CN112466220A - LED display screen - Google Patents
LED display screen Download PDFInfo
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- CN112466220A CN112466220A CN202011357945.0A CN202011357945A CN112466220A CN 112466220 A CN112466220 A CN 112466220A CN 202011357945 A CN202011357945 A CN 202011357945A CN 112466220 A CN112466220 A CN 112466220A
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- 230000003287 optical effect Effects 0.000 claims abstract description 70
- 239000000758 substrate Substances 0.000 claims abstract description 45
- 230000017525 heat dissipation Effects 0.000 claims abstract description 38
- 239000003292 glue Substances 0.000 claims description 59
- 238000002347 injection Methods 0.000 claims description 36
- 239000007924 injection Substances 0.000 claims description 36
- 238000002955 isolation Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 19
- 238000007789 sealing Methods 0.000 abstract description 7
- FPWNLURCHDRMHC-UHFFFAOYSA-N 4-chlorobiphenyl Chemical compound C1=CC(Cl)=CC=C1C1=CC=CC=C1 FPWNLURCHDRMHC-UHFFFAOYSA-N 0.000 description 36
- 239000000084 colloidal system Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 101150006573 PAN1 gene Proteins 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- 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
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0213—Venting apertures; Constructional details thereof
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- 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
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
-
- 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
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/064—Hermetically-sealed casings sealed by potting, e.g. waterproof resin poured in a rigid casing
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses an LED display screen, which comprises a bottom shell, a panel, a PBC plate, a light-isolating plate and an optical lens, wherein the bottom shell comprises a bottom plate and a side plate surrounding the periphery of the bottom plate; the optical lens comprises a lens substrate, a lens group and a lens positioning column, wherein the lens group comprises a light emergent part and a light guide column, the light emergent part is arranged on the front surface of the lens substrate, and the positioning column and the light guide column are arranged on the back surface of the lens substrate. The LED display screen has the advantages of high matching precision, good sealing performance, good heat dissipation effect, and good consistency and stability of the display effect.
Description
Technical Field
The invention relates to the technical field of LED display screens, in particular to 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 bottom shell, the PCB, the light isolating plate and the lens are tightly connected to reduce the overall thickness of the LED display screen, and the overall heat dissipation effect of the LED display screen is improved.
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 invention aims to solve the technical problem of providing an LED display screen which is high in matching precision, good in sealing performance, good in heat dissipation effect and good in consistency and stability of the display effect.
The technical problem to be solved by the present invention is to provide an LED display screen, which can solve the problem that the light utilization rate of the existing SMD outdoor display screen in the vertical (up-down) direction is not high, but the viewing angle in the horizontal (left-right) direction is smaller after using the common convex lens.
In order to solve the technical problems, the invention provides an LED display screen which comprises a bottom shell, a panel, a PBC plate, a light-shielding plate and an optical lens, wherein the bottom shell comprises a bottom plate and a side plate surrounding the periphery of the bottom plate, a first mounting column, a second mounting column and a grid protruding structure are arranged on the front surface of the bottom plate, the first mounting column is higher than the grid protruding structure, and a bottom plate boss is arranged on the inner side wall of the side plate; the optical lens comprises a lens substrate, a lens group and a lens positioning column, wherein the lens group comprises a light emergent part and a light guide column, the light emergent part is arranged on the front surface of the lens substrate, and the positioning column and the light guide column are arranged on the back surface of the lens substrate;
the PCB is arranged on the first mounting column, so that a preset distance is reserved between the grid protruding structure and the PCB, and the light isolation plate is arranged on the bottom plate boss, so that the light isolation plate is arranged above the PCB;
the second mounting column fixes the optical lens on the light insulation plate, the light insulation plate and the PCB are clamped between the optical lens and the bottom shell, the bottom of the lens positioning column is inserted into the PCB, and the light guide column and the SMD light source on the PCB are on the same straight line.
As an improvement of the above scheme, the first mounting column is higher than the grid raised structure, and the bottom plate boss is higher than the first mounting column;
the optical lens is provided with a lens mounting column corresponding to the second mounting column, the lens mounting column penetrates through the light-isolating plate and abuts against the PCB, 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 so as to tightly connect the bottom shell, the PCB, the light-isolating plate and the optical lens.
As an improvement of the above scheme, the front surface of the bottom plate is further provided with a first positioning column, a third mounting column and a second positioning column, the first positioning column is higher than the first mounting column, and the top of the first positioning column is inserted into a corresponding positioning hole of the PCB so as to determine the relative position between the PCB and the bottom plate;
the third mounting column is higher than the first positioning column, penetrates through the PCB, the light isolation plate and the optical lens and abuts against the bottom of the panel to fix the panel above the optical lens;
the second positioning column is higher than the third mounting column, penetrates through the PCB, the light isolation plate and the optical lens, and the top of the second positioning column is inserted into the corresponding positioning hole of the panel so as to determine the relative position between the panel and the bottom plate.
As an improvement of the above scheme, a heat dissipation area, a heat dissipation through hole, a fourth mounting column and a fifth mounting column are arranged on the back surface of the bottom plate, and the fourth mounting column is arranged in the heat dissipation area and used for mounting the mainboard;
the fifth mounting column is arranged on the periphery of the heat dissipation area and used for mounting a radiator;
the heat dissipation through hole is located in the heat dissipation area and penetrates through the bottom plate, and cold air generated by a radiator arranged in the heat dissipation area enters the bottom shell through the heat dissipation through hole.
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;
the light guide column is inserted into the light isolation through hole corresponding to the light isolation plate, the inserting part is inserted into the positioning through hole corresponding to the PCB, and the protruding latch is clamped on the surface of the PCB so that the light guide column and the SMD light source have a preset distance.
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, the light emitting portion has an incident plane and a light emitting plane, the incident plane is perpendicular to a horizontal plane, the light emitting plane and the horizontal plane intersect to form a first curve, the first curve has a total reflection section and a refraction section adjacent to the total reflection section, at least part of light incident from the incident plane is totally reflected in the total reflection section and is emitted through the adjacent refraction section after being totally reflected;
the light emitting surface and the vertical surface are intersected to form a second curve, the vertical surface is perpendicular to the incident plane and the horizontal plane respectively, and the second curve protrudes towards the direction far away from the incident plane.
As an improvement of the above scheme, the light-blocking plate includes a light-blocking substrate, a first protrusion and a second protrusion, the light-blocking substrate is provided with a plurality of mounting regions, the first protrusion protrudes upward from the surface of the light-blocking substrate and surrounds the mounting regions, the optical lens is erected on the first protrusion, the first protrusion is provided with a glue injection groove, the glue injection groove is recessed downward along the surface of the first protrusion, a glue is injected into the glue injection groove to hermetically connect the light-blocking plate and the optical lens, and the second protrusion is disposed inside the glue injection groove.
As an improvement of the scheme, the second protrusion is higher than the glue injection groove, the depth of the glue injection groove is 0.3-0.8 mm, and the height of the second protrusion is 1-5 mm.
As a modification of the above, the first projection is provided between two adjacent mounting regions to partition all the mounting regions;
the inner side of the first protrusion, which is close to the mounting area, is provided with a light-blocking plate boss, and the light-blocking plate boss is used for receiving glue which leaks downwards from a gap between the first protrusion and the edge of the optical lens.
The implementation of the invention has the following beneficial effects:
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 the tight connection of the bottom shell, the PCB, the light-isolating plate and the optical lens; and finally, the colloid is injected into the edge of the light-isolating plate, so that the optical lens, the light-isolating plate and the bottom shell form sealed connection, wherein the colloid can be prevented from overflowing through the side plates, the glue injection amount of the colloid is reduced, the production efficiency is improved, and the weight of the display screen is reduced.
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.
The bottom plate still is equipped with the heat dissipation through-hole, the heat dissipation through-hole runs through the bottom plate, just the heat dissipation through-hole is located the radiating area, and cold wind that the radiator produced can get into the drain pan through the heat dissipation through-hole in, the exchange of the inside and outside air of heating drain pan further improves the radiating effect.
The light-emitting surface of the light-emitting part is intersected with the horizontal plane to form a first curve which is provided with a total reflection section and a refraction section, so that at least part of light rays entering from the incident plane in the horizontal direction can be totally reflected in the total reflection section, the totally reflected light rays have larger emergent angles in the process, then the light rays are emitted through the adjacent refraction sections, and the emergent angles are increased again when the light rays are emitted from the refraction sections, so that the visual angle in the horizontal (left and right) direction is increased.
The light-emitting surface of the light-emitting part is intersected with the vertical surface to form a second curve which protrudes towards the direction far away from the incident plane, so that light rays entering from the incident plane in the vertical direction can be converged towards the middle, the visual angle in the vertical (up-down) direction is reduced, and the problem of low utilization rate of the light rays in the vertical direction is solved.
The light-shielding plate disclosed by the invention has the advantages that the first bulge is arranged on the light-shielding plate substrate to surround the mounting area, and the glue injection groove for injecting glue is arranged on the first bulge so as to hermetically connect the light-shielding plate and the optical lens. In addition, the second bulges are arranged in the glue injection groove to reduce the space of the glue injection groove and the glue injection amount of the glue, so that the effects of improving the production efficiency and reducing the weight of the display screen are achieved.
The light-isolating plate boss is arranged on the inner side of the first bulge close to the mounting area and used for receiving the colloid which leaks downwards from the gap between the first bulge and the edge of the optical lens, so that the colloid is prevented from dripping on the PCB.
Drawings
FIG. 1 is an exploded view of an LED display screen of the present invention;
FIG. 2 is a perspective view of the bottom housing of the LED display screen of the present invention;
FIG. 3 is a cross-sectional view of the bottom housing of the LED display screen of the present invention;
FIG. 4 is a first perspective view of an optical lens of an LED display screen according to the present invention;
FIG. 5 is a partial cross-sectional view of an LED display screen of the present invention;
FIG. 6 is a front view of an optical lens of the LED display screen of the present invention;
FIG. 7 is a second perspective view of an optical lens of an LED display screen according to the present invention;
FIG. 8 is a front view of a lens assembly of an optical lens for an LED display screen according to the present invention;
FIG. 9 is a left side view of FIG. 8;
FIG. 10 is a front view of the light exiting portion of the lens assembly of the optical lens of the LED display screen of the present invention;
FIG. 11 is a perspective view of an LED display screen light barrier panel of the present invention;
FIG. 12 is an enlarged view at A in FIG. 11;
fig. 13 is a front view of the light-shielding plate of the LED display panel 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.
Referring to fig. 1, the present invention provides an LED display screen, which includes a bottom case 1, a panel 2, a PBC board 3, a light-blocking 4 and an optical lens 5.
Referring to fig. 2 and 3, 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.
Referring to fig. 4, 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. 5, the PCB 3 is disposed on the first mounting post 111 such that the grid projection structure 113 has a predetermined distance from the PCB 3; the side plate 12 is higher than the front surface of the bottom plate 11, a bottom plate boss 21 is arranged on the inner side wall of the side plate 12, and the light-shielding plate 4 is erected on the bottom plate boss 21, wherein the bottom plate boss 21 is higher than the first mounting column 111 so as to arrange the light-shielding plate 4 above the PCB 3; the second mounting column 112 is used for fixing the optical lens 5 arranged on the light-shielding plate 4, the fixing member penetrates through the optical lens 5 and the PCB 3 and is inserted into the mounting hole of the second mounting column 112, the light-shielding plate 4 and the PCB 3 are clamped between the optical lens 5 and the bottom shell, so as to realize tight connection of the bottom shell 1, the PCB 3, the light-shielding plate 4 and the optical lens 5, the bottom of the lens positioning column 52 is inserted into the PCB 3, wherein the light guiding column 54 is on the same straight line with the SMD light source 31 on the PCB 3, and a preset distance is reserved between the bottom of the light guiding column 54 and the SMD light source 31.
Specifically, the first mounting post 111 protrudes upward along the front surface of the bottom plate 11, and a mounting hole is formed in the first mounting post, so that during mounting, a screw penetrates through the PCB 3 and is inserted into the mounting hole of the first mounting post 111, thereby fixing the PCB 3 on the first mounting post 111.
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. In addition, a certain distance is reserved between the PCB 3 and the grid convex structure 113, so that air flow between the PCB and the grid convex structure can be increased, and the heat dissipation effect is further improved. Preferably, the grid projection structure 113 is in the shape of a honeycomb, but is not limited thereto.
The preset distance between the PCB 3 and the grid convex structure 113 is determined by the height difference between the grid convex structure 113 and the first mounting column 111, and preferably, the height difference between the grid convex structure 113 and the first mounting column 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.
The PCB 3 is disposed on the first mounting post 111 on the front surface of the bottom plate 11, and besides being fixed on the bottom case 1 by screws, the PCB 3 needs to be hermetically connected with the peripheries of the bottom case 1 and the PCB 3 (by a sealant). 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 optical lens 5 is provided with a lens mounting post 55 corresponding to the second mounting post 112, the lens mounting post 55 penetrates through the light-shielding plate 4 and abuts against the PCB 3, and a screw penetrates through the lens mounting post 55 and the PCB 3 and is inserted into a mounting hole of the second mounting post 112, so that the light-shielding plate 4 and the PCB 3 are clamped between the optical lens 5 and the bottom shell, the PCB 3, the light-shielding plate 4 and the optical lens 5 are tightly connected.
Preferably, the diameter of the second mounting post 112 is larger than the diameter of the first mounting post 111, and since the length of the screws for screwing the optical lens 5 and the second mounting post 112 is longer than the length of the screws for screwing the PCB 3 and the first mounting post 111, the mounting hole in the second mounting post 112 is larger than the mounting hole in the first mounting post 111, and thus the diameter of the second mounting post 112 is larger than the diameter of the first mounting post 111.
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.
A third mounting column 115 and a second positioning column 116 are further disposed on the front surface of the bottom plate 11, the third mounting column 115 is higher than the first mounting column 111, the third mounting column 115 is used for mounting the panel 2, specifically, the third mounting column 115 passes through the PCB 3 and the light-blocking plate 4 and abuts against the bottom of the panel 2, and a screw passes through the panel 2 and is inserted into a mounting hole of the third mounting column 115, so as to fix the panel 2 on the bottom case and cover the panel 2 on the optical lens 5. The second positioning column 116 is higher than the third mounting column 115, the second positioning column 116 passes through the PCB 3 and the light shielding plate 4, and the top of the second positioning column 116 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.
Referring to fig. 6, a heat dissipation area 121, a fourth mounting post 122 and a fifth mounting post 123 are disposed on the back surface of the bottom plate 11, and the fourth mounting post 122 is disposed in the heat dissipation area 121 and is used for mounting a motherboard; the fifth mounting post 123 is disposed around the heat dissipation area 121 for mounting a heat sink.
The back of the bottom plate 11 is further provided with a third positioning column 124, the third positioning column 124 is arranged in the heat dissipation area 121, and the third positioning column 124 is used for determining the relative position between the motherboard and the bottom plate 11, so that the motherboard is quickly and accurately mounted on the heat dissipation area 121.
The bottom plate 11 is further provided with a heat dissipation through hole 125, the heat dissipation through hole 125 penetrates through the bottom plate 11, the heat dissipation through hole 125 is located in the heat dissipation area 121, cold air generated by the heat radiator can enter the bottom shell through the heat dissipation through hole 125, and the exchange of the air inside and outside the bottom shell is heated, so that the heat dissipation effect is further improved.
Preferably, the heat dissipating through-hole 125 is a long bar shape, but is not limited thereto. The through-hole 125 of the present invention may also be circular, square, polygonal, or the like.
It should be noted that, 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 against the PCB 3, that is, the light-shielding plate 4 needs to be disposed between the lens substrate 51 and the PCB 3.
Referring to fig. 7, 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.
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.
Therefore, the lens positioning column 52 is arranged on the back of the lens substrate 51, when the lens positioning column 52 is installed, the lens positioning column 52 penetrates through the light-shielding plate 4, and the insertion part 523 at the bottom of the lens positioning column 52 is inserted into the corresponding positioning through hole of the PCB 3, wherein the convex latch 522 on the lens positioning column 52 is clamped on the surface of the PCB 3, and the light guide column 54 is inserted into the corresponding light-shielding through hole of the light-shielding plate 4, so that the light guide column 54 is ensured to be arranged right above the SMD 31 and keeps a certain distance.
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.
Preferably, the back surface of the lens substrate 51 is at least provided with 3 lens positioning columns 52 arranged in a triangular shape, the PCB 3 is provided with positioning through holes corresponding to the lens positioning columns 52, and the insertion parts 523 of the lens positioning columns 52 are inserted into the positioning through holes corresponding to the PCB 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 consistency and stability of display effect.
Specifically, the lens mounting post 55 is disposed on the back of the lens substrate 51, the lens mounting post 55 is provided with a through hole, the through hole penetrates through the lens mounting post 55 and the lens substrate 51, and during installation, the lens mounting post 55 penetrates through the light shielding plate 4 and abuts against the PCB 3.
The back surface of the lens substrate 51 is further provided with an annular protrusion 56, the annular protrusion 56 protrudes outwards along the back surface of the lens substrate 51 and surrounds the periphery of the light guide column 54, and the annular protrusion 56 abuts against the light-shielding plate 4. The annular protrusion 56 can further prevent the light guide posts 54 from interfering with each other and cross-talk while protecting the light guide posts 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. 8 to 10, the light emitting portion 53 has an incident plane 531 and a light emitting plane, the incident plane 531 is perpendicular to the horizontal plane, the light emitting plane intersects with the horizontal plane to form a first curve 532, the first curve 532 has a total reflection section and a refraction section adjacent to the total reflection section, at least a part of the light incident from the incident plane 531 is totally reflected in the total reflection section, and the light is emitted through the adjacent refraction section after being totally reflected; the light emitting surface and the vertical surface intersect to form a second curve 533, the vertical surface is perpendicular to the incident plane 531 and the horizontal plane, and the second curve 533 protrudes in a direction away from the incident plane 531.
In the present invention, the intersection of the light-emitting surface of the light-emitting portion 53 and the horizontal plane forms a first curve 532 having a total reflection section and a refraction section, so that at least a part of the light entering from the incident plane 531 in the horizontal direction can be totally reflected in the total reflection section, in this process, the totally reflected light has a larger exit angle, and then the light exits through the adjacent refraction section, and when exiting through the refraction section, the exit angle is increased again, so that the viewing angle in the horizontal (left and right) direction is increased.
In the invention, the light-emitting surface of the light-emitting part 53 intersects with the vertical surface to form the second curve 533 which protrudes towards the direction far away from the incident plane 531, so that the light rays entering from the incident plane 531 in the vertical direction can be converged towards the middle, the visual angle in the vertical (up-down) direction is reduced, and the problem of low utilization rate of the light rays in the vertical direction is avoided.
The cross-sectional area of the end of the light guide pillar 54 close to the incident plane 531 is larger than the cross-sectional area of the end of the light guide pillar 54 far from the incident plane 531, so that the light of the SMD light source 31 can completely enter the light outlet portion 53 after being guided by the light guide pillar 54, and the utilization rate of the light is ensured.
Preferably, a light path portion 534 is further disposed between the light guide pillar 54 and the incident plane 531, and the light path portion 534 is disposed on the front surface of the lens substrate 51, the optical lens 5 can be conveniently mounted by disposing the light path portion 534, that is, the whole optical lens 5 can be positioned and fixed by using the light path portion 534.
Referring to fig. 11 to 13, 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 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; when the colloid injected into injecting glue groove 421, the colloid in injecting glue groove 421 slowly permeated the gap between first arch 42 and the 5 edges of optical lens to carry out sealing connection with light baffle 4 and optical lens 5 through the colloid, improved the waterproof nature of LED display screen, if the space of injecting glue groove 421 is too big, then caused the injecting glue volume easily too much, increased the weight of whole LED display screen, also do not favorable to production efficiency's improvement. In the invention, the second bulge 43 is further arranged in the glue injection groove 421 to reduce the glue injection space and the glue injection amount of the 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 glue in the glue injection groove 421 can penetrate into the gap between the first protrusion 42 and the edge of the optical lens 5.
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 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 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 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 glue leaking downwards from the gap between the first protrusion 42 and the edge of the optical lens 5, so as to prevent the glue from leaking onto the PCB. Wherein, the height of the light-shielding plate boss 44 is less than that of the first protrusion 42.
The second protrusion 43 is higher than the glue injection groove 421 to prevent the glue in the glue injection groove 421 from flooding the second protrusion 43. Specifically, the glue injected into the glue injection groove 421 slowly infiltrates 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 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.
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. An LED display screen is characterized by comprising a bottom shell, a panel, a PBC plate, a light-isolating plate and an optical lens, wherein the bottom shell comprises a bottom plate and a side plate surrounding the periphery of the bottom plate, a first mounting column, a second mounting column and a grid protruding structure are arranged on the front surface of the bottom plate, the first mounting column is higher than the grid protruding structure, and a bottom plate boss is arranged on the inner side wall of the side plate; the optical lens comprises a lens substrate, a lens group and a lens positioning column, wherein the lens group comprises a light emergent part and a light guide column, the light emergent part is arranged on the front surface of the lens substrate, and the positioning column and the light guide column are arranged on the back surface of the lens substrate;
the PCB is arranged on the first mounting column, so that a preset distance is reserved between the grid protruding structure and the PCB, and the light isolation plate is arranged on the bottom plate boss, so that the light isolation plate is arranged above the PCB;
the second mounting column fixes the optical lens on the light insulation plate, the light insulation plate and the PCB are clamped between the optical lens and the bottom shell, the bottom of the lens positioning column is inserted into the PCB, and the light guide column and the SMD light source on the PCB are on the same straight line.
2. The LED display screen of claim 1, wherein the first mounting post is higher than the grid-raised structure and the base plate boss is higher than the first mounting post;
the optical lens is provided with a lens mounting column corresponding to the second mounting column, the lens mounting column penetrates through the light-isolating plate and abuts against the PCB, 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 so as to tightly connect the bottom shell, the PCB, the light-isolating plate and the optical lens.
3. The LED display screen of claim 1, wherein the front surface of the bottom plate is further provided with a first positioning column, a third mounting column and a second positioning column, the first positioning column is higher than the first mounting column, and the top of the first positioning column is inserted into a corresponding positioning hole of the PCB so as to determine the relative position between the PCB and the bottom plate;
the third mounting column is higher than the first positioning column, penetrates through the PCB, the light isolation plate and the optical lens and abuts against the bottom of the panel to fix the panel above the optical lens;
the second positioning column is higher than the third mounting column, penetrates through the PCB, the light isolation plate and the optical lens, and the top of the second positioning column is inserted into the corresponding positioning hole of the panel so as to determine the relative position between the panel and the bottom plate.
4. The LED display screen of claim 3, wherein the back surface of the bottom plate is provided with a heat dissipation area, a heat dissipation through hole, a fourth mounting column and a fifth mounting column, and the fourth mounting column is arranged in the heat dissipation area and used for mounting a mainboard;
the fifth mounting column is arranged on the periphery of the heat dissipation area and used for mounting a radiator;
the heat dissipation through hole is located in the heat dissipation area and penetrates through the bottom plate, and cold air generated by a radiator arranged in the heat dissipation area enters the bottom shell through the heat dissipation through hole.
5. The LED display screen of claim 1, wherein the lens positioning post comprises a post, a protruding latch and a mating portion, the protruding latch protruding outward along a sidewall of the post, the mating portion located at a bottom of the post;
the light guide column is inserted into the light isolation through hole corresponding to the light isolation plate, the inserting part is inserted into the positioning through hole corresponding to the PCB, and the protruding latch is clamped on the surface of the PCB so that the light guide column and the SMD light source have a preset distance.
6. The LED display screen of claim 5, 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.
7. The LED display screen of claim 1, wherein the light exiting portion has an incident plane and a light exiting plane, the incident plane is perpendicular to the horizontal plane, the light exiting plane intersects the horizontal plane to form a first curve, the first curve has a total reflection segment and a refraction segment adjacent to the total reflection segment, at least a portion of the light entering from the incident plane is totally reflected at the total reflection segment, and the light exits through the adjacent refraction segment after being totally reflected;
the light emitting surface and the vertical surface are intersected to form a second curve, the vertical surface is perpendicular to the incident plane and the horizontal plane respectively, and the second curve protrudes towards the direction far away from the incident plane.
8. The LED display screen of claim 1, 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 optical lens is erected on the first protrusion, the first protrusion is provided with a glue injection groove, the glue injection groove is downwards sunken along the surface of the first protrusion, glue is injected into the glue injection groove to hermetically connect the light-shielding plate and the optical lens, and the second protrusion is arranged inside the glue injection groove.
9. The LED display screen of claim 8, wherein the second protrusion is higher than the glue injection groove, the depth of the glue injection groove is 0.3-0.8 mm, and the height of the second protrusion is 1-5 mm.
10. The LED display screen of claim 9, wherein the first protrusion is disposed between two adjacent mounting areas to separate all of the mounting areas;
the inner side of the first protrusion, which is close to the mounting area, is provided with a light-blocking plate boss, and the light-blocking plate boss is used for receiving glue which leaks downwards from a gap between the first protrusion and the edge of the optical lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011357945.0A CN112466220A (en) | 2020-11-27 | 2020-11-27 | LED display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011357945.0A CN112466220A (en) | 2020-11-27 | 2020-11-27 | LED display screen |
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| CN112466220A true CN112466220A (en) | 2021-03-09 |
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| CN202011357945.0A Pending CN112466220A (en) | 2020-11-27 | 2020-11-27 | LED display screen |
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