Novel small-spacing display screen outdoor protection structure
By setting up an L-shaped groove on the plastic shell of the LED display screen and filling the epoxy resin layer, and adding a coating layer thereon to form a sealed protective structure, the problem that epoxy resin cannot be effectively protected in a long-term water-soaked environment in the prior art is solved, and efficient waterproofing performance and long-term stable operation are achieved.
Patent Information
- Application Number
- CN202421240074.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In the prior art, although epoxy resin has good water resistance, due to its macromolecular structure and certain water absorption, it cannot effectively protect the LED display screen in an environment where water is soaked for a long time.
Using a combined structure of a plastic shell and an LED circuit board, a sealed protective structure is formed by setting an L-shaped groove on the shell and filling a resin layer, and adding a coating layer to the resin layer.
It is achieved that the display screen can still be used normally under long-term soaking in water with a 5% industrial salt concentration, meets the IPX7 protection level, and maintains normal operation in a long-term soaked water environment.
Smart Images
Figure CN222602790U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel outdoor protective structure and a protective method for a small-pitch display screen, belonging to the technical field of outdoor display screens. Background Art
[0002] At present, most outdoor LED screens use silicone potting to achieve IP65 protection level. However, in special application environments, such as when water continues to flow over the surface of the screen or the screen is soaked in water, conventional silicone has a water absorption rate of about 10%. After a period of time, water vapor will invade the LED circuit board, causing the screen to appear partially flowery or black, affecting the normal use of the screen. Therefore, the silicone protection method is not suitable for screens under special use conditions. Subsequently, display screen products using GOB protection method appeared. Although epoxy resin has good waterproof properties, it still has a certain water absorption rate, and the water absorption rate is usually 0.1% to 0.5%. Because epoxy resin is a macromolecular structure, the gap between molecules is large, and water molecules will slowly penetrate after long-term immersion, so it does not have the protection ability of long-term immersion in water. Utility Model Content
[0003] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0004] In view of the following technical problems in the prior art: although epoxy resin has good waterproof properties, it still has a certain water absorption rate, and the water absorption rate is usually 0.1% to 0.5%. Because epoxy resin has a large molecular structure and the gaps between molecules are large, water molecules will slowly penetrate after being soaked for a long time, so it does not have the ability to protect against long-term soaking in water.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a novel outdoor protective structure for a small-pitch display screen, comprising a plastic shell and an LED circuit board, wherein the LED circuit board is arranged in the plastic shell, an L-shaped groove is provided on the plastic shell, a resin layer is poured in the L-shaped groove, and a coating layer is provided on the resin layer.
[0006] As a preferred technical solution for a novel outdoor protective structure of a small-pitch display screen, a wave rib is provided at the bottom of the L-shaped groove.
[0007] As a preferred technical solution for an outdoor protective structure of a novel small-pitch display screen, the coating layer is made of parylene material, and the resin layer is made of epoxy resin material.
[0008] As a preferred technical solution for a novel outdoor protective structure of a small-pitch display screen, the plastic shell includes a square shell body, a square groove is opened in the middle of the square shell body, and a plurality of horizontal strips and vertical strips are arranged in the square groove.
[0009] As a preferred technical solution for a novel outdoor protective structure of a small-pitch display screen, the L-shaped groove is arranged on the side of the square shell body close to the LED circuit board, and a square sealing ring is arranged on the side of the square shell body away from the LED circuit board.
[0010] As a preferred technical solution for a novel outdoor protective structure of a small-pitch display screen, the square groove is filled with a silicone layer.
[0011] It can be seen from the above technical solution that the utility model has at least the following advantages and positive effects:
[0012] 1. The plastic shell is grooved and provided with wavy ribs around it, which can increase the firmness of the connection between the epoxy resin and the shell, and at the same time slow down the speed of water vapor intrusion from the gap between the shell and the epoxy resin, making it more difficult for water vapor to intrude into the LED circuit board;
[0013] 2. The epoxy resin completely wraps the front, sides, bottom and surrounding of the LED circuit board, and finally performs a coating process. The film thickness is 25um, which is 5 times the conventional film thickness, and solves the color difference problem caused by the increase in film thickness;
[0014] 3. The molecular structure of epoxy resin is large, while the molecular structure of the membrane material parylene is small. A layer of membrane is attached on the epoxy resin. The membrane layer is deposited by countless layers of nanostructured monomers and there are strong molecular bonds between the membrane layers, which can form a high-density protective layer, solving the problem of water molecule penetration in the large molecular structure of epoxy resin;
[0015] 4. The display screen products produced by the above protection method can still be used normally without abnormal phenomena after being immersed in water with a concentration of 5% industrial salt for 90 days. Therefore, the products produced by this protection method can meet the IPX7 protection level and can be used normally in environmental conditions of long-term immersion in water. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:
[0017] Figure 1 It is a structural schematic diagram of the device of the utility model;
[0018] Figure 2 This is a schematic diagram of the structure of the plastic housing in the present invention, which is close to the LED circuit board;
[0019] Figure 3 This is a schematic diagram of the structure of the plastic housing in the present invention, which is away from the side of the LED circuit board;
[0020] Reference numerals: 1, plastic housing; 11, square housing body; 12, square groove; 13, horizontal long strip; 14, vertical long strip; 2, LED circuit board; 3, L-shaped groove; 4, resin layer; 5, coating layer; 6, wavy ribs; 7, square sealing ring; 8, silicone layer; DETAILED DESCRIPTION
[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.
[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.
[0024] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.
[0025] like Figures 1 to 3As shown, a novel outdoor protection structure of a small pitch display screen includes a plastic shell 1 and an LED circuit board 2. The LED circuit board 2 is arranged in the plastic shell 1. The plastic shell 1 includes a square shell body 11. A square groove 12 is opened in the middle of the square shell body 11. A plurality of horizontal long strips 13 and vertical long strips 14 are arranged in the square groove 12. The L-shaped groove 3 is arranged on the side of the square shell body 11 close to the LED circuit board 2. The square groove 12 is filled with a silicone layer 8. The plastic shell 1 is provided with an L-shaped groove 3. A resin layer 4 is poured in the L-shaped groove 3. A coating layer 5 is arranged on the resin layer 4. A square sealing ring 7 is arranged on the square shell body 11 on the side away from the LED circuit board 2. The LED circuit board 2 is arranged in the plastic shell 1, and the combination of the resin layer 4 and the coating layer 5 plays a waterproof role. The other side of the plastic shell 1 is sealed to other installation components by the square sealing ring 7 and the silicone layer 8.
[0026] Specifically, a wave rib 6 is provided at the bottom of the L-shaped groove 3L, which can increase the firmness of the connection between the epoxy resin and the shell, and at the same time slow down the speed of water vapor intrusion from the gap between the shell and the epoxy resin, making it more difficult for water vapor to intrude into the LED circuit board 2.
[0027] The coating layer 5 is made of parylene material, and the resin layer 4 is made of epoxy resin material. The epoxy resin completely wraps the front, side, bottom and surrounding of the LED circuit board 2, and is finally subjected to coating treatment. The film thickness is 25um, which is 5 times the thickness of the conventional film, and solves the color difference problem caused by the increase in film thickness. The molecular structure of epoxy resin is large, and the molecular structure of parylene, the material of the film, is small. A layer of film is attached on the epoxy resin. The film layer is formed by the deposition of countless layers of nanostructured monomers and there are strong molecular bonds between the film layers, which can form a high-density protective layer, solving the problem of water molecule penetration in the large molecular structure of epoxy resin.
[0028] Experiments involve the need for experimental methods and experimental data;
[0029] Experimental method: Place the device to be tested in a water tank, ensure that the device is completely immersed in water, add 5% industrial salt to accelerate the aging test, and soak it in water for a long period of 3 months. During this period, observe whether there is any water penetration in the device, and check whether the various functions of the device are normal.
[0030] Experimental data:
[0031] Soaking time (days) Process phenomenon recording Soaking results 30 days Display Normal normal 60 days Display Normal normal 90 days Display Normal normal
[0032] The display screen products produced by the above protection method can still be used normally without abnormal phenomena after being immersed in water with a concentration of 5% industrial salt for 90 days. Therefore, the products produced by this protection method can meet the IPX7 protection level and can be used normally under long-term water immersion conditions.
[0033] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A novel outdoor protective structure for a small pitch display screen, comprising a plastic housing (1) and an LED circuit board (2), wherein the LED circuit board (2) is arranged in the plastic housing (1), and is characterized in that: The plastic shell (1) is provided with an L-shaped groove (3), a resin layer (4) is poured into the L-shaped groove (3), and a coating layer (5) is provided on the resin layer (4).
2. The novel outdoor protection structure for small pitch display screen according to claim 1 is characterized in that: The bottom of the L-shaped groove (3) is provided with a wave rib (6).
3. The novel outdoor protection structure for small pitch display screen according to claim 1 is characterized in that: The coating layer (5) is made of parylene material, and the resin layer (4) is made of epoxy resin material.
4. The novel outdoor protection structure for small pitch display screen according to claim 1 is characterized in that: The plastic shell (1) comprises a square shell body (11), a square groove (12) is provided in the middle of the square shell body (11), and a plurality of horizontal long strips (13) and vertical long strips (14) are arranged in the square groove (12).
5. The novel outdoor protection structure for small pitch display screen according to claim 4 is characterized in that: The L-shaped groove (3) is arranged on a side of the square housing body (11) close to the LED circuit board (2), and a square sealing ring (7) is arranged on a side of the square housing body (11) away from the LED circuit board (2).
6. The novel outdoor protection structure for small pitch display screen according to claim 4 is characterized in that: The square groove (12) is filled with a silica gel layer (8).