CN112599029A - Preparation method of LED display screen - Google Patents

Preparation method of LED display screen Download PDF

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Publication number
CN112599029A
CN112599029A CN202011357941.2A CN202011357941A CN112599029A CN 112599029 A CN112599029 A CN 112599029A CN 202011357941 A CN202011357941 A CN 202011357941A CN 112599029 A CN112599029 A CN 112599029A
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China
Prior art keywords
light
lens
pcb
plate
optical lens
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CN202011357941.2A
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Chinese (zh)
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CN112599029B (en
Inventor
康海波
陈家耀
林辰
黄志辉
黄达森
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Chainzone Technology Foshan Co Ltd
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Chainzone Technology Foshan Co Ltd
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Publication of CN112599029A publication Critical patent/CN112599029A/en
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Publication of CN112599029B publication Critical patent/CN112599029B/en
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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
    • 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
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)

Abstract

The invention discloses a preparation method of an LED display screen, which comprises the following steps: s1, providing a bottom shell, a PCB, a light insulation plate, an optical lens and a panel; s2, performing paint spraying treatment on the optical lens, and spraying the part except the light guide column on the back surface of the lens substrate into a preset color; s3, mounting the PCB on the bottom shell, and mounting the light-shielding plate on the PCB; s4, injecting the mixed glue into a glue injection groove of the light-isolating plate, and installing the optical lens on the light-isolating plate, so that the mixed glue in the glue injection groove permeates into gaps among the light-isolating plate, the bottom shell and the optical lens, and the light-isolating plate, the bottom shell and the optical lens are in sealed connection; and S5, mounting the panel on the optical lens. The LED display screen formed by the preparation method provided by the invention has the advantages of high matching precision, good sealing property, good heat dissipation effect, and good consistency and stability of the display effect.

Description

Preparation method of LED display screen
Technical Field
The invention relates to the technical field of LED display screens, in particular to a preparation method of an LED display screen.
Background
The LED display screen has the advantages of high brightness, splicing use, convenience, flexibility, high efficiency, low consumption and the like, so that the LED display screen is widely applied to large-area display, particularly the fields of sports, advertisements, finance, exhibition, traffic and the like.
The existing LED display screen is small in visual angle, so that the lens is required to be arranged above the light source, and how the lens is connected with the light-isolating plate, the PCB and the bottom shell in a sealing manner is a technical problem which needs to be solved by the existing LED display screen.
In addition, the existing lens is easy to generate light crosstalk, and the contrast of the LED display screen is influenced. Secondly, drain pan, PCB board, separate worn-out fur and lens are in order to form the overall thickness that the zonulae occludens in order to reduce the LED display screen, still need to improve the whole radiating effect of LED display screen.
Furthermore, the lens installed above the SMD light source is easy to shift, and the distance between the lens and the SMD light source is difficult to keep consistent, so that the matching precision of the LED display screen module is low, and the consistency and the stability of the display effect of the LED display screen are low.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for manufacturing an LED display screen, wherein a light-isolating plate is hermetically connected with a bottom shell and an optical lens, so that the reliability of a display is improved, the crosstalk of the optical lens is reduced, and the contrast of the LED display screen is enhanced.
The technical problem to be solved by the present invention is to provide a method for manufacturing an LED display screen, so that the LED display screen has high matching precision, good heat dissipation effect, and good consistency and stability of display effect.
In order to solve the technical problem, the invention provides a preparation method of an LED display screen, which comprises the following steps:
s1, providing a bottom shell, a PCB, a light insulation plate, an optical lens and a panel;
s2, performing paint spraying treatment on the optical lens, and spraying the part except the light guide column on the back surface of the lens substrate into a preset color;
s3, mounting the PCB on the bottom shell, and mounting the light-shielding plate on the PCB;
s4, injecting the mixed glue into a glue injection groove of the light-isolating plate, and enabling a light guide column, a lens positioning column and a lens mounting column of the optical lens to penetrate through the light-isolating plate, wherein the bottom of the lens positioning column is inserted into a positioning hole of the PCB, and the bottom of the lens mounting column is abutted against the PCB so that the light guide column is arranged above an SMD light source on the PCB, and a light outlet part of the optical lens is arranged on the light-isolating plate;
the mixed glue in the glue injection groove permeates gaps among the light-isolating plate, the bottom shell and the optical lens so as to enable the light-isolating plate to be in sealing connection with the bottom shell and the optical lens;
and S5, mounting the panel on the optical lens.
As an improvement of the above solution, the optical lens includes a lens substrate, and the lens substrate is placed on the PCB, wherein the light emitting portion is disposed on a front surface of the lens substrate, and the lens positioning post, the lens mounting post, and the light guiding post are disposed on a back surface of the lens substrate.
As an improvement of the above scheme, the bottom case comprises a bottom plate and a side plate surrounding the bottom plate, wherein the front surface of the bottom plate is provided with a first mounting column, a second mounting column and a grid protruding structure, the first mounting column is higher than the grid protruding structure, the inner side wall of the side plate is provided with a bottom plate boss, and the bottom plate boss is higher than the first mounting column;
the PCB is placed on the first mounting column and the second mounting column, and the light isolation plate is erected on the boss of the bottom plate so as to be arranged above the PCB.
As an improvement of the above scheme, the light-blocking plate comprises a light-blocking substrate, a first protrusion and a second protrusion, the light-blocking substrate is provided with a plurality of mounting areas, the first protrusion protrudes upwards from the surface of the light-blocking substrate and surrounds the mounting areas, the glue injection groove is recessed downwards along the surface of the first protrusion, and the second protrusion is arranged inside the glue injection groove;
erecting a lens substrate on the first protrusion, and enabling the second protrusion to surround the lens substrate so as to enable mixed glue in the glue injection groove to penetrate into a gap between the light isolation plate and the optical lens and a gap between the light isolation plate and the bottom plate;
and the fixing piece penetrates through the lens mounting column and the PCB and is inserted into the mounting hole of the second mounting column for fastening so as to tightly connect the bottom shell, the PCB, the light isolation plate and the optical lens.
As an improvement of the scheme, the degree of the mixed glue is 1800-2200 mPa.s.
As an improvement of the scheme, the mixed glue comprises glue A and glue B, wherein the glue A comprises hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide and black pigment, and the glue B comprises a coupling agent, a cross-linking agent, simethicone and a catalyst;
the mass ratio of the glue A to the glue B is (7-12): 1, the viscosity of the adhesive A is 2500-3500 mPa.s, and the viscosity of the adhesive B is 5-10 mPa.s.
As an improvement of the above scheme, the lens positioning column comprises a column body, a protruding latch and an insertion part, wherein the protruding latch protrudes outwards along the side wall of the column body, and the insertion part is positioned at the bottom of the column body;
inserting the inserting part into the corresponding positioning through hole of the PCB, and clamping the protruding latch on the surface of the PCB so as to enable the light guide column to have a preset distance with the SMD light source.
As an improvement of the above scheme, the back surface of the lens substrate is further provided with an annular protrusion and an annular groove, the annular protrusion protrudes outwards along the back surface of the lens substrate and surrounds the periphery of the light guide column, and the annular protrusion abuts against the light-shielding plate;
the annular groove is recessed inwards along the back surface of the lens substrate and is arranged between the light guide column and the annular protrusion.
As an improvement of the above scheme, in step S2, the painting mold is covered on the optical lens, the light guide pillar is covered, and then the material with the preset color is painted on the back surface of the lens substrate; the preset color material is black pigment or black paint.
As an improvement of the above scheme, the paint spraying mold comprises a mold substrate and a cover column, the mold substrate is provided with a connecting strip and a vacancy part, the connecting strip and the vacancy part are alternately arranged in parallel, the cover column is arranged on the connecting strip, the bottom of the cover column is provided with an accommodating cavity matched with the optical lens light guide column, and the light guide column is inserted into the accommodating cavity and covered by the cover column.
The implementation of the invention has the following beneficial effects:
according to the invention, the mixed glue is injected into the glue injection groove of the light-isolating plate, so that the mixed glue in the glue injection groove can slowly permeate into the gaps among the light-isolating plate, the bottom shell and the optical lens, the light-isolating plate, the bottom shell and the optical lens are in sealed connection, water vapor and dust are effectively prevented from entering the display, and the reliability of the display is improved.
According to the invention, the second bulge is arranged in the glue injection groove to reduce the space of the glue injection groove, so that the glue injection amount of glue is reduced, and further, the effects of improving the production efficiency and reducing the weight of the display screen are achieved. In addition, the inner side of the first bulge close to the mounting area is provided with a boss, and the boss is used for receiving the colloid which leaks downwards from a gap between the first bulge and the edge of the optical lens, so that the colloid is prevented from dripping on the PCB.
According to the invention, the optical lens is subjected to paint spraying treatment, and the parts except the light guide columns on the back surface of the lens substrate are sprayed with preset colors, so that light crosstalk among the light guide columns is effectively prevented, and the contrast of the LED display screen is enhanced.
The paint spraying mold is simple in structure, one mold can cover a plurality of light guide columns simultaneously, the paint spraying uniformity is guaranteed, and the efficiency is high.
The bottom shell is provided with a first mounting column on the front surface of a bottom plate for fixing a PCB, a bottom plate boss on the inner side wall of a side plate for fixing a light-isolating plate, and a second mounting column on the front surface of the bottom plate for fixing an optical lens, wherein a fixing piece penetrates through the PCB and is inserted into a mounting hole of the first mounting column so as to fix the PCB on the bottom shell; the fixing piece penetrates through the optical lens and the PCB and is inserted into the mounting hole of the second mounting column, and the light-isolating plate and the PCB are clamped between the optical lens and the bottom shell so as to realize tight connection of the bottom shell, the PCB, the light-isolating plate and the optical lens
According to the LED display screen, the lens positioning column penetrates through the light-insulating plate, the inserting part at the bottom of the lens positioning column is inserted into the corresponding positioning through hole of the PCB, and meanwhile, the convex latch on the lens positioning column is clamped on the surface of the PCB, so that the light guide column is arranged right above the SMD light source and keeps a certain distance, and the LED display screen has good consistency and stability of display effect.
The grid convex structure of the invention is upwards convex from the front surface of the bottom plate, thus the radiating area can be increased and the radiating effect of the bottom shell is improved. The first mounting column is higher than the grid protruding structure, so that the PCB erected on the first mounting column has a preset distance with the grid protruding structure, air flow between the PCB and the grid protruding structure can be increased, and the heat dissipation effect is further improved.
Drawings
FIG. 1 is a perspective view of a bottom housing of an LED display screen of the present invention;
FIG. 2 is a cross-sectional view of the bottom housing of the LED display screen of the present invention;
FIG. 3 is a first perspective view of an optical lens of an LED display screen according to the present invention;
FIG. 4 is a second perspective view of the optical lens of the LED display screen of the present invention;
FIG. 5 is a perspective view of an LED display screen light barrier panel of the present invention;
FIG. 6 is an enlarged view at A in FIG. 5;
FIG. 7 is a front view of the light barrier sheet of the LED display screen of the present invention;
FIG. 8 is a perspective view of the paint spray mold of the present invention;
FIG. 9 is a front view of the paint spraying mold of the present invention;
FIG. 10 is a left side view of the paint spraying mold of the present invention;
FIG. 11 is a body view of the paint spray mold of the present invention mounted on an optical lens;
fig. 12 is a schematic view of the installation of the LED display screen of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a preparation method of an LED display screen, which comprises the following steps:
s1, providing a bottom shell, a PCB, a light insulation plate and an optical lens;
referring to fig. 1 and 2, the bottom case 1 includes a bottom plate 11 and a side plate 12 surrounding the bottom plate 11, a first mounting column 111, a second mounting column 112 and a grid projection structure 113 are disposed on a front surface of the bottom plate 11, and the first mounting column 111 is higher than the grid projection structure 113.
The side plate 12 is higher than the front surface of the bottom plate 11, the bottom plate boss 21 on the inner side wall of the side plate 12 is higher than the first mounting column 111, and the bottom plate boss 21 is higher than the first mounting column 111. The first mounting post 111 protrudes upward along the front surface of the base plate 11, and is provided with a mounting hole therein.
The grid projection structure 113 of the present invention projects upwards from the front surface of the bottom plate 11, so that it can increase the heat dissipation area and improve the heat dissipation effect of the bottom shell.
Still be equipped with first reference column 114 on the front of bottom plate 11, first reference column 114 is higher than first erection column 111, still be equipped with third erection column 115 and second reference column 116 on the front of bottom plate 11, third erection column 115 is higher than first erection column 111, third erection column 115 is used for the installation panel, second reference column 116 is higher than third erection column 115.
Referring to fig. 3, the optical lens 5 includes a lens substrate 51, a lens group including an light emitting portion 53 and a light guiding pillar 54, the light emitting portion 53 being disposed on a front surface 111 of the lens substrate 51, and a lens positioning pillar 52 and a light guiding pillar 54 being disposed on a rear surface of the lens substrate 51.
Referring to fig. 4, the lens positioning pillar 52 includes a pillar 521, a protruding latch 522 and a plug portion 523, the protruding latch 522 protrudes outward along a sidewall of the pillar 521, and the plug portion 523 is located at a bottom of the pillar 521.
Preferably, a lens mounting post 55 is further disposed on the back surface of the lens substrate 51, and the lens mounting post 55 is provided with a through hole penetrating through the lens mounting post 55 and the lens substrate 51. The back of the lens substrate 51 is further provided with an annular protrusion 56, the annular protrusion 56 protrudes outwards along the back of the lens substrate 51 and surrounds the periphery of the light guide columns 54, and the annular protrusion 56 can further prevent the light guide columns 54 from being influenced and cross-talk while protecting the light guide columns 54.
Preferably, the back surface of the lens substrate 51 is further provided with an annular groove 57, the annular groove 57 is recessed inwards along the back surface of the lens substrate 51, and the annular groove 57 is arranged between the light guide pillar 54 and the annular protrusion 56. The annular groove 57 is used to separate the light guide pillar 54 and most of the lens substrate 51, so that the light incident on the light guide pillar 54 can be incident on the light path portion better, thereby affecting the light guide pillar 54 by the lens substrate 51.
In order to ensure the overall strength of the optical lens of the present invention, the lens substrate 51, the lens set and the light guide pillar 54 are integrally formed; in order to ensure the light emitting effect of the lens group, the lens group is made of transparent PC.
Referring to fig. 5 to 7, the light-shielding plate 4 includes a light-shielding substrate 41, a first protrusion 42 and a second protrusion 43, the light-shielding substrate 41 is provided with a plurality of mounting areas 411, the first protrusion 42 protrudes upward from the surface of the light-shielding substrate 41 and surrounds the mounting areas 411, the optical lens is mounted on the first protrusion 42, the first protrusion 42 is provided with a glue injection groove 421, the glue injection groove 421 is used for injecting mixed glue to hermetically connect the light-shielding plate and the optical lens, and the second protrusion 43 is disposed inside the glue injection groove 421 to reduce the space of the glue injection groove 421.
The glue injection groove 421 is recessed downward along the surface of the first protrusion 42, and the first protrusion 42 is used for bearing the edge of the optical lens 5, so that the optical lens 5 covers the mounting area 411; in the invention, the second bulge 43 is further arranged in the glue injection groove 421 to reduce the glue injection space and reduce the glue injection amount of mixed glue, thereby improving the production efficiency and reducing the weight of the display screen.
In addition, the second protrusion 43 is disposed around the edge of the optical lens 5, and can also limit the optical lens 5, so as to ensure that the mixed glue in the glue injection groove 421 can penetrate into the gap between the first protrusion 42 and the edge of the optical lens.
The depth of the glue injection groove 421 plays an important role in the sealing performance of the light isolation plate 4 and the light lens 5, and the overall weight and quality of the LED display screen. If the depth of the glue injection groove 421 is too small, the light-blocking plate 4 and the light lens 5 are easily bonded to be weak, which affects the sealing performance, and the mixed glue is easily overflowed and adhered to the light lens 5, which affects the light emitting effect; if the depth of the glue injection groove 421 is too deep, the mixed glue is wasted, the production efficiency is reduced, the cost is increased, and the weight of the LED display screen is increased. Preferably, the depth of the glue injection groove 421 is 0.3-0.8 mm. Preferably, the depth of the glue injection groove 421 is 0.4-0.6 mm.
Wherein, the first protrusion 42 is disposed between two adjacent mounting areas 411 to separate all the mounting areas 411, that is, the mixed glue is injected around the mounting areas 411 to ensure the sealing connection between the light-shielding plate 4 and the optical lens 5.
Specifically, the inner side of the first protrusion 42 close to the mounting area 411 is provided with a light-shielding plate boss 44, and the light-shielding plate boss 44 is used for receiving the mixed glue leaking downwards from the gap between the first protrusion 42 and the edge of the optical lens 5, so that the mixed glue is prevented from leaking onto the PCB. Wherein, the height of the light-shielding plate boss 44 is less than that of the first protrusion 42.
Wherein, the second protrusion 43 is higher than the glue injection groove 421 to prevent the mixed glue in the glue injection groove 421 from flooding the second protrusion 43. Specifically, the mixed glue injected into the glue injection groove 421 slowly penetrates into the gap between the first protrusion 42 and the edge of the optical lens under the blocking of the second protrusion 43, so as to reduce the amount of the mixed glue. Preferably, the height of the second protrusion 43 is 1-5 mm. If the height of the second protrusion 43 is too short, the glue injection space cannot be reduced, and if the height of the second protrusion 43 is too high, the overall structure installation of the LED display screen module is affected. More preferably, the height of the second protrusion 43 is 1.5-3.5 mm.
Specifically, the light-blocking substrate 41 is provided with a plurality of first through holes 412, second through holes 413 and third through holes 414, wherein the shape and size of the first through holes 412 are matched with the shape and size of the light guide column 54 of the optical lens 5 for limiting the light guide column 54; the shape and size of the second through hole 413 are matched with the shape and size of the lens mounting column 55 of the optical lens, and are used for limiting the lens mounting column 55; the shape and size of the third through hole 414 are matched with the shape and size of the positioning column 52 of the optical lens 5, so as to limit the positioning column 52.
When the optical lens is mounted on the light-shielding plate, the light guide column is inserted into the first through hole 412, the mounting column is inserted into the second through hole 413, and the positioning column is inserted into the third through hole 414.
The hardness of the material for making the light-insulating plate 4 is greater than that of PP, and preferably, the material for making the light-insulating plate 4 is PC containing 20% of glass fiber. The light-insulating plate 4 is less affected by temperature change, and the condition of failure of glue injection caused by expansion with heat and contraction with cold is effectively prevented.
S2, performing paint spraying treatment on the optical lens, and spraying the part except the light guide column on the back surface of the lens substrate into a preset color;
specifically, the paint spraying mold is covered on the optical lens, the light guide column is covered, and then the preset color material is sprayed on the back of the lens substrate. Wherein, the preset color material is black pigment or black paint and the like.
Referring to fig. 8 to 11, the paint spraying mold comprises a mold base plate 11 and a cover pillar 12, wherein the mold base plate 11 is provided with a connecting strip 111 and a vacancy 112, the connecting strip 111 and the vacancy 112 are alternately arranged in parallel, the cover pillar 12 is arranged on the connecting strip 111, the bottom of the cover pillar 12 is provided with an accommodating cavity 121 matched with a light guide pillar 21 of an optical lens 2, and the light guide pillar 21 is inserted into the accommodating cavity 121 and covered by the cover pillar 12.
Specifically, a plurality of cover pillars 12 are arranged on the connecting bar 111, and the positions of the cover pillars 12 correspond to the positions of the light guide pillars 21.
Specifically, the connecting bar 111 is used to connect the cover pillars 12, so as to ensure that the position of each cover pillar 12 corresponds to the position of the light guide pillar 21. The void 112 is designed to allow the predetermined color material to be uniformly sprayed on the back surface of the lens substrate, so that the larger the area of the void 112 is, the better the position of the cover pillar 12 can correspond to the position of the light guide pillar 21.
Preferably, the hollow portion 112 is a long strip having a length equal to that of the connecting bar 111.
Specifically, a plurality of light guide columns 21 are arranged on the optical lens 2, the light guide columns 21 are arranged in an array and are provided with n rows and m columns, n is more than or equal to 1, and m is more than or equal to 1; wherein, the distance b between two adjacent light guide columns 21 in the same column.
The connecting strip 111 is located above the same row of light guide posts 21, the hollow portion 112 is located between two adjacent rows of light guide posts 21, and when the paint is sprayed, the preset color material is covered on the place outside the light guide posts 21 on the back of the optical lens 2 through the hollow portion 112.
Preferably, the width of the hollow portion 112 is greater than or equal to the distance between two adjacent light guide posts 21 in the same row, and the length of the hollow portion 112 is greater than or equal to the total length of the light guide posts 21 in the same row.
Specifically, the width of the void 112 is k, and preferably k is (1.05 to 1.15) × b. More preferably, k is (1.08 to 1.12) b. When the width k of the hollow portion 112 is greater than the distance b between the light guide bars 21 in the same row, the predetermined color material can be more uniformly covered on the back of the optical lens 2 except the light guide bars 21.
Wherein the distance between the cover pillars 12 disposed on the connection bar 111 is equal to the distance between the light guiding pillars 21 of the same row.
Preferably, the two sides of the mold substrate 11 are further provided with mounting portions 113, the mounting portions 113 are provided with positioning holes 114, and when painting, the painting mold 1 is fixed above the optical lens 2 through the positioning holes 114, so that the mounting efficiency is effectively improved, and the cover column 12 on the painting mold 1 is ensured to cover the light guide column 21 on the optical lens 2.
In order to improve the efficiency, the mold substrate 11 is further provided with a direction mark 115, and during installation, an operator installs the direction mark 115 to fix the paint spraying mold 1 above the optical lens 2, so that the installation efficiency is effectively improved, and errors are reduced. Preferably, the direction indicator 115 is an arrow disposed on the mold substrate 11 by etching, printing, or opening a mold. The direction indicator 115 is disposed on the opposite surface of the mold substrate 11 to the cover pillar 12.
The cover column 12 comprises an extension part 122 and a mask part 123, the extension part 122 is arranged between the connecting strip 111 and the mask part 123, the accommodating cavity 121 is arranged in the mask part 123, and the cover column 12 ensures that each mask part 123 can completely cover the light guide column 21 through the extension part 122, thereby effectively preventing the optical lens 2 from being painted with color difference.
Preferably, the mask portion 123 is provided with at least two symmetrical inclined planes 124, the inclined planes 124 are inclined downwards from the connection position of the mask portion 123 and the extension portion 122, and the inclined planes 124 can enable the preset color material sprayed thereon to more uniformly cover the optical lens 2, so as to avoid excessive preset color material from accumulating on the mask portion 123.
Preferably, the included angle between the inclined plane 124 and the horizontal plane is 30-80 °. Preferably, the included angle between the inclined plane 124 and the horizontal plane is 45-60 degrees
Preferably, the horizontal cross-sectional width of the extension portion 122 is smaller than that of the mask portion 123 and equal to the width of the connecting bar 111. Thus, under the condition of ensuring the combining force of the extension part 122 and the connecting strip 111, the influence of the extension part 122 and the connecting strip 111 on paint spraying is reduced, and the preset color material can be uniformly covered on the optical lens 2.
Specifically, before painting, the positioning hole 114 is aligned according to the direction mark 115 on the mold substrate 11, the painting mold 1 is fixed above the optical lens 2 through the mounting portion 113 and the positioning hole 114, and the light guide post 21 is inserted into the accommodating cavity 121 of the mask portion 123, so that the mask portion 123 completely covers the light guide post 21.
S3, mounting the PCB on the bottom shell, and mounting the light-shielding plate on the PCB;
referring to fig. 12, the PCB 3 is placed on the first and second mounting posts 111 and 112, and screws are inserted into the mounting holes of the first mounting post 111 through the PCB 3, thereby fixing the PCB 3 to the first mounting post 111.
Because the first mounting column 111 is higher than the grid convex structure 113, a certain distance is reserved between the PCB board 3 and the grid convex structure 113, which can increase the air flow between the two and further improve the heat dissipation effect. Preferably, the grid projection structure 113 is in the shape of a honeycomb, but is not limited thereto.
Preferably, the predetermined distance between the PCB 3 and the grid bump structure 113 is determined by a height difference between the grid bump structure 113 and the first mounting post 111, and preferably, the height difference between the grid bump structure 113 and the first mounting post 111 is greater than the thickness of the PCB 3. Preferably, the thickness of the PCB 3 is less than the height difference between the grid protrusion 113 and the first mounting post 111 is less than 1.7 times the thickness of the PCB 3.
Still be equipped with first locating column 114 on the front of bottom plate 11, first locating column 114 is higher than first erection column 111, the top of first locating column 114 is inserted in the locating hole that PCB board 3 corresponds for confirm the relative position between PCB board 3 and the bottom plate 11, so that PCB board 3 installs on the drain pan fast, accurately.
The top of the first positioning column 114 is inserted into a corresponding positioning hole of the PCB 3 for determining the relative position between the PCB 3 and the bottom plate 11, so that the PCB 3 is quickly and accurately mounted on the bottom case.
Specifically, the light shielding plate 4 is erected on the bottom plate boss 21, and the bottom plate boss 21 is higher than the first mounting post 111, so that the light shielding plate 4 is arranged above the PCB 3.
S4, injecting the mixed glue into a glue injection groove of the light-isolating plate, and installing the optical lens on the light-isolating plate so that the optical lens, the bottom shell and the light-isolating plate form sealed connection;
specifically, the lens mounting post 55 is inserted through the second through hole 413 of the light insulation plate 4 and abutted against the PCB 3, a screw is inserted through the lens mounting post 55 and the PCB 3 and inserted into the mounting hole of the second mounting post 112, so that the light insulation plate 4 and the PCB 3 are clamped between the optical lens 5 and the bottom case to realize tight connection of the bottom case 1, the PCB 3, the light insulation plate 4 and the optical lens 5, the light guide post 54 is inserted through the first 412 of the light insulation plate 4 and arranged above the SMD light source 31, the lens positioning post 52 is inserted through the third through hole 414 of the light insulation plate 4, and the bottom of the lens positioning post is inserted into the PCB 3, wherein the light guide post 54 is in the same straight line with the SMD light source 31 on the PCB 3, and a preset distance is provided between the bottom of the light guide post 54 and the SMD light source 31. The mixed glue in the glue injection groove fills the gaps between the light-blocking plate 4 and the optical lens 5 and the bottom shell 1, so that the light-blocking plate 4 is hermetically connected with the bottom shell 1 and the optical lens 5.
When the optical lens 5 and the light shielding plate 4 of the present invention are mounted on the PCB 3, in order to achieve the consistency and the stability of the display effect of the display screen, the light guide pillar 54 and the SMD light source 31 on the PCB 3 are on the same vertical line, and a certain distance is kept between the bottom of the light guide pillar 54 and the SMD light source 31. In addition, in order to ensure that the light-shielding plate 4 can block the mutual influence between the light-guiding columns 54 and prevent light crosstalk, the light-guiding columns 54 need to penetrate through the light-shielding plate 4, and the lens substrate 51 needs to press the light-shielding plate 4 on the PCB 3, that is, the light-shielding plate 4 needs to be arranged between the lens substrate 51 and the PCB 3.
The light-shielding plate 4 is connected with the second mounting post 112 of the bottom case 1 through a screw, and the peripheries of the bottom case 1 and the light-shielding plate 4 (bottom case 1) need to be hermetically connected through glue, so that water vapor, dust and the like are prevented from entering the display. Because curb plate 12 is higher than the front of bottom plate 11, consequently drain pan 1 can prevent the colloid to overflow through curb plate 12 when the front injecting glue, reduces the injecting glue volume of colloid, reaches the effect that improves production efficiency, alleviates display screen weight.
Preferably, the side plate 12 is higher than the front surface of the bottom plate 11 by 0.5-1.5 mm. Specifically, the side plate 12 is higher than the front surface of the bottom plate 11 by 0.5mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5 mm.
Specifically, the inserting part 523 at the bottom of the lens positioning column 52 is inserted into the corresponding positioning through hole of the PCB board 3, wherein the protruding latch 522 on the lens positioning column 52 is clamped on the surface of the PCB board 3, so that the optical lens 5 can be prevented from rotating in the horizontal direction, the lens group is arranged right above the SMD light source 31, the matching precision of the whole LED display screen module is increased, and the LED display screen has good display effect consistency and stability.
It should be noted that the distance between the light guide bar 54 and the SMD light source 31 is mainly determined according to the brightness, the area and the light emitting angle of the SMD light source 31, and the present invention is not particularly limited.
When mixing glue and pouring into injecting glue groove 421 in, the mixing glue in injecting glue groove 421 slowly permeates the gap between first arch 42 and the 5 edges of optical lens to glue through mixing and carry out sealing connection with light baffle 4 and optical lens 5, improve the waterproof nature of LED display screen, if injecting glue groove 421's space is too big, then cause the injecting glue volume too much easily, increase the weight of whole LED display screen, also do not benefit to production efficiency's improvement.
Specifically, the mixed glue comprises glue A and glue B, wherein the glue A comprises hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide and black pigment, and the glue B comprises a coupling agent, a cross-linking agent, simethicone and a catalyst. Specifically, before use, glue A and glue B are uniformly mixed in proportion, wherein the mass ratio of the glue A to the glue B is (7-12): 1. preferably, the mass ratio of the glue A to the glue B is (9-11): 1. more preferably, the mass ratio of the glue A to the glue B is 10: 1. the black pigment is one or more of iron oxide black, ferroferric oxide and iron black.
The fluidity of the mixed glue plays an important role in the connection sealing performance of the light-shielding plate and the optical lens. If the fluidity of the mixed glue is too low, the mixed glue is difficult to be fully filled in the gap between the light-blocking plate and the optical lens, so that the sealing performance of the light-blocking plate and the optical lens cannot achieve the ideal effect; if the fluidity of the mixed glue is too high, the mixed glue is easy to flow out from the glue injection groove, and the light-emitting part of the optical lens is polluted. In particular, the flowability of the mixed glue according to the invention is determined by the viscosity of the mixed glue. Preferably, the viscosity of the mixed glue is 1800-2200 mPa.s. Preferably, the viscosity of the mixed glue is 1900-2000 mPa.s.
The viscosity of the mixed glue is finally determined by the viscosity of the glue A and the glue B, preferably, the viscosity of the glue A is 2500-3500 mPa.s, and the viscosity of the glue B is 5-10 mPa.s.
And S5, mounting the panel on the optical lens.
Specifically, the third mounting post 115 of the bottom case 1 is inserted through the PCB 3 and the light shielding plate 4 and abutted against the bottom of the panel 2, and a screw is inserted through the panel 2 and into the mounting hole of the third mounting post 115, so as to fix the panel 2 on the bottom case and cover the panel 2 on the optical lens 5.
Further, the second positioning column 116 passes through the PCB 3 and the light shielding plate 4, and the top of the second positioning column is inserted into a corresponding positioning hole of the panel 2 for determining the relative position between the panel 2 and the bottom plate 11, so that the panel 2 is quickly and accurately mounted on the bottom case
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (10)

1. A preparation method of an LED display screen is characterized by comprising the following steps:
s1, providing a bottom shell, a PCB, a light insulation plate, an optical lens and a panel;
s2, performing paint spraying treatment on the optical lens, and spraying the part except the light guide column on the back surface of the lens substrate into a preset color;
s3, mounting the PCB on the bottom shell, and mounting the light-shielding plate on the PCB;
s4, injecting the mixed glue into a glue injection groove of the light-isolating plate, and enabling a light guide column, a lens positioning column and a lens mounting column of the optical lens to penetrate through the light-isolating plate, wherein the bottom of the lens positioning column is inserted into a positioning hole of the PCB, and the bottom of the lens mounting column is abutted against the PCB so that the light guide column is arranged above an SMD light source on the PCB, and a light outlet part of the optical lens is arranged on the light-isolating plate;
the mixed glue in the glue injection groove permeates gaps among the light-isolating plate, the bottom shell and the optical lens so as to enable the light-isolating plate to be in sealing connection with the bottom shell and the optical lens;
and S5, mounting the panel on the optical lens.
2. The method according to claim 1, wherein the optical lens comprises a lens substrate, and the lens substrate is placed on the PCB, wherein the light emitting portion is disposed on a front surface of the lens substrate, and the lens positioning post, the lens mounting post, and the light guiding post are disposed on a rear surface of the lens substrate.
3. The method for manufacturing an LED display screen according to claim 2, wherein the bottom case comprises a bottom plate and a side plate surrounding the bottom plate, the front surface of the bottom plate is provided with a first mounting post, a second mounting post and a grid protruding structure, the first mounting post is higher than the grid protruding structure, the inner side wall of the side plate is provided with a bottom plate boss, and the bottom plate boss is higher than the first mounting post;
the PCB is placed on the first mounting column and the second mounting column, and the light isolation plate is erected on the boss of the bottom plate so as to be arranged above the PCB.
4. The method for manufacturing the LED display screen according to claim 3, wherein the light-shielding plate comprises a light-shielding substrate, a first protrusion and a second protrusion, the light-shielding substrate is provided with a plurality of mounting areas, the first protrusion protrudes upwards from the surface of the light-shielding substrate and surrounds the mounting areas, the glue injection groove is recessed downwards along the surface of the first protrusion, and the second protrusion is arranged inside the glue injection groove;
erecting a lens substrate on the first protrusion, and enabling the second protrusion to surround the lens substrate so as to enable mixed glue in the glue injection groove to penetrate into a gap between the light isolation plate and the optical lens and a gap between the light isolation plate and the bottom plate;
and the fixing piece penetrates through the lens mounting column and the PCB and is inserted into the mounting hole of the second mounting column for fastening so as to tightly connect the bottom shell, the PCB, the light isolation plate and the optical lens.
5. The method for preparing the LED display screen according to claim 1, wherein the degree of the mixed glue is 1800-2200 mPa.s.
6. The method for preparing the LED display screen according to claim 5, wherein the mixed glue comprises glue A and glue B, the glue A comprises hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide and black pigment, and the glue B comprises a coupling agent, a cross-linking agent, simethicone and a catalyst;
the mass ratio of the glue A to the glue B is (7-12): 1, the viscosity of the adhesive A is 2500-3500 mPa.s, and the viscosity of the adhesive B is 5-10 mPa.s.
7. The method for manufacturing an LED display screen according to claim 1, wherein the lens positioning post includes a post body, a protruding latch protruding outward along a sidewall of the post body, and an insertion portion located at a bottom of the post body;
inserting the inserting part into the corresponding positioning through hole of the PCB, and clamping the protruding latch on the surface of the PCB so as to enable the light guide column to have a preset distance with the SMD light source.
8. The method for manufacturing the LED display screen according to claim 7, wherein the back surface of the lens substrate is further provided with an annular protrusion and an annular groove, the annular protrusion protrudes outwards along the back surface of the lens substrate and surrounds the periphery of the light guide column, and the annular protrusion abuts against the light-shielding plate;
the annular groove is recessed inwards along the back surface of the lens substrate and is arranged between the light guide column and the annular protrusion.
9. The method of claim 1, wherein in step S2, the painting mold is covered on the optical lens, the light guiding pole is covered, and then the material with preset color is painted on the back of the lens substrate; the preset color material is black pigment or black paint.
10. The method for manufacturing an LED display screen according to claim 9, wherein the paint-spraying mold comprises a mold base plate and a cover pillar, the mold base plate is provided with a connecting strip and a vacant part, the connecting strip and the vacant part are alternately arranged in parallel, the cover pillar is arranged on the connecting strip, the bottom of the cover pillar is provided with a receiving cavity matched with the light guide pillar of the optical lens, and the light guide pillar is inserted into the receiving cavity and covered by the cover pillar.
CN202011357941.2A 2020-11-27 2020-11-27 Preparation method of LED display screen Active CN112599029B (en)

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