CN113763830B - Display module and LED display screen - Google Patents
Display module and LED display screen Download PDFInfo
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- CN113763830B CN113763830B CN202110961472.3A CN202110961472A CN113763830B CN 113763830 B CN113763830 B CN 113763830B CN 202110961472 A CN202110961472 A CN 202110961472A CN 113763830 B CN113763830 B CN 113763830B
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0275—Security details, e.g. tampering prevention or detection
Abstract
The embodiment of the application discloses display module assembly and LED display screen, this display module assembly includes: a PCB and a first light emitting unit and a second light emitting unit disposed on the PCB; a functional coating is filled between the first light-emitting unit and the second light-emitting unit; the lower surface of the functional coating is adhered to the upper surface of the PCB, the functional coating comprises a fireproof layer, and the upper surface of the fireproof layer is not higher than the light emitting surfaces of the first light emitting unit and the second light emitting unit. The functional coating is filled between the first light-emitting unit and the second light-emitting unit, and the upper surface of the fireproof layer is not higher than the light-emitting surface of the first light-emitting unit, so that the fireproof performance of the display module can be improved, and the influence of the fireproof layer on the optical performance of the display module can be reduced.
Description
Technical Field
The application relates to the technical field of display screens, in particular to a display module and an LED display screen.
Background
The display screens are mainly divided into two major categories, namely a light emitting diode (light emitting diode, LED) display screen and a liquid crystal display screen (liquid crystal display, LCD). Among them, the liquid crystal display is mainly used for digital watches and many portable computers. An LED display screen (LED display) is a device composed of small LED module panels for displaying various information such as text, images, video, etc. The LED electronic display screen integrates microelectronic technology, computer technology and information processing, and has the advantages of bright color, wide dynamic range, high brightness, long service life, stable and reliable operation and the like. The LED display screen has the advantages of high luminous brightness, high luminous efficiency, bright color, high contrast, wide working temperature range, short response time, low energy consumption and the like, and is widely applied to the display field, such as more common stock exchange and financial information display, airport flight dynamic information display, port and station passenger guiding information display, stadium information display, road traffic information display, dispatching command center information display such as power dispatching and vehicle dynamic tracking, business propaganda information display of the service field such as a shopping mall and the like, advertisement media products and the like.
Today, LED display products are increasingly used in public places such as shops, airports, train stations, stages, stadiums, hospitals, buildings, etc. The safety problem of LED displays is also becoming a growing concern. The fire disaster of a plurality of LED display screens occurring at home and abroad in the past year knocks the alarm clock for the whole LED industry, and the fireproof and flame-retardant technology of the LED display screens becomes the focus of industry attention.
The related fire risks of the LED display screen are divided into two types, and the first is that the LED display screen possibly becomes a combustible material around the ignition of a heat source and causes fire risks due to overload, component failure, insulation breakdown, poor contact, arcing and other reasons in the use process. The second is that the LED display screen itself contains a large amount of combustible materials, and when a fire occurs in the use environment, the LED display screen can be used as fuel to accelerate the development of the fire, so that the fire risk is caused. Aiming at the first risk, the main current practice in the industry is to use high-quality electrical materials to prevent short circuit risks, additionally install fans, arrange radiating fins or radiators and the like, improve the heat dissipation of a display screen and prevent fire hazards caused by overhigh temperature in the use process of products. The main flow scheme can greatly solve the fire risk caused by taking the LED display screen as a heat source. However, aiming at the second risk, the current main current practice in the industry is to add a metal mask, but the metal mask has the problems of high cost, high processing difficulty, heavy weight, short-circuit risk and inapplicability to small-space display screens, and the like, and the hidden fire hazard caused by taking the display screens as fuel cannot be effectively solved. It is therefore necessary to study how to solve the problem of fire hazard caused by the display screen as fuel.
Disclosure of Invention
The embodiment of the application discloses display module assembly and LED display screen can solve the problem of the conflagration hidden danger that the display screen caused as fuel.
In a first aspect, an embodiment of the present application provides a display module, including: a printed circuit board (Printed Circuit Board, PCB) and first and second light emitting units disposed on the PCB; a functional coating is filled between the first light-emitting unit and the second light-emitting unit; the lower surface of the functional coating is adhered to the upper surface of the PCB, the functional coating comprises a fireproof layer, and the upper surface of the fireproof layer is not higher than the light emitting surfaces of the first light emitting unit and the second light emitting unit.
The upper surface of the fireproof layer is not higher than the light-emitting surface of the first light-emitting unit, which indicates that the light-emitting surface of the first light-emitting unit and the light-emitting surface of the first light-emitting unit are not provided with the fireproof layer. In some embodiments, the display module may include a plurality of light emitting units, a gap between any two adjacent light emitting units is filled with a functional coating, and an upper surface of the fireproof layer is not higher than a light emitting surface of any one of the light emitting units. Optionally, the first light emitting unit and the second light emitting unit are both LED lamps (or referred to as LED beads). It should be understood that the first light emitting unit and the second light emitting unit may be other light emitting units, which is not limited in this application. As the light-emitting surface of the first light-emitting unit and the light-emitting surface of the second light-emitting unit are not provided with fireproof coatings, the transmissivity of the fireproof layer is not strictly required, the influence of fireproof materials on the optical performance of the display module is greatly reduced, the selection range of the fireproof layer is wider, and the thickness of the fireproof layer can be also larger. The fireproof layer is a coating layer having fireproof characteristics. In this application, the fire-blocking layer may be referred to as a fire-blocking coating.
In this embodiment of the application, because the functional coating is filled between the first light-emitting unit and the second light-emitting unit, and the upper surface of the fireproof layer is not higher than the light-emitting surface of the first light-emitting unit, the fireproof performance of the display module can be improved, and the influence of the fireproof layer on the optical performance of the display module can be reduced.
In one possible implementation, the functional coating further comprises a transition layer and/or a protective layer; the lower surface adhesion of transition layer in the upper surface of PCB, the transition layer possesses adhesion properties, the lower surface adhesion of flame retardant coating in the upper surface of transition layer, the lower surface adhesion of protective layer in the upper surface of flame retardant coating, the protective layer possesses weather resistant characteristic. In this application, the transition layer may be referred to as a transition coating and the protective layer may be referred to as a protective coating. That is, in this application, the meaning of the transition layer and the transition coating is the same, and the meaning of the protective layer and the protective coating is the same.
The transition layer can promote adhesion between the functional coating and the PCB. The protection performance improves the weather resistance and the reliability of the functional coating.
Optionally, the material of the transition layer is an epoxy resin adhesion promoter.
Optionally, the thickness of the transition layer is 10-100 μm. Thus, the functional coating and the PCB can be ensured to have strong enough adhesion, and the excessive thickness of the transition layer is avoided.
In one possible implementation, the functional coating includes the protective layer, and an upper surface of the protective layer is not higher than the light emitting surface of the first light emitting unit. In this way, the protective layer can be prevented from adversely affecting the optical properties of the light emitting unit.
In one possible implementation manner, the functional coating includes the protective layer, where the protective layer is located above the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit, and covers the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit.
In this implementation, the protection layer covers the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit; the weather resistance of the display module can be effectively improved.
In one possible implementation manner, the functional coating includes the protective layer, where the protective layer is located above the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit, and covers the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit; the thickness of the protective layer on the upper surface of the fireproof layer is equal to the thickness of the protective layer on the upper surface of the first light-emitting unit.
In one possible implementation manner, the functional coating includes the protective layer, where the protective layer is located above the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit, and covers the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit, and the light-emitting surface of the second light-emitting unit; the thickness of the protective layer on the upper surface of the fireproof layer is unequal to the thickness of the protective layer on the upper surface of the first light-emitting unit, and the surfaces, far away from the fireproof layer and the first light-emitting unit, of the protective layer are continuously and flatly.
The protective layer covers the whole module surface. Thus, the weather resistance of the display module is further improved.
In one possible implementation, the raw materials for making the fire-resistant layer include: one or two of a first colorant and a first diffusion agent, and a first matrix; the first matrix is a flame retardant or fireproof material, and the first dispersing agent has anti-dazzle characteristics.
The first coloring agent and/or the first dispersing agent are/is added into the fireproof layer of the functional coating, so that the optical effect of the display module can be regulated and controlled. The first coloring agent is added into the fireproof layer, so that the contrast ratio and the consistency of the black screen can be improved. The first dispersing agent is added into the fireproof layer, so that the fireproof layer has an anti-dazzle effect.
In one possible implementation, the first colorant is a black inorganic particle or a black organic. The first colorant may be black inorganic particles such as carbon black or black organic substances such as acrylic acid. In view of the dispersion effect in the first matrix, carbon black particles of nano-scale or black acrylic pigment unified with the first matrix are preferable.
Optionally, the first matrix is a halogenated polymer flame retardant, a phosphorus polymer flame retardant, a nitrogen-containing polymer flame retardant, a silicon-containing polymer flame retardant, or an intumescent flame retardant. Intumescent flame retardants are preferred, and acrylic intumescent flame retardants are more preferred.
In one possible implementation, the first diffusing agent is an inorganic diffusing agent, silica, alumina, or titania. Silica is preferably used as a diffusing agent in view of dispersibility and cost problems.
In one possible implementation, the raw materials for making the protective layer include: one or two of a second color agent and a second diffusion agent, and a second matrix; the second matrix has anti-corrosion characteristics, and the second dispersing agent has anti-glare characteristics or improves visual angle characteristics.
Optionally, the second matrix is a polyurethane-based polymer, an acrylic polyurethane-based polymer, a fluorocarbon-based polymer or a polymer with excellent corrosion resistance such as parylene.
In one possible implementation, the second toner is a black inorganic particle or a black organic substance.
In one possible implementation, the protective layer has a thickness of 10-100 μm.
A second aspect of the present application further provides an LED display screen, which includes a display module as set forth in any one of the first aspect and possible implementation manners.
Drawings
In order to more clearly describe the technical solutions in the embodiments or the background of the present application, the following description will describe the drawings that are required to be used in the embodiments or the background of the present application.
Fig. 1 is a schematic structural diagram of an LED display module according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another LED display module provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another LED display module according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another LED display module according to an embodiment of the present application.
Detailed Description
The terms "first" and "second" and the like in the description, claims and drawings of the present application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the list of steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. It should also be understood that the term "and/or" as used in this application refers to and encompasses any or all possible combinations of one or more of the listed items. For example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The term "plurality" as used in this application refers to two or more.
As described in the background art, it is currently necessary to study how to solve the problem of fire hazard caused by the display screen as fuel. Therefore, the application provides a display module with good fireproof performance. The display module that this application provided has effectively avoided the influence to display module optical property when guaranteeing fire behavior. In addition, the display module provided by the application expands the selection range of fireproof materials, and has lower requirements on the preparation process. The following description is provided with the accompanying drawings to illustrate the display module provided by the application. The following describes a display module provided in the present application by taking an LED display module (may be referred to as an LED module) as an example.
Example 1
Fig. 1 is a schematic structural diagram of an LED display module according to an embodiment of the present application. As shown in fig. 1 (a), wherein 11 indicates an LED display module, and 11 includes a PCB board 111 and an LED lamp 112;12 are functional coatings, the functional coatings 12 fill in the gap locations of the respective LED lamps 112, forming a continuous network structure as shown in fig. 1 (b). The lower surface of the functional coating 12 is adhered to the upper surface of the PCB board 111, and the upper surface is not higher than the light emitting surface of the LED lamp beads 12. The LED lamp 112 includes a first light emitting unit and a second light emitting unit. The upper surface of the functional coating 12 is not higher than the light-emitting surface of any light-emitting unit. The gap locations between the first and second light emitting units are filled with a functional coating 12. In this application, an LED lamp (LED bead) may be referred to as an LED lighting unit or an LED pixel.
The present application relates to both upper and lower surfaces. Taking the LED display module in fig. 1 as an example, the light emitting surface of the LED lamp bead 12 refers to the upper surface of the LED lamp bead 12, and the lower surface of the LED lamp bead 12 contacts with the upper surface of the PCB 111. It should be appreciated that since the light exit surface of the LED light beads 12 is known, both the upper surface of the PCB and the lower surface of the functional coating referred to in this application are clear.
In some embodiments, the functional coating 12 is a single layer of a fire protection coating.
Illustratively, the raw materials of the fire-blocking layer include: a first matrix, a first coloring agent and a first dispersing agent. Wherein, the weight percentage of the first matrix in the whole fireproof coating can be 70-90%, which plays a role in fireproof. The raw material of the fireproof layer may include only the first base, or may include only one of the first colorant and the first diffusion agent, and the first base.
The first matrix is a common polymeric flame retardant. Optionally, the first matrix is a halogenated polymer flame retardant, a phosphorus polymer flame retardant, a nitrogen-containing polymer flame retardant, a silicon-containing polymer flame retardant, or an intumescent flame retardant. Intumescent flame retardants may be preferred as the first matrix. More preferably, an acrylic intumescent material is used as the first matrix.
The first colorant is present in the entire fire-resistant coating in an amount of 5% to 15% by weight and acts to adjust the optical effect of the display, for example to enhance the contrast of the display. The first colorant may be black inorganic particles such as carbon black or black organic substances such as acrylic acid. In view of the dispersing effect of the first colorant in the first matrix, carbon black particles of nanometer scale or black acrylic pigment unified with the first matrix are preferable.
The weight percentage of the first dispersing agent in the whole fireproof coating is 5-15%. The first diffusing agent is used for adjusting the optical effect of the surface of the display screen, for example, preventing the occurrence of glare and other problems. The first dispersing agent can be silica, alumina or titania and other common inorganic dispersing agents. Silica is preferably used as the first diffusing agent in consideration of dispersibility and cost problems.
One possible preparation method of the LED display module is as follows:
1. preparing an LED display module: according to actual needs, the LED lamp panel is prepared by using common processes such as surface mount technology (surface mounted devices, SMD) and the like.
2. Functional coating configuration: according to the optical performance requirement, determining the proportion of a matrix (namely a first matrix), a color agent (namely a first color agent) and a dispersing agent (namely a first dispersing agent) in the fireproof material, mixing the components, and uniformly stirring to obtain the uncured fireproof material for later use.
3. And (3) filling the uncured fireproof material obtained in the step (2) at the gap position of the LED display module by adopting modes such as dispensing, knife coating, spraying or mould pressing. In order to improve the adhesion between the functional coating and the PCB, the surface of the PCB can be treated by plasma cleaning and other methods before the fireproof material is filled. Then, according to the properties of the fireproof material, the fireproof material is cured by adopting a heat curing mode, a photo curing mode or a moisture curing mode and the like, so that the LED display module with good flame retardant property and optical property shown in the figure 1 is obtained.
In this embodiment, the functional coating 12 is a single layer of fireproof coating, and the fireproof coating is located at the gap position of the LED lighting unit. As the light-emitting surface of the LED light-emitting unit (corresponding to the first light-emitting unit and the second light-emitting unit) has no fireproof coating, the transmittance of the fireproof coating has no strict requirement, the influence of fireproof materials on the optical performance of the LED display module is greatly reduced, the selection range of the fireproof coating is wider, and the thickness of the fireproof coating can be also larger. The color agent and the dispersing agent are added into the fireproof coating, so that the optical effect of the display module can be regulated and controlled, for example, the contrast ratio and the consistency of a black screen are improved. The fireproof coating forms a continuous network structure to separate inflammable LED lamp beads, so that the fireproof flame-retardant property of the display module is greatly improved on the premise that the optical performance of the display module is not affected.
Example 2
Fig. 2 is a schematic structural diagram of another LED display module according to an embodiment of the present application. As shown in fig. 2, 21 indicates an LED display module including a PCB board 211 and an LED lamp 212;22 is a functional coating, the functional coating 22 is filled in the gap position of the LED lamp 212, the lower surface of the functional coating 22 is adhered to the upper surface of the PCB 211, and the upper surface of the functional coating 22 is not higher than the light emitting surface of the LED lamp bead 212. The LED display module in fig. 2 is different from the LED display module in fig. 1 in that the functional coating 22 has a three-layer structure including a transition layer 223, a fireproof layer 222 and a protective layer 221. In this application, the play plain noodles of LED lamp pearl is the upper surface of LED lamp pearl, and the lower surface of LED lamp pearl contacts with the upper surface of PCB board. The lower surface of the transition layer 223 is adhered to the upper surface of the PCB board 211. The lower surface of the flame retardant layer 222 is adhered to the upper surface of the transition layer 223. The lower surface of the protective layer 221 is adhered to the upper surface of the flame-retardant layer 222. The LED lamp 212 includes a first light emitting unit and a second light emitting unit. The gap locations between the first and second light emitting units are filled with a functional coating 22.
The function of the transition layer 223 is to increase the adhesion between the functional coating and the PCB board. The material of the transition layer is preferably an epoxy adhesion promoter and the thickness is preferably 10-100 μm.
The fireproof layer 222 is preferably an intumescent fireproof coating excellent in fireproof performance. The fireproof coating can be composed of a fireproof substrate (a first substrate) only, and can also comprise the first substrate, a first coloring agent and a first dispersing agent. The fireproof layer 222 may be the same as that of embodiment 1, and will not be described here.
The protection layer 221 is used for improving weather resistance of the fireproof layer 222, and avoiding problems of falling off, deterioration and the like of the fireproof layer in a damp-heat environment. In order to improve the optical performance of the display module, the protective layer may further include a second colorant, a second diffusing agent, and the like in addition to the matrix material (i.e., the second matrix). The second substrate has anti-corrosion properties. The base material of the protective layer is selected from polyurethane-based polymer, acrylic polyurethane-based polymer, fluorocarbon-based polymer or polymer with excellent corrosion resistance such as parylene. The second toner is mainly used for improving the contrast ratio and the black screen consistency of the display screen. The second colorant may be black inorganic particles such as carbon black or black organic substances such as acrylic acid. In view of the dispersion effect of the second colorant in the matrix, carbon black particles of nanometer scale or black acrylic pigment unified with the matrix are preferable. The second diffusion agent has anti-glare properties or enhances viewing angle properties. The second diffusion agent may have both antiglare properties and enhanced viewing angle properties. The second dispersing agent is used for adjusting the optical effect of the surface of the display screen, for example, preventing the occurrence of problems such as glare or improving the visual angle of the LED display module. The second dispersing agent can be silica, alumina or titanium dioxide. Silica is preferably used as a diffusing agent in view of dispersibility and cost problems. The weight percentage of the matrix material in the protective coating is preferably 70-100%, the weight percentage of the second color agent is preferably 0-15%, and the weight percentage of the second dispersing agent is preferably 0-15%. The thickness of the protective layer 221 is preferably 10-100 μm.
One possible preparation method of the LED display module in the embodiment of the present application is as follows:
1. preparing an LED display module: according to actual needs, common processes such as SMD and the like are used for preparing the LED lamp panel.
2. Transition layer, flame retardant layer and protective layer material configuration: and configuring the transition layer material according to the requirement of the transition layer material. According to the material property and optical performance requirements of the fireproof layer, determining the proportion of the first matrix, the first coloring agent and the first dispersing agent in the fireproof layer, mixing the components, and uniformly stirring to obtain the fireproof layer material. According to the material property and optical performance requirements of the protective layer, determining the materials and proportions of a matrix material (namely a second matrix), a second color agent and a second dispersing agent in the protective layer, mixing the components, and uniformly stirring to obtain the protective layer material.
3. Preparing an LED fireproof module: and (3) filling the transition layer material obtained in the step (2) at the gap position of the LED display module by adopting modes such as dispensing or spraying. And then, according to the properties of the material of the transition layer, the transition layer is cured by adopting modes such as heat curing, photo curing or moisture curing, and the like, so that the LED display module with the transition layer at the lamp gap position is obtained. And filling a fireproof layer material on the upper surface of the transition layer at the lamp gap position by adopting modes such as dispensing or spraying, and curing the fireproof layer by adopting modes such as heat curing, photo curing or moisture curing according to the properties of the fireproof layer material, wherein the transition layer and the fireproof layer are formed at the lamp gap position. And filling a protective layer material on the upper surface of the fireproof layer at the lamp gap position by adopting modes such as dispensing or spraying, and the like, and curing the protective layer by adopting modes such as thermocuring, photo-curing or moisture curing according to the property of the protective layer material to finally obtain the LED display module with good flame retardant property and optical property of the functional coating with the three-layer structure at the lamp gap position.
Compared with the LED display module in the embodiment 1, the LED display module in the embodiment 2 has the advantages that the functional coating is of a three-layer structure, the transition layer of the bottom layer is in contact with the PCB, the adhesion between the functional coating and the PCB can be improved, and the weather resistance and the reliability of the functional coating can be improved by the protective layer on the surface.
In embodiment 2, the functional coating is located at the gap position of the LED lighting unit. As the light-emitting surface of the LED light-emitting unit is not provided with the fireproof coating, the transmittance of the fireproof coating is not strictly required, and the influence of the fireproof material on the optical performance of the LED display module is greatly reduced. Thus, the fireproof coating has wider selection range and larger thickness. In this application, the LED lighting unit may refer to an LED lamp bead.
In embodiment 2, the color agent and the dispersing agent are added into the fireproof coating or the protective layer of the functional coating, so that the optical effect of the display module can be regulated and controlled, and the contrast ratio and the black screen consistency are improved.
The functional coating of the LED display module forms a continuous network structure to separate inflammable LED lamp beads, so that the fireproof flame-retardant property of the display module is greatly improved on the premise that the optical performance of the display module is not affected.
Example 3
Fig. 3 is a schematic structural diagram of another LED display module according to an embodiment of the present application. As shown in fig. 3, 31 indicates an LED display module, which includes a PCB311 and an LED lamp 312;32 is a functional coating. The functional coating is of a three-layer structure, and comprises a transition layer 323, a fireproof layer 322 and a protective layer 321 from bottom to top. The LED lamp 312 includes a first light emitting unit and a second light emitting unit. The gap position between the first light emitting unit and the second light emitting unit is filled with the functional coating 32.
The transition layer 323 is positioned at the lowermost layer of the functional coating and adhered to the upper surface of the PCB 311. The material of the transition layer is preferably epoxy resin adhesion promoter, and the thickness is preferably 10-100 μm, which is used for improving the adhesion between the functional layer and the PCB.
The fireproof layer 322 is located above the transition layer 323, and the upper surface of the fireproof layer 322 is not higher than the light emitting surface of the LED light emitting unit 312. The fireproof layer 322 is preferably an intumescent fireproof coating excellent in fireproof performance. The fire-resistant coating may consist of only a fire-resistant substrate; the fire-protective coating may also include a first substrate, a first color, a first diffusion agent, as described in example 1. The material of the fireproof layer 222 may be the same as that of the fireproof layer in embodiment 1, and will not be described here.
The protective layer 321 is located above the surface formed by the fireproof layer 322 and the light emitting surface of the LED light emitting unit 312, and forms a continuous surface covering the entire LED display module. Illustratively, the thickness of the protective layer 321 on the surface of the fireproof layer 322 is the same as the thickness of the protective layer 321 on the surface of the LED light emitting unit 312. The protective layer 321 may have a thickness of 10-100 μm on the surface of the fireproof layer 322. The protection layer has the function of improving the weather resistance of the functional coating and avoiding the problems of falling off, deterioration and the like of the fireproof layer in a damp and hot environment. The base material of the protective layer is selected from polyurethane-based polymer, acrylic polyurethane-based polymer, fluorocarbon-based polymer or polymer with excellent corrosion resistance such as parylene. In order to improve the optical performance of the display module, the protective layer may further include a second colorant, a second diffusing agent, and the like in addition to the base material. The material of the protective layer 321 may be the same as that of the fireproof layer 222 in embodiment 2, and will not be described here.
The LED display module in embodiment 3 is different from the LED display module in embodiment 1 in that the functional coating 32 has a three-layer structure, including a transition layer 323, a fireproof layer 322 and a protective layer 321, and the protective layer 321 covers the surface of the entire LED display module. Compared with the LED display module in embodiment 2, the LED display module in embodiment 3 has the advantages that the protective layer 321 covers the surface of the whole LED display module, and the weather resistance of the LED display module is further improved.
One possible preparation method of the LED display module in the embodiment of the present application is as follows:
1. preparing an LED display module: according to actual needs, common processes such as SMD and the like are used for preparing the LED lamp panel.
2. Transition layer, flame retardant layer and protective layer material configuration: and configuring the transition layer material according to the requirement of the transition layer material. According to the material property and optical performance requirements of the fireproof layer, determining the proportion of the first matrix, the first coloring agent and the first dispersing agent in the fireproof layer, mixing the components, and uniformly stirring to obtain the fireproof layer material. According to the material property and optical performance requirements of the protective layer, determining the materials and proportions of a matrix material (namely a second matrix), a second color agent and a second dispersing agent in the protective layer, mixing the components, and uniformly stirring to obtain the protective layer material.
3. Preparing an LED fireproof module: and (3) filling the transition layer material obtained in the step (2) at the gap position of the LED display module by adopting modes such as dispensing or spraying. And then, according to the properties of the material of the transition layer, the transition layer is cured by adopting modes such as heat curing, photo curing or moisture curing, and the like, so that the LED display module with the transition layer at the lamp gap position is obtained. And filling a fireproof layer material on the upper surface of the transition layer at the lamp gap position by adopting modes such as dispensing or spraying. According to the property of the fireproof layer material, the fireproof layer is cured by adopting a heat curing mode, a light curing mode or a moisture curing mode and the like, and a transition layer and the fireproof layer are formed at the position of the lamp gap. And filling protective layer materials on the upper surface of the fireproof layer at the lamp gap position by adopting modes such as dispensing or spraying. According to the property of the protective layer material, the protective layer is cured by adopting modes such as heat curing, photo curing or moisture curing, and finally the LED display module with good flame retardant property and optical property of the functional coating with the three-layer structure at the lamp gap position is obtained.
Example 4
Fig. 4 is a schematic structural diagram of another LED display module according to an embodiment of the present application. As shown in fig. 4, 41 indicates an LED display module, and the LED display module 41 includes a PCB 411 and an LED lamp 412;42 are functional coatings. The functional coating is of a three-layer structure, and comprises a transition layer 423, a fireproof layer 422 and a protective layer 421 from bottom to top. The transition layer 423 is positioned at the lowest layer of the functional coating, is adhered to the upper surface of the PCB, and has a thickness of preferably 10-100 μm, and serves to promote adhesion between the functional layer and the PCB. The fireproof layer 422 is located above the transition layer 423, and the upper surface of the fireproof layer 422 is not higher than the light emitting surface of the LED light emitting unit 412. The protective layer 421 is located above the surface formed by the fireproof layer 422 and the light emitting surface of the LED light emitting unit 412, and forms a smooth continuous surface, covering the entire LED display module. The thickness of the protective layer 421 may be 10-100 μm. Alternatively, the protective layer is preferably 10-100 μm higher than the surface of the LED lighting unit. This can avoid the protective layer 421 from causing a large shielding effect on the LED lighting unit 412. The LED lamp 412 includes a first light emitting unit and a second light emitting unit. The gap locations between the first and second light emitting units are filled with a functional coating 42.
The LED display module in embodiment 4 is different from the LED display module in embodiment 3 in that the thickness of the protective layer 421 on the surface of the fireproof layer 422 and the thickness on the surface of the LED light emitting unit 412 are different. The protective layer 421 fills up the height difference between the LED pixel gap and the LED pixel, and is higher than the surface of the LED light emitting unit, and finally forms a continuous and flat surface on the light emitting surface of the entire LED display module. In this application, the LED pixel gap refers to a gap position between LED light emitting units. In this application, an LED pixel refers to an LED light emitting unit.
The method for manufacturing the LED display module in this embodiment refers to embodiment 3. The difference is that in this embodiment, a protective coating with a flat surface is obtained on the surface of the cured fireproof layer by means of knife coating or die pressing, and then the protective layer is cured by means of thermal curing, photo curing, moisture curing, or the like according to the properties of the protective layer material.
Compared with the LED display module in the embodiment 1, the LED display module in the embodiment 4 has the advantages that the functional coating is of a three-layer structure, the transition layer of the bottom layer is in contact with the PCB, the adhesion between the functional coating and the PCB can be improved, and the weather resistance and the reliability of the functional coating can be improved by the protective layer on the surface.
In embodiment 4, the fireproof coating is located at the gap position of the LED light emitting unit, and the light emitting surface of the LED light emitting unit has no fireproof coating, so that the transmittance of the fireproof coating has no strict requirement, the influence of the fireproof material on the optical performance of the LED display module is greatly reduced, the selection range of the fireproof coating is wider, and the thickness of the fireproof coating can also be larger.
Compared with the LED display module in the embodiment 2, the LED display module in the embodiment 4 has the advantage that the protection layer covers the surface of the whole LED display module, so that the weather resistance of the LED display module is further improved. The protective layer covers the surface of the whole LED display module, and a dispersing agent or a color agent can be added into the protective layer, so that the optical performance and consistency of the LED display module can be regulated and controlled.
The above examples only represent a few exemplary embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (8)
1. A display module, comprising:
a PCB and a first light emitting unit and a second light emitting unit disposed on the PCB; a functional coating is filled between the first light-emitting unit and the second light-emitting unit;
the lower surface of the functional coating is adhered to the upper surface of the PCB, the functional coating comprises a fireproof layer, and the upper surface of the fireproof layer is not higher than the light emitting surfaces of the first light emitting unit and the second light emitting unit;
the functional coating comprises a protective layer, wherein the protective layer is positioned above the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit and the light-emitting surface of the second light-emitting unit and covers the upper surface of the fireproof layer, the light-emitting surface of the first light-emitting unit and the light-emitting surface of the second light-emitting unit; the raw materials for manufacturing the protective layer comprise: one or two of a second color agent and a second diffusion agent, and a second matrix; the second matrix has anti-corrosion characteristics, and the second dispersing agent has anti-glare characteristics or improves visual angle characteristics.
2. The display module assembly of claim 1, wherein the display module assembly comprises,
the functional coating further comprises a transition layer; the lower surface adhesion of transition layer in the upper surface of PCB, the transition layer possesses adhesion properties, the lower surface adhesion of flame retardant coating in the upper surface of transition layer, the lower surface adhesion of protective layer in the upper surface of flame retardant coating, the protective layer possesses weather resistant characteristic.
3. The display module assembly of claim 1, wherein the display module assembly comprises,
the thickness of the protective layer on the upper surface of the fireproof layer is equal to that of the protective layer on the upper surface of the first light-emitting unit;
or the thickness of the protective layer on the upper surface of the fireproof layer is unequal to the thickness of the protective layer on the upper surface of the first light-emitting unit, and the surfaces, far away from the fireproof layer and the first light-emitting unit, of the protective layer are continuously flat.
4. A display module according to any one of claims 1 to 3, wherein the raw materials for making the fire-resistant layer comprise: one or two of a first colorant and a first diffusion agent, and a first matrix; the first matrix is a flame retardant or fireproof material, and the first dispersing agent has anti-dazzle characteristics.
5. The display module of claim 4, wherein the first colorant is black inorganic particles or black organic matter.
6. The display module of claim 1, wherein the second colorant is black inorganic particles or black organic matter.
7. The display module of claim 6, wherein the protective layer has a thickness of 10-100 μm.
8. An LED display screen comprising a display module according to any one of claims 1-7.
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