lamp gap of the LED lamp panel with the film.

Specifically, the black glue solution comprises transparent glue and black dye. The transparent glue comprises any one of epoxy resin, organic silicon resin, phenolic resin and alkyd resin. The black dye includes any one of black ink, melanin and black iron oxide. Thus, as shown in fig. 5, the step of preparing the blackgel solution includes:

step S131: mixing the transparent glue and the black dye, and ensuring that the mass fraction of the black dye in the black glue solution is 0.5-5%.

Step S132: and (3) uniformly mixing the transparent glue and the black dye, and then carrying out mechanical dispersion to obtain a black glue solution, wherein the mechanical dispersion comprises ultrasonic dispersion for 5-10min and stirring for 5-10min.

As shown in fig. 3 and 4, after the black glue solution is prepared by the above steps, the black glue solution can be poured into the rectangular frame 300 (specifically, into the film 200 and the one-side groove 11 formed by the gap between the outer side of the LED lamp panel 100 with the film 200 and the inner wall of the rectangular frame 300) along one side at a constant speed. This process, the blackgel solution is permeated to the opposite side along the light seam (the clearance between two liang of adjacent LED lamp pearls 111) by this one side of taking the LED lamp plate 100 of film 200, and simultaneously, need to ensure that the liquid level height of the blackgel solution in this rectangular frame 300 is not less than the light face height of taking the LED lamp plate 100 of film 200 (the height of LED lamp pearl 111 promptly), do not cross the back 120 of taking the LED lamp plate 100 of film 200, in order to avoid the blackgel solution can not permeate this back 120 to pollute electronic components as far as possible, finally fill in all light seams of this light face of taking the LED lamp plate 100 of film 200.

Step S140: and placing the LED lamp panel with the film filled with the black glue solution in a preset environment for curing treatment.

Specifically, as shown in fig. 4, the process of curing the LED lamp panel 100 with the film 200 filled with the black glue solution in a preset environment is as follows: the LED lamp panel 100 with the film 200 and filled with the black glue solution and the rectangular frame 300 are placed into a vacuum heating furnace together for vacuum heating treatment, at the moment, the heating temperature of the vacuum heating furnace is set to be 30-60 ℃, the vacuumizing time is set to be 5-20min, so that the fluidity of the glue solution is improved, bubbles in the black glue solution and air in a light gap (a gap between every two adjacent LED lamp beads 111) of the LED lamp panel 100 with the film 200 are fully removed, and the black glue formed by solidification of the black glue solution is uniform in thickness and free of bubbles. Then, the LED lamp panel 100 with the film 200 is taken out from the rectangular frame 300 (due to the existence of the release agent, the small-interval LED lamp panel 100 with the film 200 can be taken out from the rectangular frame 300 conveniently and better), and the LED lamp panel 100 with the film 200 is kept still for 12-24 hours at normal temperature to wait for the complete solidification of the black glue solution.

Step S150: and after the black glue solution is completely solidified, removing the film to obtain the LED display module.

Specifically, after the black glue solution is completely solidified, the film 200 may be torn off (because the back 120 of the LED lamp panel 100 with the film 200 is completely sealed by the glue strip in this embodiment, it is ensured that the glue solution does not penetrate into the back 120 to contaminate the electronic devices during the subsequent glue filling process, so that the glue strip on the back 120 of the module also needs to be torn off while the film 200 is torn off in this embodiment), and the lamp surface of the LED lamp panel 100 is cleaned by the combination of alcohol and the non-woven fabric, so as to obtain the LED display module.

Example two

As shown in fig. 6, a second embodiment of the present invention provides an LED display module 400, where the LED display module 400 includes an LED lamp panel, the LED lamp panel includes a lamp panel layer 430 and a lamp surface layer, the lamp surface layer includes a plurality of LED lamp beads 411 and a black colloid 412, the plurality of LED lamp beads 411 are regularly arranged on the lamp panel layer 430, and the black colloid 412 is filled in all lamp gaps between the LED lamp beads 411 by the glue filling method in the first embodiment or other methods. Meanwhile, when the black colloid 412 is sealed and filled, it is required to ensure that the surface of the black colloid 412 is flush with the surfaces of the LED lamp beads 411, or the surface of the black colloid 412 is not higher than the surfaces of the LED lamp beads 411. Therefore, the black colloid 412 does not form any shielding effect on the plurality of LED lamp beads 411 to pollute the lamp surface.

According to the LED display screen and the glue filling method thereof in the embodiment of the invention, when the LED display module is prepared by glue filling on the LED lamp panel, a film is firstly attached to the lamp surface of the LED display module, so that the LED lamp panel with the film is obtained. Then, the lamp surface of the LED lamp panel faces downwards through inversion processing, the prepared black glue solution is filled into the lamp gap of the LED lamp panel with the film, and the lamp surface can be prevented from being polluted by the black glue solution due to protection of the film. And then, placing the LED lamp panel filled with the black glue solution and provided with the film in a preset environment for curing treatment so as to ensure that the black glue formed by the solidification of the black glue solution has uniform thickness and no bubbles. And finally, after the black glue solution is completely solidified, removing the film to obtain the required LED display module. Therefore, according to the technical scheme, the method of film pasting and black glue filling is used as a solution for eliminating the color difference of the PCB and improving the contrast of the LED display screen, compared with the traditional mask process, the mask process has the advantages of high contrast, good consistency, low cost and the like, and the filling process provided by the technical scheme does not need a specific die cavity, can form black glue with uniform thickness between the lamp seams, does not pollute the lamp surface, and is high in stability and reliability.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims

1. The glue filling method of the LED display module is characterized by comprising the following steps of:

taking an LED lamp panel and a film, and completely attaching the film to the lamp surface of the LED lamp panel to obtain the LED lamp panel with the film;

the LED lamp panel with the film is inverted, so that the lamp surface of the LED lamp panel faces downwards;

preparing a black glue solution, and filling the black glue solution into a lamp gap of the LED lamp panel with the film;

placing the LED lamp panel with the film filled with the black glue solution in a preset environment for curing treatment;

after the black glue solution is completely solidified, removing the film to obtain an LED display module;

will the film is laminated completely on the lamp face of LED lamp plate, the step of obtaining the LED lamp plate of taking the film specifically includes: the single surface of the film is provided with an adhesive layer, and the surface of the film provided with the adhesive layer is preliminarily attached to the lamp surface of the LED lamp panel; rolling one side of the film without the glue layer by a roller to enable one side of the film with the glue layer to be completely attached to the lamp surface of the LED lamp panel, so as to obtain the LED lamp panel with the film; the back of the LED lamp panel with the film is completely sealed by the adhesive tape, so that the adhesive liquid cannot permeate into the back to pollute electronic components in the subsequent adhesive filling process.

2. The glue filling method according to claim 1, wherein the roller is of a smooth structure or is provided with equally spaced convex teeth on the surface, the distance between every two convex teeth is larger than or equal to the width of the LED lamp beads on the lamp surface, and the width of the convex teeth is smaller than or equal to the width of the lamp slits.

3. The glue filling method according to claim 1, wherein the black glue solution comprises a transparent glue and a black dye; the transparent glue comprises any one of epoxy resin, organic silicon resin, phenolic resin and alkyd resin; the black dye comprises any one of black ink, melanin and iron oxide black.

4. The glue filling method according to claim 3, wherein the step of preparing the blackgel solution comprises:

mixing the transparent glue and the black dye, and ensuring that the mass fraction of the black dye in the black glue solution is 0.5-5%;

and (3) uniformly mixing the transparent glue and the black dye, and then carrying out mechanical dispersion to obtain the black glue solution.

5. The glue filling method according to claim 1, wherein the step of inverting the LED lamp panel with the film so that the lamp surface of the LED lamp panel faces downwards comprises:

a rectangular frame is taken, the LED lamp panel lamp surface with the film is arranged in the rectangular frame in an inverted mode, and a gap is reserved between the outer side of the LED lamp panel and the inner wall of the rectangular frame.

6. The glue filling method according to claim 5, wherein the step of filling the black glue solution into the light gap of the LED lamp panel with the thin film specifically comprises the steps of:

and pouring the black glue solution into the rectangular frame along one side at a constant speed, ensuring that the liquid level of the black glue solution in the rectangular frame is not lower than the lamp surface height of the LED lamp plate with the film, and meanwhile, the liquid level does not overflow the back surface of the LED lamp plate with the film so as to fill all lamp seams of the lamp surface of the LED lamp plate with the film.

7. The LED display module is characterized by comprising an LED lamp panel, wherein the LED lamp panel comprises a lamp panel layer and a lamp surface layer, the lamp surface layer comprises a plurality of LED lamp beads and a black colloid, the LED lamp beads are regularly arranged on the lamp panel layer, and the black colloid is filled in all lamp gaps among the LED lamp beads in a sealing mode through the glue filling method according to any one of claims 1 to 6.

8. The LED display module of claim 7, wherein the surface of the black colloid is flush with the surface of the plurality of LED beads.