CN113763830A - Display module and LED display screen - Google Patents

Display module and LED display screen Download PDF

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Publication number
CN113763830A
CN113763830A CN202110961472.3A CN202110961472A CN113763830A CN 113763830 A CN113763830 A CN 113763830A CN 202110961472 A CN202110961472 A CN 202110961472A CN 113763830 A CN113763830 A CN 113763830A
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light
layer
emitting unit
display module
protective layer
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CN113763830B (en
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徐梦梦
石昌金
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Shenzhen Absen Optoelectronic Co Ltd
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Shenzhen Absen Optoelectronic Co Ltd
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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

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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Health & Medical Sciences (AREA)
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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. 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.

Description

Display module and LED display screen
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 screen is mainly divided into two categories, namely a Light Emitting Diode (LED) display screen and a Liquid Crystal Display (LCD). Among them, the liquid crystal display is mainly used for digital watches and many portable computers. An LED display (LED display) is a device that is composed of small LED module panels and is used to display various information such as text, images, video, and the like. The LED electronic display screen integrates the microelectronic technology, the computer technology and the information processing, and has the advantages of bright color, wide dynamic range, high brightness, long service life, stable and reliable work 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 the relatively common stock exchange and financial information display, airport flight dynamic information display, port and station passenger guide information display, stadium information display, road traffic information display, dispatching command center information display in the service fields of electric power dispatching, dynamic vehicle tracking and the like, business propaganda information display in the service fields of shopping malls and the like, advertising media products and the like.
Nowadays, LED display screen products are increasingly used in public places such as shopping malls, airports, train stations, stages, gymnasiums, hospitals, buildings and the like. The safety problem of the LED display screen is also receiving much attention. In the past, a plurality of LED display screen fires at home and abroad sound the alarm clock for the whole LED industry, and the fireproof and flame-retardant technology of the LED display screen becomes the key point of industry attention.
The related fire risks of the LED display screen are divided into two types, the first type is that the LED display screen can become a heat source to ignite surrounding combustible materials due to overload, component failure, insulation breakdown, poor contact, arcing and the like in the using process, so that the fire risk is caused. The second is that the LED display screen itself contains a large amount of combustible materials, and when a fire breaks out 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 mainstream method in the industry at present is to use high-quality electric materials, prevent the short circuit risk, install the fan additional simultaneously, set up fin or radiator etc. promote the heat dissipation of display screen, prevent the conflagration hidden danger that the high temperature leads to in the product use. The fire risk caused by the LED display screen as a heat source can be greatly solved by using the mainstream scheme. However, for the second risk, the mainstream method in the industry at present is to add a metal mask, but the metal mask has the problems of high cost, large processing difficulty, heavy weight, short circuit risk, inapplicability to a small-distance display screen and the like, and the fire hazard caused by the display screen serving as fuel cannot be effectively solved. Therefore, research is needed 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 fire hazard that the display screen arouses as fuel.
In a first aspect, an embodiment of the present application provides a display module, which includes: a 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 both free of 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 the 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 lamp beads). It should be understood that the first light emitting unit and the second light emitting unit may be other light emitting units, and the present application is not limited thereto. Because 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 the fireproof coatings, the transmission rate 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 larger. The fireproof layer is a coating layer having fireproof properties. In this application, the fire-blocking layer may be referred to as a fire-blocking coating.
In the embodiment of the application, because it has the functional coating to fill between first luminescence unit and the second luminescence unit to the upper surface of flame retardant coating is not higher than the play plain noodles of first luminescence unit, consequently can promote display module's fire behavior, can reduce the influence of flame retardant coating to display module's optical properties again.
In one possible implementation, the functional coating further comprises a transition layer and/or a protective layer; the lower surface of transition layer adheres to the upper surface of PCB, the transition layer possesses the adhesion characteristic, the lower surface of flame retardant coating adheres to the upper surface of transition layer, the lower surface of protective layer adheres to the upper surface of flame retardant coating, the protective layer possesses the weatherability. 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 the present application, the transition layer and the transition coating layer have the same meaning, and the protective layer and the protective coating layer have the same meaning.
The transition layer can promote adhesion between the functional coating and the PCB. The protective properties can improve the weatherability and reliability of the functional coating.
Optionally, the material of the transition layer is an epoxy adhesion promoter.
Optionally, the thickness of the transition layer is 10-100 μm. Therefore, 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 manner, the functional coating includes the protective layer, and an upper surface of the protective layer is not higher than a light emitting surface of the first light emitting unit. This can avoid the protective layer adversely affecting the optical performance of the light-emitting unit.
In a possible implementation manner, the functional coating includes the protective layer, and 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 the implementation mode, the protective 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; can effectively promote display module's weatherability.
In one possible implementation manner, the functional coating includes the protective layer, and the protective layer is located above the upper surface of the fire-retardant 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 fire-retardant 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 that 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, and the protective layer is located above the upper surface of the fire-retardant 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 fire-retardant 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 not equal to that of the protective layer on the upper surface of the first light-emitting unit, and the surface, far away from the fireproof layer, of the protective layer and the surface, far away from the first light-emitting unit, of the protective layer is continuous and flat.
The protective layer covers the whole module surface. Therefore, the weather resistance of the display module is further improved.
In one possible implementation, the raw materials for manufacturing the fire-retardant layer include: one or two of a first coloring agent and a first dispersing agent, and a first substrate; the first substrate is made of a flame retardant or a fireproof material, and the first diffusant has an anti-glare property.
The first color 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 color agent is added into the fire-proof layer, so that the contrast and the consistency of the black screen can be improved. The fire-proof layer has an anti-glare effect by adding the first diffusant into the fire-proof layer.
In one possible implementation, the first colorant is black inorganic particles or black organic. The first coloring agent can be black inorganic particles such as carbon black or black organic matters such as acrylic acid. In view of the dispersion effect in the first matrix, nano-scale carbon black particles or black acrylic pigments unified with the first matrix are preferable.
Optionally, the first substrate 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. Preferably intumescent flame retardants, more preferably acrylic intumescent fire protection materials.
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.
In one possible implementation, the raw material for manufacturing the protective layer includes: one or two of a second coloring agent and a second dispersing agent, and a second substrate; the second substrate has anti-corrosion characteristics, and the second diffusing agent has anti-glare characteristics or visibility angle improving characteristics.
Optionally, the second substrate is a polymer with excellent corrosion resistance, such as a polyurethane-based polymer, an acrylic polyurethane-based polymer, a fluorocarbon-based polymer or parylene.
In one possible implementation, the second colorant is black inorganic particles or black organic.
In one possible implementation, the thickness of the protective layer is 10-100 μm.
The second aspect of the present application further provides an LED display screen, where the LED display screen includes the display module according to any one of the above first aspect and possible implementation manners.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.
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 according to an embodiment of the present disclosure;
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 solely to distinguish between different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the specification of the present application 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 otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and 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 and B may be singular or plural. The term "plurality" as used in this application refers to two or more.
As described in the background, research is needed to solve the problem of fire hazard caused by the display screen as fuel. Therefore, the application provides a display module assembly that fire barrier performance is good. The application provides a display module assembly when guaranteeing fire behavior, has effectively avoided the influence to display module assembly optical property. In addition, the display module that this application provided has enlarged the selection range of fire-proof material, and is lower to preparation technology requirement. The following describes a display module provided by the present application with reference to the accompanying drawings. The display module provided by the present application is described below by taking an LED display module (which 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, 11 includes a PCB board 111 and an LED lamp 112; the functional coating 12 is a functional coating, and the functional coating 12 is filled in the gap position of each LED lamp 112 to form a continuous net 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 bead 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 exit surface of any light emitting unit. The gap position between the first and second light emitting units is filled with the functional coating 12. In the present application, an LED lamp (LED lamp bead) may be referred to as an LED light emitting unit or an LED pixel.
This application relates to the terms 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 board 111. It should be understood that since the light exit surface of LED lamp bead 12 is known, 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 retardant coating.
Exemplary, the raw materials of the fire-blocking layer include: the first base body, the first color agent and the first dispersing agent. Wherein, the weight percentage of the first substrate in the whole fireproof coating can be 70-90%, which plays a fireproof role. The raw material of the fire-proof layer may include only the first base, or may include only one of the first coloring agent and the first diffusing agent, and the first base.
The first substrate is a common polymeric flame retardant. Optionally, the first substrate 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 fire retardant material is used as the first matrix.
The first color agent accounts for 5-15 wt% of the whole fireproof coating and is used for adjusting the optical effect of the display screen, such as improving the contrast of the display screen. The first coloring agent 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 first colorant in the first matrix, carbon black particles of nanometer order 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, such as preventing the problems of glare and the like. The first diffusing agent can be common inorganic diffusing agents such as silicon dioxide, aluminum oxide or titanium dioxide. Silica is preferably used as the first diffusing agent in view of dispersibility and cost.
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 manufactured by using a common process such as Surface Mounted Devices (SMDs).
2. And (3) functional coating configuration: according to the optical performance requirement, the proportion of the substrate (namely the first substrate), the coloring agent (namely the first coloring agent) and the dispersing agent (namely the first dispersing agent) in the fireproof material is determined, and the components are mixed and then uniformly stirred (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 the modes of dispensing, blade coating, spraying or mould pressing and the like. In order to improve the adhesion between the functional coating and the PCB, the surface of the PCB can be treated by using methods such as plasma cleaning and the like before the fireproof material is filled. Then, according to the property of the fireproof material, the fireproof material is cured by thermal curing, photo-curing or moisture curing, so as to obtain the LED display module with good flame retardant property and optical property shown in fig. 1.
In this embodiment, the functional coating 12 is a single-layer fireproof coating, and the fireproof coating is located in the gap position of the LED lighting unit. Because the light-emitting surfaces of the LED light-emitting units (corresponding to the first light-emitting unit and the second light-emitting unit) are not provided with the fireproof coating, the transmittance of the fireproof coating is not strictly required, the influence of a 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 be 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 and the black screen consistency 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 of not influencing the optical performance of the display module.
Example 2
Fig. 2 is a schematic structural diagram of another LED display module according to an embodiment of the present disclosure. As shown in fig. 2, 21 denotes an LED display module including a PCB board 211 and an LED lamp 212; the functional coating 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 board 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 layer 22 has a three-layer structure including a transition layer 223, a fire-retardant layer 222, and a protective layer 221. In this application, the play plain noodles of LED lamp pearl indicates 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 fire blocking 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 fire-retardant layer 222. The LED lamp 212 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 22.
The transition layer 223 functions to increase adhesion between the functional coating and the PCB board. The material of the transition layer is preferably epoxy resin adhesion promoter, and the thickness is preferably 10-100 μm.
The fire-blocking layer 222 is preferably an intumescent fire-blocking coating with excellent fire-blocking properties. The fireproof coating can be composed of the fireproof substrate (first substrate) only, and can also comprise the first substrate, a first color agent and a first dispersing agent. The flame retardant layer 222 may be the same as that in embodiment 1, and will not be described in detail here.
The protective layer 221 is used to improve the weather resistance of the fireproof layer 222, and prevent the fireproof layer from falling off and deteriorating in a hot and humid environment. In order to improve the optical performance of the display module, the protective layer may further include a second color agent, a second diffusing agent, and the like, in addition to the base material (i.e., the second base). The second substrate has anti-corrosion properties. The base material of the protective layer can be selected from polyurethane-based polymer, acrylic polyurethane-based polymer, fluorocarbon-based polymer or polymer with excellent anti-corrosion performance such as parylene and the like. The second color agent mainly plays a role in improving the contrast ratio and the black screen consistency of the display screen. The second coloring agent may be black inorganic particles such as carbon black or black organic matter such as acrylic acid. In view of the dispersion effect of the second colorant in the matrix, carbon black particles of nanometer order or black acrylic pigment unified with the matrix are preferable. The second diffusing agent has an anti-glare property or an enhanced viewing angle property. The second diffusing agent can simultaneously have anti-glare properties and improved viewing angle properties. The second diffusant is used for adjusting the optical effect of the surface of the display screen, for example, preventing problems such as glare or improving the visual angle of the LED display module. The second diffusant can be common inorganic diffusants such as silicon dioxide, aluminum oxide or titanium dioxide. Silica is preferably used as a diffusing agent in view of dispersibility and cost. The weight percentage of the base material in the protective coating is preferably 70-100%, the weight percentage of the second colorant 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 to 100 μm.
One possible preparation method of the LED display module in the embodiment of the application is as follows:
1. preparing an LED display module: according to actual needs, common technologies such as SMD are used for manufacturing the LED lamp panel.
2. The materials of the transition layer, the fire-proof layer and the protective layer are configured as follows: and configuring the transition layer material according to the requirement of the transition layer material. According to the material properties and optical performance requirements of the fireproof layer, the proportion of the first base body, the first color agent and the first dispersing agent in the fireproof layer is determined, the components are mixed, and the fireproof layer material is obtained after uniform stirring. According to the requirements of the property and the optical performance of the protective layer material, determining the materials and the proportion of the base material (namely the second base), the second color agent and the 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 a glue dispensing or spraying mode and the like. And then, according to the property of the transition layer material, selecting a thermal curing mode, a light curing mode or a moisture curing mode and the like to cure the transition layer, so as to obtain the LED display module with the transition layer at the position of the lamp gap. And filling a fireproof layer material on the upper surface of the transition layer at the position of the lamp gap by adopting a dispensing or spraying mode and the like, and selecting a thermosetting mode, a photocuring mode or a moisture curing mode and the like to cure the fireproof layer according to the property of the fireproof layer material, so that the transition layer and the fireproof layer are formed at the position of the lamp gap. And filling a protective layer material on the upper surface of the fireproof layer at the position of the lamp gap by adopting a glue dispensing or spraying mode and the like, and curing the protective layer by selecting a thermosetting mode, a photocuring mode or a moisture curing mode and the like according to the property of the protective layer material to finally obtain the LED display module with the three-layer structure functional coating and good flame retardant property and optical property at the position of the lamp gap.
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 at the bottom layer is in contact with the PCB, the adhesion between the functional coating and the PCB can be increased, 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 light emitting unit. Because 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 fire-retardant coating has wider selection range and larger thickness. In this application, the LED light-emitting unit can refer to LED lamp pearl.
In embodiment 2, the color agent and the diffusing 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 and the consistency of black screens are improved.
The function coating of the LED display module forms a continuous network structure to separate inflammable LED lamp beads, so that the fireproof and flame-retardant properties of the display module are greatly improved on the premise of not influencing the optical performance of the display module.
Example 3
Fig. 3 is a schematic structural diagram of another LED display module according to an embodiment of the present disclosure. As shown in fig. 3, 31 indicates an LED display module, which includes a PCB311 and an LED lamp 312; and 32 is a functional coating. The functional coating is of a three-layer structure and sequentially 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 located at the lowest layer of the functional coating and is adhered to the upper surface of the PCB 311. The transition layer is preferably made of epoxy resin adhesion promoter, the thickness of the transition layer is preferably 10-100 mu m, and the transition layer 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 fire-blocking layer 322 is preferably an intumescent fire-blocking coating with excellent fire-blocking properties. The fire-retardant coating can consist of the fire-retardant matrix only; the fire-retardant coating may also include a first substrate, a first colorant, and a first dispersing agent, as described in example 1. The material of the flame retardant layer 222 may be the same as that of the flame retardant layer in embodiment 1, and will not be described in detail.
The protection layer 321 is located above the surface formed by the fire-proof layer 322 and the light-emitting surface of the LED light-emitting unit 312, forming a continuous surface, and covers the entire LED display module. Illustratively, the thickness of the protective layer 321 on the surface of the fire-proof layer 322 is the same as the thickness of the protective layer 321 on the surface of the LED light-emitting unit 312. The thickness of the protective layer 321 on the surface of the fire-retardant layer 322 may be 10 to 100 μm. The protective layer is used for improving the weather resistance of the functional coating and avoiding the problems of falling and deterioration of the fireproof layer in a damp and hot environment and the like. The base material of the protective layer can be selected from polyurethane-based polymer, acrylic polyurethane-based polymer, fluorocarbon-based polymer or polymer with excellent anti-corrosion performance such as parylene and the like. In order to improve the optical performance of the display module, the protective layer can also comprise a second color agent, a second dispersing agent and the like besides the base material. The material of the protective layer 321 may be the same as that of the flame-retardant layer 222 in embodiment 2, and will not be described again.
The LED display module in embodiment 3 is different from the LED display module in embodiment 1 in that the functional coating layer 32 has a three-layer structure including a transition layer 323, a fire-retardant layer 322 and a protective layer 321, and the protective layer 321 covers the entire surface of the LED display module. Compared with the LED display module in embodiment 2, the protective layer 321 covers the surface of the entire LED display module in embodiment 3, which further improves the weather resistance of the LED display module.
One possible preparation method of the LED display module in the embodiment of the application is as follows:
1. preparing an LED display module: according to actual needs, common technologies such as SMD are used for manufacturing the LED lamp panel.
2. The materials of the transition layer, the fire-proof layer and the protective layer are configured as follows: and configuring the transition layer material according to the requirement of the transition layer material. According to the material properties and optical performance requirements of the fireproof layer, the proportion of the first base body, the first color agent and the first dispersing agent in the fireproof layer is determined, the components are mixed, and the fireproof layer material is obtained after uniform stirring. According to the requirements of the property and the optical performance of the protective layer material, determining the materials and the proportion of the base material (namely the second base), the second color agent and the 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 a glue dispensing or spraying mode and the like. And then, according to the property of the transition layer material, selecting a thermal curing mode, a light curing mode or a moisture curing mode and the like to cure the transition layer, so as to obtain the LED display module with the transition layer at the position of the lamp gap. And filling a fireproof layer material on the upper surface of the transition layer at the position of the lamp gap by adopting a dispensing or spraying mode and the like. According to the property of the fireproof layer material, the fireproof layer is cured by selecting the modes of thermal curing, light curing or moisture curing and the like, and a transition layer and the fireproof layer are formed at the position of the lamp gap. And filling a protective layer material on the upper surface of the fireproof layer at the position of the lamp gap by adopting a dispensing or spraying mode and the like. According to the property of the protective layer material, the protective layer is cured by selecting the modes of thermal curing, light curing or moisture curing and the like, 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 position of the lamp gap 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, the LED display module 41 includes a PCB 411 and an LED lamp 412; 42 is a functional coating. The functional coating is of a three-layer structure and sequentially comprises a transition layer 423, a fireproof layer 422 and a protective layer 421 from bottom to top. The transition layer 423 is located 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 functions to improve the adhesion between the functional layer and the PCB board. 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 protection layer 421 is located above the surface formed by the fire-proof layer 422 and the light-emitting surface of the LED light-emitting unit 412 to form a flat continuous surface, and covers the entire LED display module. The thickness of the protective layer 421 may be 10-100 μm. Alternatively, the protective layer is preferably 10 to 100 μm above the surface of the LED lighting unit. This can avoid the protective layer 421 from causing a large shielding effect on the LED light emitting unit 412. The LED lamp 412 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 42.
The LED display module of embodiment 4 is different from the LED display module of embodiment 3 in that the thickness of the protective layer 421 on the surface of the fire-retardant layer 422 is different from the thickness on the surface of the LED light-emitting unit 412. The protection layer 421 fills up the height difference between the LED pixel gaps and the LED pixels, and is higher than the surface of the LED light-emitting unit, so as to form a continuous and flat surface on the light-emitting surface of the entire LED display module. In the present application, the LED pixel gap refers to a gap position between the LED light emitting units. In the present application, an LED pixel refers to an LED light emitting unit.
The preparation method of the LED display module in this embodiment refers to embodiment 3. The difference lies in that in the embodiment, a protective coating with a smooth surface is obtained on the surface of a cured fireproof layer by adopting a blade coating or mould pressing mode and the like, and then the protective layer is cured by selecting a thermal curing mode, a light curing mode or a moisture curing mode and the like according to the property 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 at the bottom layer is in contact with the PCB, the adhesion between the functional coating and the PCB can be increased, 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 fire-retardant coating is located in the gap of the LED light-emitting unit, and the light-emitting surface of the LED light-emitting unit has no fire-retardant coating, so that the transmittance of the fire-retardant coating is not strictly required, the influence of the fire-retardant material on the optical performance of the LED display module is greatly reduced, the selection range of the fire-retardant coating is wider, and the thickness of the fire-retardant coating can be larger.
Compared with the LED display module in embodiment 2, the LED display module in embodiment 4 has the advantage that the protective layer covers the whole surface of the 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 merely represent some exemplary embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

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.
2. The display module of claim 1,
the functional coating further comprises a transition layer and/or a protective layer; the lower surface of transition layer adheres to the upper surface of PCB, the transition layer possesses the adhesion characteristic, the lower surface of flame retardant coating adheres to the upper surface of transition layer, the lower surface of protective layer adheres to the upper surface of flame retardant coating, the protective layer possesses the weatherability.
3. The display module of claim 2,
the functional coating comprises the protective layer, and the upper surface of the protective layer is not higher than the light-emitting surface of the first light-emitting unit;
or,
the functional coating comprises the protective layer, and 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.
4. The display module according to claim 3, wherein the functional coating comprises the protective layer, and the protective layer is located above the upper surface of the fire-retardant 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 fire-retardant 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 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 not equal to that of the protective layer on the upper surface of the first light-emitting unit, and the surface, away from the fireproof layer and the first light-emitting unit, of the protective layer is continuous and flat.
5. The display module according to any one of claims 1 to 4, wherein the raw material for manufacturing the fire-retardant layer comprises: one or two of a first coloring agent and a first dispersing agent, and a first substrate; the first substrate is made of a flame retardant or a fireproof material, and the first diffusant has an anti-glare property.
6. The display module according to claim 5, wherein the first colorant is black inorganic particles or black organic matter.
7. The display module according to any one of claims 2 to 4, wherein the raw material for manufacturing the protective layer comprises: one or two of a second coloring agent and a second dispersing agent, and a second substrate; the second substrate has anti-corrosion characteristics, and the second diffusing agent has anti-glare characteristics or visibility angle improving characteristics.
8. The display module according to claim 7, wherein the second colorant is black inorganic particles or black organic matter.
9. The display module of claim 8, wherein the protective layer has a thickness of 10-100 μm.
10. An LED display screen comprising the display module of any one of claims 1-9.
CN202110961472.3A 2021-08-20 2021-08-20 Display module and LED display screen Active CN113763830B (en)

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CN212990567U (en) * 2020-07-31 2021-04-16 深圳市艾比森光电股份有限公司 LED display screen and face shield thereof
CN213183396U (en) * 2020-05-20 2021-05-11 深圳市艾比森光电股份有限公司 Circuit board, LED display module and LED display screen
CN113078146A (en) * 2021-03-31 2021-07-06 江西兆驰光元科技股份有限公司 LED light source, preparation method thereof and backlight module
CN113206180A (en) * 2021-04-28 2021-08-03 深圳市艾比森光电股份有限公司 LED display module and LED display screen

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0246945A1 (en) * 1986-05-20 1987-11-25 Thomson-Csf Electrooptic screen display and method for its manufacture
CN106228912A (en) * 2016-07-29 2016-12-14 上海铁歌科技有限公司 A kind of ultra-thin all-colour LED thin film display screen of Pasting
CN109004078A (en) * 2018-07-27 2018-12-14 上海天马微电子有限公司 Miniature L ED display panel, manufacturing method thereof and display device
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