CN115440140A - High-contrast LED display screen - Google Patents
High-contrast LED display screen Download PDFInfo
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- CN115440140A CN115440140A CN202110625732.XA CN202110625732A CN115440140A CN 115440140 A CN115440140 A CN 115440140A CN 202110625732 A CN202110625732 A CN 202110625732A CN 115440140 A CN115440140 A CN 115440140A
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- 230000000903 blocking effect Effects 0.000 claims abstract description 32
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims description 29
- 238000009434 installation Methods 0.000 abstract description 4
- 230000004888 barrier function Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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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Abstract
The invention discloses a high-contrast LED display screen which comprises a bottom shell, a light source plate, a light isolation plate and a lens module, wherein the bottom shell is provided with a sunken installation cavity; the lens module comprises a plurality of lenses and a lens substrate for forming connection of the lenses, wherein the lenses comprise light emergent parts and light guide rods connected to the bottoms of the light emergent parts; the light-blocking plate comprises a light-blocking substrate and a light-blocking cover, the light-blocking cover surrounds the periphery of the light-guiding rod and is used for blocking light emitted by other light-guiding rods, wherein the light-blocking cover is provided with a vacant part, and the vacant part is emitted from the vacant part through the light-guiding rod so as to reduce the total reflection times of the light-guiding rod. The light barrier plate provided by the invention can not only block the influence between the lenses, but also reduce the multiple reflection of light in the light guide rod, and improve the contrast of the LED display screen.
Description
Technical Field
The invention relates to the technical field of LED display screens, in particular to a high-contrast 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 contrast ratio of the LED display screen refers to the ratio of the maximum brightness of the LED display screen to the background brightness under a certain ambient illumination. The influence of the contrast on human eyes is deeply recognized, so that the light reflection coefficient of the surface of the screen is reduced as much as possible while the brightness of the screen is improved, and the higher the contrast can be ensured under the condition that the highest luminous intensity of the screen is not changed as the light reflection coefficient of the surface material of the screen is controlled to be lower.
The existing LED display screen generally improves the contrast ratio of the LED display screen by modifying a face mask and increasing the brim of the face mask, but the brim of the face mask can easily generate risks such as accumulated snow and the like, so that the reliability of the LED display screen is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-contrast LED display screen, wherein the structure of a light-shielding plate is changed to enable the light-shielding plate to be matched with a lens module, so that a new direction and thought are innovatively developed, and the contrast of the LED display screen is effectively improved.
The invention also aims to solve the technical problem of providing the LED display screen with high contrast, and the LED display screen has good sealing performance and high reliability.
In order to solve the technical problem, the invention provides a high-contrast LED display screen which comprises a bottom shell, a light source plate, a light isolation plate and a lens module, wherein the bottom shell is provided with a sunken installation cavity;
the lens module comprises a plurality of lenses and a lens substrate for connecting the lenses, wherein the lenses comprise light emergent parts and light guide rods connected to the bottoms of the light emergent parts;
the light-blocking plate comprises a light-blocking substrate and a light-blocking cover, the light-blocking cover surrounds the periphery of the light-guiding rod and is used for blocking light emitted by other light-guiding rods, wherein the light-blocking cover is provided with a vacant part, and the vacant part is emitted from the vacant part through the light-guiding rod so as to reduce the total reflection times of the light-guiding rod.
As an improvement of the above scheme, the light-blocking substrate is provided with a plurality of light-blocking through holes, the light-blocking cover is arranged below each light-blocking through hole and connected to the back of the light-blocking substrate, the light-blocking cover comprises a front baffle, a rear baffle, a left baffle, a right baffle and an upper coaming, the upper coaming is provided with an upper coaming through hole, the front baffle and the rear baffle are connected to the bottom of the upper coaming, the front baffle, the rear baffle, the left baffle and the right baffle are connected to form a light guide rod accommodating cavity, the light guide rod accommodating cavity is communicated with the upper coaming through hole, the hollow part is arranged between the left baffle and the upper coaming and is a left hollow part, the hollow part is arranged between the right baffle and the upper coaming and is a right hollow part, the left baffle is arranged on the left side of the light guide rod, and the right baffle is arranged on the right side of the light guide rod.
As an improvement of the scheme, the height of the left baffle is H 1 The exit angle of the light from the left side of the light guide rod is lambda 1 Corresponding to the output angle lambda 1 The distance between the intersection point of the ray with the maximum numerical value and the left side surface of the light guide rod and the bottom of the light guide rod is L 1 Wherein, 0.7 × L 1 ＜H 1 ≤L 1 ；
The height of the right baffle is H 2 The exit angle of the light from the right side of the light guide rod is lambda 2 Corresponding to the ejection angle lambda 2 The distance between the intersection point of the ray with the maximum numerical value and the right side surface of the light guide rod and the bottom of the light guide rod is L 2 Wherein, 0.7 × L 2 ＜H 2 ≤L 2 。
As an improvement of the above, λ 1 ＜λ 2 ，H 2 ＜H 1 。
As an improvement of the above scheme, the cross-sectional area of the end of the light guide rod close to the light emergent portion is larger than the cross-sectional area of the end of the light guide rod far away from the light emergent portion, the height of the light guide rod is 3-20 mm, and the inclination is 0.1-10 °.
As an improvement of the scheme, the height of the left baffle is 1-17 mm, and the height of the right baffle is 1-12 mm.
In an improvement of the above scheme, the height of the light guide rod is 5-15 mm, the slope is 1-8 degrees, the height of the left baffle is preferably 4-13 mm, and the height of the right baffle 324 is 2-7 mm.
As an improvement of the scheme, the light shield further comprises a connecting plate, the connecting plate is connected to the bottom of the upper enclosing plate and connected with the front baffle and the rear baffle, and the connecting plate is arranged above the left hollow part or above the right hollow part.
As an improvement of the above scheme, the light source plate comprises a light source substrate and an LED light source arranged on the light source substrate, and the light guide rod is arranged right above the LED light source;
the light shield further comprises a protruding portion, and the protruding portion is connected to the bottoms of the front baffle and the rear baffle and abuts against the light source substrate.
As an improvement of the above scheme, the light-shielding substrate is provided with a plurality of glue-pouring areas, glue-blocking protrusions are arranged around the glue-pouring areas, annular seats are arranged around the lens substrate in a downward protruding manner and abut against the glue-blocking protrusions, the light-guiding rod is inserted into the light-shielding cover, and glue is filled between the lens substrate and the light-shielding substrate;
and a glue blocking strip is arranged between the glue pouring areas and is arranged on the glue blocking protrusion, and the top of the glue blocking strip is 2-8 mm lower than the top of the light emergent part.
The implementation of the invention has the following beneficial effects:
according to the LED display screen, the structure of the light-insulating plate is changed, the hollow part is arranged on the light-insulating plate, part of light passing through the light guide rod is emitted from the light-emitting part, part of light is emitted from the hollow part of the light-insulating cover, so that the total reflection times of the light guide rod are reduced, the light emitted from the hollow part is blocked by the light-insulating cover which is adjacently surrounded on the periphery of the light guide rod, so that light interference between the light guide rods is avoided, and therefore, no influence is caused between lenses, and the contrast of the LED display screen is effectively improved.
The light shield comprises a front baffle, a rear baffle, a left baffle, a right baffle and an upper coaming, wherein the height of the left baffle is H 1 The exit angle of the light from the left side of the light guide rod is lambda 1 Corresponding to the output angle lambda 1 The distance between the intersection point of the ray with the maximum numerical value and the left side surface of the light guide rod and the bottom of the light guide rod is L 1 The height of the right baffle is H 2 The exit angle of the light from the right side of the light guide rod is lambda 2 Corresponding to the ejection angle lambda 2 The distance between the intersection point of the ray with the maximum numerical value and the right side surface of the light guide rod and the bottom of the light guide rod is L 2 When 0.7 x L 1 ＜H 1 ≤L 1 ，0.7*L 2 ＜H 2 ≤L 2 When the light source is used, the number of times of reflection of the light in the light guide rod is the minimum, the light emitted from the light emitting part is the maximum, and the contrast of the LED display screen is the highest.
According to the invention, the glue pouring area, the glue blocking bulge and the glue blocking strip are arranged on the light-blocking substrate, so that glue is effectively prevented from overflowing, the sealing property between the light-blocking cover and the lens is enhanced, and the sealing property and the reliability of the LED display screen are improved.
Drawings
FIG. 1 is an exploded view of a high contrast LED display screen of the present invention;
FIG. 2 is a schematic diagram of light emission from a conventional LED display screen light shield sleeved on a light guide rod;
FIG. 3 is a perspective view of the light barrier panel of the present invention;
FIG. 4 is a front view of the light shield of the present invention;
FIG. 5 is a perspective view of the light-blocking cover of the present invention;
FIG. 6 is a first schematic view of light extraction from the light-blocking mask of the present invention;
FIG. 7 is a second schematic view of light extraction from the light-blocking mask of the present invention;
FIG. 8 is a perspective view of a light transmission module of the present invention;
FIG. 9 is a first cross-sectional view of a high contrast LED display screen of the present invention;
FIG. 10 is a second cross-sectional view of the high contrast LED display 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. It is to be understood that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", and the like as used herein, whether or not specifically defined herein, are used in a generic and descriptive sense only and not for purposes of limitation.
Referring to fig. 1, the present invention provides a high contrast LED display screen, including a bottom case 1, a light source plate 2, a light blocking plate 3 and a lens module 4, wherein the bottom case 1 is provided with a recessed mounting cavity 11, the light source plate 2, the light blocking plate 3 and the lens module 4 are mounted in the mounting cavity 11, light emitted from the light source plate 2 is emitted through the lens module 4, the lens module 4 includes a plurality of lenses and a lens substrate 41 connecting the plurality of lenses, the lenses include a light emitting portion 42 and a light guiding rod 43 connected to the bottom of the light emitting portion 42, the light blocking plate 3 includes a light blocking substrate 31 and a light blocking cover 32, the light blocking cover 32 surrounds the light guiding rod 43 and is used for blocking light emitted from other light guiding rods 43, wherein the light blocking cover 32 is provided with a blank portion, light emitted from the light emitting portion 42 through the light guiding rod 43 is emitted from the blank portion of the light guiding rod 32, so as to reduce the number of total reflection of the light guiding rods 43, and light emitted from the blank portion is blocked by the light guiding rod 43 surrounded between adjacent light blocking covers 32.
Specifically, the light source board 2 includes a light source substrate 21 and an LED light source 22 disposed on the light source substrate 21, the light guide bar 43 is disposed right above the LED light source 22, and the bottom of the light shielding cover 32 abuts against the light source substrate 21. In order to improve the light-emitting uniformity of the LED display screen, the LED light sources 22 are arranged in a plurality of arrays, the number and positions of the lenses correspond to the number and positions of the LED light sources 22 one by one, and similarly, the number of the light-shielding covers 32 also corresponds to the number of the light-guiding rods 43 one by one. The light emitted from the LED light source 22 passes through the light guide rod 43 and then is emitted from the light emitting portion 42, the light is totally reflected in the light guide rod 43, if the light-blocking cover 32 wrapped around the light guide rod 43 has no empty portion for emitting the light, the light will be trapped in the light guide rod 43 by the light-blocking cover 32 which is completely sealed, and the light will be emitted from the light emitting portion 42 again after multiple reflections, as shown in fig. 2, thus the contrast of the LED display screen will be reduced after multiple reflections.
Specifically, referring to fig. 3, the light-blocking substrate 31 is provided with a plurality of light-blocking through holes 311, and the light-blocking cover 32 is disposed below each light-blocking through hole 311 and connected to the back surface of the light-blocking substrate 31.
Referring to fig. 4 to 6, the light shielding cover 32 includes a front baffle 321, a rear baffle 322, a left baffle 323, a right baffle 324 and an upper enclosing plate 325, the upper enclosing plate 325 is provided with an upper enclosing plate through hole 3251, the front baffle 321 and the rear baffle 322 are connected to the bottom of the upper enclosing plate 325, the front baffle 321, the rear baffle 322, the left baffle 323 and the right baffle 324 are connected to enclose to form a light guide rod 43 accommodating cavity 326, the light guide rod 43 accommodating cavity 326 is communicated with the upper enclosing plate through hole 3251, the hollow portion is provided between the left baffle 323 and the upper enclosing plate 325 and is a left hollow portion 3231, the hollow portion is provided between the right baffle 324 and the upper enclosing plate 325 and is a right hollow portion 3241, the left baffle 323 is provided on the left side of the light guide rod 43, the right baffle 324 is provided on the right side of the light guide rod 43, the front baffle 321 is provided in front of the light guide rod 43, and the rear baffle 322 is provided behind the light guide rod 43.
Specifically, referring to fig. 6, the light guide rod 43 inserted into the accommodating cavity 326 of the light guide rod 43 of the present application, light is not trapped in the light guide rod 43, wherein part of the light is emitted from the light emitting portion 42, part of the light is emitted from the left vacant portion 3231 and the right vacant portion 3241 of the light shielding cover 32, and the light emitted from the left vacant portion 3231 or the right vacant portion 3241 is blocked by the left baffle 323 or the right baffle 324 of the light shielding cover 32 of the adjacent lens, so that there is no influence between the lenses, thereby improving the contrast of the LED display screen.
It should be noted that the heights of the left baffle 323 and the right baffle 324 play an important role in the light blocking effect of the light blocking cover 32, and if the heights of the left baffle 323 and the right baffle 324 are too short, the light influence of other lenses cannot be effectively blocked; if the height of left baffle 323 and right baffle 324 is too high, light will be trapped within light bar 43.
With reference to figure 7 of the drawings,the height of the left baffle 323 is H 1 The exit angle of the light emitted from the left side surface of light guide rod 43 is λ 1 Corresponding to the output angle lambda 1 The distance between the intersection point of the ray with the largest numerical value and the left side surface of light guide rod 43 and the bottom of light guide rod 43 is L 1 Wherein, 0.7 × L 1 ＜H 1 ≤L 1 . The right baffle 324 has a height H 2 The exit angle of the light ray from the right side surface of the light guide rod 43 is λ 2 Corresponding to the output angle lambda 2 The distance between the intersection point of the ray with the largest numerical value and the right side surface of light guide rod 43 and the bottom of light guide rod 43 is L 2 Wherein, 0.7 × L 2 ＜H 2 ≤L 2 . Preferably, H 1 ＝L 1 ，H 2 ＝L 2 . Due to lambda 1 ＜λ 2 Then H is 2 ＜H 1 。
Preferably, light guide rod 43 has a height of 3 to 20mm and a slope of 0.1 to 10 °, where the slope is the slope of the left and right slopes of light guide rod 43. If the height of the light guide rod 43 is less than 3mm, the corresponding heights of the left baffle 323 and the right baffle 324 are too small to play a role in blocking; if the height of light guide rod 43 is greater than 20mm, for light guide rod 43 with small inclination, the heights of left baffle 323 and right baffle 324 need to be increased to slightly change the refraction angle of light, which is not beneficial to production and manufacturing; for a light guiding rod 43 with a large slope, the longer the length, the more likely it will interfere with the adjacent lens.
More preferably, the height of the light guide bar 43 is 5 to 15mm, the slope is 1 to 8 °, specifically, the height of the light guide bar 43 is 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, and the slope is 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, 8 °.
For the light guide rod 43 with the height of 3-20 mm and the inclination of 0.1-10 degrees, the height of the left baffle 323 is 1-17 mm, the height of the right baffle 324 is 1-12 mm, if the heights of the left baffle 323 and the right baffle 324 are smaller than the range, light rays from the periphery cannot be well blocked, and meanwhile, production is not facilitated; if the light quantity is larger than the above range, the light in the light guide rod 43 is directly blocked, and the light returns to the light guide rod 43 again.
For the light guide rod 43 with a height of 5-15 mm and a slope of 1-8 °, the height of the left baffle 323 is preferably 4-13 mm, the height of the right baffle 324 is 2-7 mm, specifically, the height of the left baffle 323 is preferably 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, and the height of the right baffle 324 is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm.
Specifically, the upper portion of light guide rod 43 is generally provided with a slope 431 inclined downward, and the slope 431 is provided on the right side of light guide rod 43, so that the light in light guide rod 43 is totally reflected by the slope 431, and the slope can make more light be emitted from the light emitting portion. If the light needs to be emitted from the right side surface of light guide rod 43, total reflection needs to be performed at least once.
In order to enhance the overall strength of the light shielding cover 32, the light shielding cover 32 further comprises a connecting plate 327, the connecting plate 327 is connected to the bottom of the upper enclosing plate 325 and is connected to the front enclosing plate 321 and the rear enclosing plate 322, and the connecting plate 327 is disposed above the left vacant portion 3231 or above the right vacant portion 3241 for enhancing the overall strength of the light shielding cover 3. The shorter the height of the web 327 is theoretically more favorable for increased contrast, but the balance between the two is needed for strength of the overall structure. Preferably, the height of the connecting plate 327 is 1 to 5mm.
The bottoms of the front baffle 321, the rear baffle 322, the left baffle 323 and the right baffle 324 are on the same plane as the bottom of the light guide rod 43, so as to block the light of the light guide rod 43, but the light guide rod 43 is disposed on the LED light source 22, and in order to prevent the light that does not enter the light guide rod 43 from interfering with another LED light source 2431, the light shielding cover 32 further includes a protrusion 328, the protrusion 328 is connected to the bottoms of the front baffle 321 and the rear baffle 322, and the protrusion 328 abuts against the light source substrate during installation, so as to prevent the light guide rod 43 from colliding with the LED light source 22.
Preferably, the protruding portion 328 is provided with an anti-sticking through hole 3281, and since the light source substrate is coated with three-proofing paint, if the light source substrate is melted at high temperature, the light source substrate and the light shielding cover 32 are adhered together, so that the contact area can be reduced by increasing the anti-sticking through hole.
Referring to fig. 3, the light-blocking substrate 31 of the present invention is not only used for connecting the light-blocking cover 32, but also has the functions of supporting the lens module 4, blocking glue and preventing water. Specifically, the light-blocking substrate 31 is provided with a plurality of glue-pouring areas 312, and glue-blocking protrusions 313 are arranged around the glue-pouring areas 312. Specifically, referring to fig. 8 and 9, an annular seat 411 is convexly provided around the lens substrate 41, the annular seat 411 abuts on the glue blocking protrusion 313, the light guide rod 43 is inserted into the light shielding cover 32, and the glue blocking protrusion 313 is used for blocking glue from overflowing during glue filling, so that the glue is fully filled between the light shielding substrate 31 and the lens substrate 41, and the sealing performance between the light shielding plate 3 and the lens module 4 is enhanced.
Further, a glue blocking strip 314 is further arranged between the glue filling areas 312, and the glue blocking strip 314 is arranged on the glue blocking protrusion 313 and used for isolating the light emergent portion 42 and reducing the glue consumption. Preferably, the top of the adhesive tape 314 is lower than the top of the light-emitting portion 42, so as to avoid the influence of the adhesive tape 314 on the light-emitting of the light-emitting portion 42. Preferably, the top of the rubber stopper 314 is 2 to 8mm lower than the top of the light exit part 42.
According to the invention, the glue filling area 312, the glue blocking protrusion 313 and the glue blocking strip 314 are arranged on the light-insulating substrate 31, so that glue is effectively prevented from overflowing, and the sealing property between the light-insulating plate 3 and the lens module 4 is enhanced.
The cross-sectional area of the end of the light guide rod 43 close to the light outlet part 42 is larger than the cross-sectional area of the end of the light guide rod 43 far away from the light outlet part 42, so that most of the light of the LED light source 22 enters the light outlet part 42 after being guided by the light guide rod 43, and the utilization rate of the light can be effectively ensured.
Preferably, the upper portion of light guide rod 43 is generally provided with a slope 431 inclined downward, and the slope 431 is provided at the right side of light guide rod 43, so that the light in light guide rod 43 is totally reflected by the slope 431, and the slope can make more light be emitted from light emitting portion 42. If the light needs to be emitted from the right side surface of light guide rod 43, total reflection needs to be performed at least once.
In order to ensure the overall strength of the lens module 4 of the present invention, the lens substrate 41, the light emergent portion 42 and the light guide rod 43 are integrally formed; in order to ensure the light emitting effect of the lens module 4, the material of the lens module 4 is transparent PC.
Referring to fig. 9, a mounting table 12 is convexly disposed at the bottom of the mounting cavity 11, the light source substrate 21 is provided with a first mounting through hole, the mounting table 12 is mounted in the first mounting through hole in a matching manner, and the upper surface of the mounted light source substrate 21 is flush with the surface of the mounting table 12.
Referring to fig. 10, a first mounting seat 13 is further convexly disposed at the bottom of the mounting cavity 11, the light source substrate 21 is provided with a plurality of second mounting through holes, a second mounting seat 412 is convexly disposed on the lower surface of the lens substrate 41, a plurality of first connecting through holes are disposed on the surface of the light-blocking substrate 31, and the first mounting seat 13 penetrates through the second mounting through holes to be connected with the second mounting seat 412 penetrating through the first connecting through holes.
The invention will be further illustrated by the following specific examples
Example 1
A high-contrast LED display screen comprises a bottom shell, a light source plate, a light isolation plate and a lens module, wherein the bottom shell is provided with a sunken installation cavity; the lens module comprises a plurality of lenses and a lens substrate for forming connection of the lenses, wherein the lenses comprise light emergent parts and light guide rods connected to the bottoms of the light emergent parts;
the light-proof plate comprises a light-proof base plate and a light-proof cover, the light-proof cover comprises a front baffle, a rear baffle, a left baffle, a right baffle and an upper coaming, the front of the light-guiding rod is arranged on the front baffle, the rear of the light-guiding rod is arranged on the rear baffle, the left side of the light-guiding rod is arranged on the left side of the left baffle, the right side of the light-guiding rod is arranged on the right baffle, the height of the light-guiding rod is 11mm, the inclination of the light-guiding rod is 2 degrees, the height of the front baffle and the height of the rear baffle are 11mm, the height of the left baffle is 7mm, and the height of the right baffle is 4mm.
Example 2
Unlike embodiment 1, the height of the left baffle is 6mm, and the height of the right baffle is 3mm.
Example 3
Unlike embodiment 1, the height of the left baffle is 8mm, and the height of the right baffle is 4mm.
Comparative example 1
Unlike embodiment 1, the height of the left baffle is 11mm, and the height of the right baffle is 11mm.
Comparative example 2
Unlike embodiment 1, the height of the left baffle is 3mm, and the height of the right baffle is 1mm.
The LED panels of examples 1 to 3 and of comparative examples 1 to 2 were tested for contrast according to European standard EN12966:2014, with the following results:
it should be noted that the above detection method mainly uses searchlights with different illumination intensities to illuminate the LED display screen at different angles, so as to test the surface brightness of the LED display screen to obtain the contrast, where the higher the surface brightness, the lower the contrast. The third column of the table is to illuminate the LED display with a 40000lx searchlight at an angle of 10 ° to the LED display.
According to the structure, the LED display screen is arranged in the light shield, and partial light is emitted from the vacant part of the light shield, so that the total reflection times of the light guide rod are reduced, the surface brightness of the LED display screen can be effectively reduced, and the contrast of the LED display screen is improved.
The light-shielding cover in the comparative example 1 is completely sealed, and light can be trapped in the light-guiding rod for multiple reflections, so that the contrast of the LED display screen is obviously lower than that of the LED display screen disclosed by the invention.
In addition, in the light shielding cover in the comparative example 2, the left baffle and the right baffle are too short to effectively block the light of the adjacent light guide rods, and the light channeling phenomenon occurs, so that the contrast of the LED display screen is obviously lower than that of the LED display screen disclosed by the invention.
Further, the heights of the left baffle and the right baffle of the embodiments 2 and 3 are lower than or higher than the heights of the left baffle and the right baffle of the embodiment 1, and the contrast of the LED display screens of the embodiments is lower than that of the LED display screen of the embodiment 1, so that the heights of the left baffle and the right baffle have an important influence on the contrast of the LED display screen for the light guide rods with the same size.
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 high-contrast LED display screen is characterized by comprising a bottom shell, a light source plate, a light isolation plate and a lens module, wherein the bottom shell is provided with a sunken mounting cavity;
the lens module comprises a plurality of lenses and a lens substrate for forming connection of the lenses, wherein the lenses comprise light emergent parts and light guide rods connected to the bottoms of the light emergent parts;
the light-blocking plate comprises a light-blocking substrate and a light-blocking cover, the light-blocking cover surrounds the periphery of the light-guiding rod and is used for blocking light emitted by other light-guiding rods, wherein the light-blocking cover is provided with a vacant part, and the vacant part is emitted from the vacant part through the light-guiding rod so as to reduce the total reflection times of the light-guiding rod.
2. The high-contrast LED display screen according to claim 1, wherein the light-shielding substrate is provided with a plurality of light-shielding through holes, the light-shielding cover is disposed below each light-shielding through hole and connected to the back surface of the light-shielding substrate, the light-shielding cover comprises a front baffle, a rear baffle, a left baffle, a right baffle and an upper panel, the upper panel is provided with an upper panel through hole, the front baffle and the rear baffle are connected to the bottom of the upper panel, the front baffle, the rear baffle, the left baffle and the right baffle are connected and enclosed to form a light-guiding rod accommodating cavity, the light-guiding rod accommodating cavity is communicated with the upper panel through hole, the hollow portion is disposed between the left baffle and the upper panel, the hollow portion is a left hollow portion, the hollow portion is disposed between the right baffle and the upper panel, the right baffle is disposed on the left side of the light-guiding rod, and the right baffle is disposed on the right side of the light-guiding rod.
3. The high contrast LED display screen of claim 2, wherein said left baffle has a height H 1 The exit angle of the light emitted from the left side of the light guide rod is lambda 1 Corresponding to the ejection angle lambda 1 The distance between the intersection point of the ray with the maximum numerical value and the left side surface of the light guide rod and the bottom of the light guide rod is L 1 Wherein, 0.7 × L 1 ＜H 1 ≤L 1 ；
The height of the right baffle is H 2 The exit angle of the light from the right side of the light guide rod is lambda 2 Corresponding to the ejection angle lambda 2 The distance between the intersection point of the ray with the maximum numerical value and the right side surface of the light guide rod and the bottom of the light guide rod is L 2 Wherein, 0.7 × L 2 ＜H 2 ≤L 2 。
4. The high contrast LED display screen of claim 3 in which λ 1 ＜λ 2 ，H 2 ＜H 1 。
5. The high contrast LED display panel according to claim 4, wherein the cross-sectional area of the end of the light guide rod close to the light outlet portion is larger than the cross-sectional area of the end of the light guide rod far from the light outlet portion, the height of the light guide rod is 3 to 20mm, and the slope is 0.1 to 10 °.
6. The high contrast LED display screen of claim 5, wherein the height of the left baffle is 1-17 mm and the height of the right baffle is 1-12 mm.
7. The high contrast LED display screen of claim 6, wherein the height of the light guiding bar is 5-15 mm, the slope is 1-8 °, the height of the left baffle is preferably 4-13 mm, and the height of the right baffle 324 is 2-7 mm.
8. The high-contrast LED display screen as claimed in claim 2, wherein the light-shielding cover further comprises a connecting plate connected to the bottom of the upper panel and connected to the front and rear panels, and the connecting plate is disposed above the left or right hollow portion.
9. The high-contrast LED display screen of claim 1, wherein the light source board comprises a light source substrate and LED light sources disposed on the light source substrate, the light guide bar being disposed directly above the LED light sources;
the light shield further comprises a protruding portion, and the protruding portion is connected to the bottoms of the front baffle and the rear baffle and abuts against the light source substrate.
10. The high-contrast LED display screen as claimed in claim 1, wherein the light-shielding substrate has a plurality of glue-pouring areas, the periphery of the glue-pouring areas is provided with glue-blocking protrusions, the periphery of the lens substrate is provided with annular seats protruding downwards, the annular seats abut against the glue-blocking protrusions, the light-guiding rod is inserted into the light-shielding cover, and glue is filled between the lens substrate and the light-shielding substrate;
and a glue blocking strip is arranged between the glue pouring areas and is arranged on the glue blocking protrusion, and the top of the glue blocking strip is 2-8 mm lower than the top of the light outlet part.
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| CN202110625732.XA CN115440140B (en) | 2021-06-04 | 2021-06-04 | High-contrast LED display screen |
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| CN202110625732.XA CN115440140B (en) | 2021-06-04 | 2021-06-04 | High-contrast LED display screen |
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