CN113066398A - LED display unit and LED screen - Google Patents

Abstract

The utility model provides a LED display element and LED screen relates to audio transmission technical field. Wherein, the LED display unit includes: a circuit board; the light-emitting elements are arranged on the circuit board, and a plurality of first through holes are formed in the circuit board in the areas where the light-emitting elements are not arranged; the first surface of the bottom plate is attached to the surface, not provided with the light-emitting elements, of the circuit board, a plurality of second through holes are formed in the bottom plate, the second through holes are one by one opposite to the first through holes, the second through holes are communicated with the first through holes, the first opening area of the second through holes in the first surface of the bottom plate is larger than the second opening area in the second surface of the bottom plate, and the cross-sectional area of the first through holes is larger than or equal to the first opening area. Through the technical scheme of the disclosure, the aperture of the sound wave input end is smaller than that of the output end, and the structure of the transmission channel is beneficial to reducing high-frequency attenuation in the sound wave.

Description

LED display unit and LED screen

Technical Field

The present disclosure relates to the field of audio transmission technology, and in particular, to an LED display unit and an LED screen.

Background

The traditional cinema uses the mode of front projection to project the film picture on the curtain with the sound transmission function, and the sound transmission is carried out by combining the film sound reproduction sound box placed behind the curtain, and the sound passes through the curtain to restore the film sound, so that the sound and picture synchronization is realized.

In the related art, as LED (Light Emitting Diode) display technology with direct display function is more and more mature, cinema also starts to adopt LED display unit as a carrier for playing movie, where the LED display unit includes lamp beads and a Circuit Board (Printed Circuit Board), because the lamp beads are uniformly arranged in an array manner, and the Circuit Board has many chips and Circuit wiring, if the LED display unit realizes sound transmission function, holes need to be opened, and if the holes are not opened properly, serious sound attenuation and sound distortion may be caused.

It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

An object of the present disclosure is to provide an LED display unit and an LED screen that can improve, at least to some extent, a problem of poor hearing effect of a user caused when panoramic sound is played in a movie hall in the related art.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

According to an aspect of the present disclosure, there is provided an LED display unit including: a circuit board; the light-emitting elements are arranged on the circuit board, and a plurality of first through holes are formed in the circuit board in the areas where the light-emitting elements are not arranged; the first surface of the bottom plate is attached to the surface, not provided with the light-emitting elements, of the circuit board, a plurality of second through holes are formed in the bottom plate, the second through holes are one by one opposite to the first through holes, the second through holes are communicated with the first through holes, the first opening area of the second through holes in the first surface of the bottom plate is larger than the second opening area in the second surface of the bottom plate, and the cross-sectional area of the first through holes is larger than or equal to the first opening area.

In one embodiment, the cross-sectional area of the second through-hole gradually increases in a direction from the second surface toward the first surface; or the cross-sectional area of the second through hole is gradually reduced and then gradually increased from the second surface to the first surface.

In one embodiment, the ratio between the second aperture and the first aperture is greater than or equal to 0.46 and less than or equal to 0.52; and/or under the condition that the cross-sectional area of the second through hole is gradually increased from the second surface to the first surface, the taper angle of the second through hole is greater than or equal to 18 degrees and less than or equal to 22 degrees.

In one embodiment, the plurality of light emitting elements are arranged on the circuit board in an array; the first through hole comprises a first elongated hole, and a plurality of first elongated holes are formed between two adjacent rows of the light-emitting elements at intervals; the second through hole comprises a second elongated hole adapted to the first elongated hole, wherein the first elongated hole and the second elongated hole comprise at least one of an elongated round hole, and a rectangle.

In one embodiment, the spacing between two adjacent rows of the light emitting elements is greater than or equal to 5 mm.

In one embodiment, between two adjacent rows of the light emitting elements, the ratio between the spacing between two adjacent first elongated holes and the length of the first elongated hole is greater than or equal to 0.9 and less than or equal to 1.1.

In one embodiment, the second surface of the bottom plate is provided with a plurality of rows of reinforcing ribs in parallel; the second through hole is formed between two adjacent reinforcing ribs.

In one embodiment, the stiffener is configured as a V-shaped stiffener; and a gradually narrowed groove is formed by two adjacent V-shaped reinforcing ribs, and the bottom of the groove is provided with the second through hole.

In one embodiment, the first via has an opening ratio of greater than or equal to 12% and less than or equal to 20% on the circuit board.

According to a second aspect of the present disclosure, there is provided an LED screen comprising: the box body support is internally provided with a plurality of installation cavities in a separating way; the LED display unit according to any one of the above technical solutions is assembled in the mounting cavity.

The LED display unit and the LED screen provided by the embodiment of the disclosure realize the display function by arranging the plurality of light-emitting elements on the circuit board, the first through hole is formed in the area where the light-emitting elements are not arranged on the circuit board, the second through hole communicated with the first through hole is formed on the bottom plate, the first through hole and the second through hole which are communicated form a transmission channel of sound waves, the aperture of the sound wave input end is smaller than that of the output end by arranging the second through hole as the variable cross-section through hole with smaller aperture at one end and larger aperture at the other end, and the structure of the transmission channel is favorable for reducing the high-frequency attenuation in the sound waves.

In addition, the structural style that sets up circuit board and bottom plate laminating is combined, reduces the clearance between first through-hole and the second through-hole, reduces the extra cavity that produces among the transmission path to the harmonic distortion that produces among the sound transmission process that can be better restraines sound wave interference effect and helmholtz resonance effect, reduction.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 shows a schematic structural diagram of an LED display unit in an embodiment of the present disclosure;

FIG. 2 shows a schematic view of a portion of the structure at A in FIG. 1;

FIG. 3 is a partial block diagram of a bottom plate of an LED display unit according to an embodiment of the present disclosure;

FIG. 4 is a schematic partial cross-sectional structural view of section B-B of FIG. 2;

fig. 5 is a schematic partial structural diagram illustrating an LED display unit according to an embodiment of the present disclosure, in which a first backplane structure is adopted;

fig. 6 is a schematic partial structural diagram illustrating a second backplane structure employed in an LED display unit according to an embodiment of the present disclosure;

FIG. 7 is a graph showing the comparison of the sound transmission effect of the sound transmission scheme of the present disclosure and the sound transmission scheme of the related art in the embodiment of the present disclosure;

FIG. 8 shows a block diagram of an LED screen in an embodiment of the disclosure.

Wherein the reference numerals in fig. 1 to 8 are explained as follows:

10 circuit board, 102 first through hole, 20 light emitting element, 30 bottom plate, 302 second through hole, 302A first opening, 302B second opening, 304 reinforcing rib and 40 box body support.

Detailed Description

Exemplary embodiments that embody features and advantages of the present disclosure are described in detail below in the specification. It is to be understood that the disclosure is capable of various modifications in various embodiments without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

In the following description of various exemplary embodiments of the disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration various exemplary structures in which aspects of the disclosure may be practiced. Other specific arrangements of systems and steps, and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although the terms "over", "between", "within", and the like may be used in this specification to describe various example features and elements of the disclosure, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples in the drawings. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures in order to fall within the scope of this disclosure.

As an application scene of the LED display unit and the LED screen, in a cinema, according to cinema engineering, a loudspeaker system is placed behind the LED screen, namely when a movie is played, restored sound waves are transmitted from a bottom plate in the LED display unit to the direction of a circuit board, through holes are correspondingly formed in the bottom plate and the circuit board to form a transmission channel, and the sound waves are transmitted to an auditorium in front from the rear of the LED screen through the transmission channel. During the transmission of sound waves, the following problems are easily generated: on one hand, the transmission of sound waves in the transmission channel is easy to generate larger sound radiation loss; on the other hand, the sound wave is transmitted in the transmission channel, so that the Helmholtz resonance effect is easily generated, and the transmission of the sound wave is influenced; on the other hand, because the length of the transmission channel is the sum of the thicknesses of the circuit board and the base plate, when the thicknesses of the circuit board and the base plate are larger, a guide tube of sound waves is formed, standing wave tube effect is easily formed in a high-frequency section, phase inconsistency is caused, mutual offset between phases is possibly caused, and particularly the high-frequency characteristic of the sound waves is influenced. The sound-transmitting LED screen with the existing open pore structure cannot meet the technical requirement of a film sound-transmitting screen, namely the sound effect of a cinema cannot be met.

Fig. 1 illustrates that one embodiment of the present disclosure provides an LED display unit.

Fig. 2 shows a partial structural schematic at a in fig. 1.

As shown in fig. 2, one embodiment of the present disclosure provides an LED display unit including: a circuit board 10; the number of the plurality of light emitting elements 20,.

Further, as shown in fig. 3, the present disclosure also includes a bottom plate 30 attached to the circuit board 10.

In this embodiment, for the circuit board 10, the light emitting elements may be specifically light emitting diodes, the plurality of light emitting elements 20 are disposed on one surface of the circuit board 10, a first through hole 102 is disposed in a region of the circuit board 10 where no light emitting element 20 is disposed, and a plurality of first through holes 102 are disposed in a region of the circuit board 10 where no light emitting element 20 is disposed.

The first through hole 102 may be a hole with a constant cross section or a cross-sectional hole.

In addition, as can be understood by those skilled in the art, in the existing technology level, due to the limitation of the processing technology, the first through hole is preferentially processed into a straight hole, that is, the first through hole is a straight hole with a constant cross section, and as the technology level of the circuit board gradually develops, the first through hole may also be processed into a direction from the side where the light emitting element is not disposed to the side where the light emitting element is disposed, and the cross sectional area of the first through hole gradually increases.

In this embodiment, two opposite surfaces of the base plate 30 are respectively referred to as a first surface and a second surface of the base plate 30, and the first surface of the base plate 30 is attached to a surface of the circuit board 10 on which the light emitting elements 20 are not disposed.

The specific implementation manner of the bottom plate 30 and the other surface of the light emitting element 20 being attached to each other includes: the contact area of the bottom plate 30 with the circuit board 10 is a plane, and is attached and fastened with the circuit board 10 in a screw manner.

In this embodiment, the bottom plate 30 is provided with a plurality of second through holes 302 which are opposite to the first through holes 102 one by one, and the opposite second through holes 302 are communicated with the first through holes 102 and used as sound transmission channels of sound waves.

As shown in fig. 4, the opening area of the first opening 302A of the second through hole 302 on the first surface of the base plate 30 is larger than the opening area of the second opening 302B on the second surface of the base plate 30.

The LED display unit in the present disclosure will be described specifically below with the side on which the light emitting elements are disposed being referred to as a front side, the second surface of the base plate being referred to as a back side, and sound waves being transmitted from the back side to the front side.

Specifically, by defining the opening area of the first opening 302A to be larger than the opening area of the second opening 302B, i.e., the entrance area of the sound-transparent channel for sound waves is smaller than the exit area of the sound-transparent channel, the loss of sound energy during sound propagation is reduced.

In order to ensure the adhesion between the base plate and the circuit board, the first surface is a plane, and the second surface can be a plane or a curved surface.

In addition, the bottom plate can be attached to the circuit board as an independent plate-shaped structure, and can also be attached to the circuit board as a bottom plate which is a component of the bottom shell structure.

The material of the base plate is preferably plastic.

Specifically, in the application scene of cinema, the front of LED display element is the one side towards the auditorium, and the back of LED display element is the one side relative with speaker system, and the sound wave that speaker system sent passes through the propagation of sound-transparent channel, transmits for audience from the back of LED display element, because reduced the acoustic energy loss, correspondingly, is favorable to promoting audience to the receiving effect of sound.

In the present embodiment, the cross-sectional area of the first through-hole 102 is greater than or equal to the area of the first opening 302A.

Preferably, the cross-sectional area of the first through-hole 102 is equal to the area of the first opening 302A to ensure smooth splicing of the first through-hole and the second through-hole.

Specifically, the second through hole 302 is communicated with the first through hole 102 and the aperture of the first through hole 102 is greater than or equal to the second aperture, that is, the sidewalls of the first through hole 102 and the second through hole 302 at the butt joint position can be smoothly transited, or at the butt joint position, the first through hole 102 extends outwards relative to the second through hole 302 and is butt jointed together, so that it can be ensured that the aperture of the sound wave input end is smaller than the aperture of the output end.

In this embodiment, the LED display unit includes a circuit board 10 and a bottom plate 30 attached to each other, a display function is realized by disposing a plurality of light emitting elements 20 on the circuit board 10, a first through hole 102 is opened in an area where no light emitting element 20 is disposed on the circuit board 10, and a second through hole 302 communicated with the first through hole 102 is opened on the bottom plate 30, the first through hole 102 and the second through hole 302 communicated with each other form a sound transmission channel of sound waves, the aperture of the sound wave input end is smaller than the aperture of the output end by disposing the second through hole 302 as a variable cross-section through hole having a smaller aperture at one end and a larger aperture at the other end, and the structure of the sound transmission channel is favorable for reducing high frequency attenuation in the sound waves.

Further, the structural style that sets up circuit board 10 and bottom plate 30 laminating is combined, is favorable to reducing the clearance between first through-hole 102 and the second through-hole 302, and then reduces the extra cavity that produces in the sound-transparent channel to the harmonic distortion that produces among the sound transmission process that can be better restraines sound wave interference effect and helmholtz resonance effect, reduction.

Still further, the thickness of the bottom plate 30 and the PCB lamp can be reduced without affecting the structural strength, which can reduce the volume of the sound wave sound transmission channel and reduce the high frequency attenuation generated when the sound wave passes through.

As a specific construction mode of the LED display unit, the light-emitting element 20 is welded on the circuit board 10, the circuit board 10 and the bottom board 30 are installed on the box body bracket as the LED display unit, the bottom board 30 and the circuit board 10 are hollowed out with a gap with a certain area to form a sound transmission groove, and the two parts of the sound transmission groove are communicated with each other to form a sound transmission channel. The thickness of the bottom plate 30 and the circuit board 10 is reduced without affecting the strength, so that the volume of the sound wave sound transmission channel can be reduced, and the high-frequency attenuation generated when the sound wave passes through is reduced.

As shown in fig. 3, on the premise that the opening area of the first opening 302A on the first surface of the bottom plate 30, which defines the second through hole 302, is larger than the opening area of the second opening 302B on the second surface of the bottom plate 30, in one embodiment, the cross-sectional area of the second through hole gradually increases from the second surface to the first surface.

Specifically, the cross-sectional area of the second through-hole gradually increases from the second surface toward the first surface, and as a preferred embodiment, in the lateral sectional view shown in fig. 4, two generatrices shown in the lateral section of the second through-hole are straight lines.

In addition, it can be understood by those skilled in the art that the two bus bars shown in the lateral section of the second through-hole may also be curved under the case that ensures that the cross section of the second through-hole gradually increases along the sound wave transmission direction.

In this embodiment, as a specific implementation manner that the first aperture of the second through hole 302 at the end far from the circuit board 10 is smaller than the second aperture at the end attached to the circuit board 10, the second through hole 302 is set to be a hole gradually expanded from the transmission direction of the sound wave, and is more favorable for preventing the sound wave from being attenuated too fast in the middle and high frequency band compared with a through hole structure with a constant cross-sectional area.

In addition, as can be understood by those skilled in the art, the inner walls of the first through hole and the second through hole are smooth inner walls, and the smooth inner walls can ensure smooth transmission of sound waves along the sound transmission channel, so that the influence of abrupt structural changes on tone quality, sound radiation loss and medium-high frequency attenuation can be prevented.

In another embodiment, on the premise of ensuring that the opening area of the first opening 302A is larger than the opening area of the second opening 302B, the second through hole may also be set as follows: the cross-sectional area of the second through-hole gradually decreases and then gradually increases from the second surface toward the first surface, i.e., the direction of sound wave transmission.

Specifically, by setting the two generatrices shown in the lateral cross section of the second through hole as curves, the second through hole is configured such that the cross sectional area is gradually decreased and then gradually increased in the sound wave transmission direction, and finally, the opening area of the first opening 302A on the outlet side is ensured to be larger than the opening area of the second opening 302B on the inlet side.

In one embodiment, the ratio between the second open area and the first open area is greater than or equal to 0.46 and less than or equal to 0.52.

Specifically, as a defining way having the same defining effect as that of the ratio between the second opening area and the first opening area being greater than or equal to 0.46 and less than or equal to 0.52, the opening areas are converted into corresponding opening sizes, including but not limited to length and width, i.e., the ratio between the opening size of the second opening and the opening size of the first opening being greater than or equal to 0.68 and less than or equal to 0.72.

Preferably, the ratio between the second aperture and the first aperture is 0.71.

It can be understood by those skilled in the art that, when the second through hole 302 is a circular hole, the opening size of the first opening and the opening size of the second opening are both diameters, and when the second through hole 302 is an elongated hole, the first aperture and the second aperture may be apertures in the width direction and the length direction.

For example, in a structure of the LED display unit, the first aperture and the second aperture are both width-directional apertures, the first aperture is 1.7mm, the second aperture is 2.4mm, and a ratio of the first aperture to the second aperture is 0.71.

In this embodiment, by defining the ratio range between the first opening area and the second opening area to configure the second through hole 302 based on the ratio range, on the one hand, it is possible to prevent the areas of the first opening and the second opening from being closer to each other when the ratio is larger, affecting the sound transmission effect; on the other hand, when the ratio is small, the difference in area between the first opening and the second opening is large, that is, the second opening is too small, and the transmission effect of the sound wave is prevented from being affected.

In one embodiment, the angle of expansion of the second through hole may be further defined, and specifically, the taper angle of the second through hole is 18 ° or more and 22 ° or less under the condition that the cross-sectional area of the second through hole is gradually increased from the second surface toward the first surface.

Wherein, in the lateral cross-sectional view shown in fig. 4, the taper angle of the second through-hole is the angle between two generatrices shown in the lateral cross-section of the second through-hole.

Preferably, the taper angle of the second through hole is 20 °.

In this embodiment, the expansion angle of the second through hole along the sound wave transmission direction is defined by defining the range of the taper angle of the second through hole, and the second through hole 302 is constructed based on the range of the taper angle, which is also beneficial to improving the sound wave transmission effect, and is beneficial to reducing the attenuation of the sound wave in the middle and high frequency band by forming the sound-transmitting channel with the approximate exponential design in combination with the first through hole 102.

In addition, the sound wave input end of each sound transmission channel, namely the second opening, and the sound wave output end, namely the opening on the side of the circuit board provided with the light-emitting element are approximately equal to each other in distance from the sound wave input end to the sound wave output end, and each transmission channel is designed in an approximately exponential mode, so that the sound wave transmission channels can enable the phases of sound waves from each input channel to the output end to be approximately consistent, and further the sensitivity of sound waves in middle and high frequency band transmission can be greatly improved.

In one embodiment, the light emitting elements 20 are arranged in an array on one side of the circuit board 10; the first through hole 102 includes a first elongated hole, and a plurality of first elongated holes are spaced apart between two adjacent rows of light emitting elements 20; the second through-hole 302 comprises a second elongated hole adapted to the first elongated hole.

Specifically, the first elongated hole and the second elongated hole include at least one of an elongated circular hole, and a rectangle.

In this embodiment, the plurality of light emitting elements 20 are arranged on the circuit board 10 in an array manner to ensure the uniformity of the display of the LED display unit, and the first elongated holes are formed between two adjacent rows of light emitting elements 20 as the first through holes 102, so that on one hand, the first through holes 102 for sound transmission are advantageously disposed by fully utilizing the limited space between the light emitting elements 20, thereby greatly improving the perforation rate and the perforation area, achieving a good sound transmission effect, not affecting the wiring of the circuit board 10, having a good sound transmission effect and no influence on the display function, and the sound transmission LED screen manufactured by using the display unit can meet the requirement of sound attenuation of the projection screen specified in JB/T7809-2005 projection screen characteristic parameters and determination methods.

In addition, by configuring the first through holes 102 as elongated holes extending in the direction of each row of light emitting elements 20, the number of holes can be reduced while ensuring the area of the through holes, which is advantageous for improving the manufacturing efficiency of the circuit board 10.

In one embodiment, the distance between two adjacent rows of light emitting elements 20 is greater than or equal to 5mm, which can also be understood as the distance between two adjacent rows of light emitting elements 20 is greater than or equal to 5 mm.

In this embodiment, the arrangement distance between two adjacent rows of light emitting elements 20 on the printed board of the circuit board 10 is set to be greater than or equal to 5mm, on one hand, the display effect of the LED display unit can be ensured, on the other hand, a blank area without other devices is formed between two adjacent rows of light emitting elements 20, the first through hole 102 for circuit wiring processing of the circuit board 10 can be avoided in the space, so that a plurality of sound transmission channels are formed in the bottom board 30 and the circuit board 10 by utilizing the space as much as possible, thereby improving the transmission efficiency of sound waves passing through the LED display unit by improving the punching rate of the LED display unit, further ensuring that the whole mounted LED display screen has a good sound transmission function, and correspondingly, greatly reducing the high-frequency attenuation of the sound waves.

In one embodiment, between two adjacent rows of light emitting elements 20, the ratio between the spacing between two adjacent first elongated holes and the length of the first elongated holes is greater than or equal to 0.9 and less than or equal to 1.1.

In this embodiment, by defining the ratio between the distance between two adjacent first elongated holes and the length of the first elongated hole, on the one hand, the uniform distribution of the first through holes on the circuit board 10 can be ensured, and further the uniformity of the distribution of the sound wave penetration region, that is, the sound wave penetration effect, can be ensured, and the transmission effect is prevented from being affected.

Preferably, the ratio between the spacing between two adjacent first elongated holes and the length of the first elongated holes is 1, and as shown in fig. 6, assuming that the distance between two adjacent light emitting elements 20 and the length of the light emitting elements 20 are both L, the length of one first elongated hole is 5L, and the distance between two first elongated holes is also 5L.

The structure for the bottom plate 30 includes, but is not limited to, the following two forms:

in a first embodiment, as shown in fig. 5, the second surface of the bottom plate 30A is a plane, and a second through hole 302 is formed in the plane.

In a second form, as shown in fig. 6, a plurality of ribs are protruded from the second surface of the bottom plate 30B to form a curved surface, and a second through hole 302 is formed between two adjacent ribs.

In one embodiment, the bottom plate 30 has a plurality of rows of ribs on the surface not attached to the circuit board 10, i.e., the second surface; the second through hole 302 is opened between two adjacent reinforcing ribs.

In this embodiment, through setting up multirow strengthening rib, be favorable to promoting the intensity of bottom plate, and then guarantee whole LED display element's packaging strength.

As shown in fig. 6, in one embodiment, the stiffener is configured as a V-shaped stiffener 304; and the V-shaped reinforcing ribs adjacent to each other form a gradually narrowed groove, and the bottom of the gradually narrowed groove is provided with a second through hole.

In this embodiment, the reinforcing ribs 304 with the V-shaped structure are disposed on the second surface of the bottom plate 30, and before the sound wave is transmitted to the sound-transmitting channel, the sound wave is transmitted into the grooves, the grooves configure the second surface of the bottom plate into the streamline structure, and the streamline structure is favorable for smoothly guiding the sound wave into the sound-transmitting channel formed by the first through hole and the second through hole, so that the influence of the abrupt structural change on the sound quality, the sound radiation loss and the medium-high frequency attenuation is greatly reduced.

In one embodiment, the first via 102 has an opening ratio of greater than or equal to 12% and less than or equal to 20% on the circuit board 10.

In this embodiment, the opening ratio of the second through hole 302 on the bottom plate 30 is limited to be greater than or equal to 12% and less than or equal to 20% by defining the opening ratio of the first through hole 102 on the circuit board 10, which may also be represented by the opening ratio.

Fig. 7 shows a schematic diagram of the comparison of the sound attenuation of each frequency when sound passes through the sound-transmitting channel constructed by the scheme of the present disclosure, wherein a curve 802 is a sound attenuation curve of each frequency when sound passes through the sound-transmitting channel constructed by the scheme of the present disclosure, and a curve 804 is a sound attenuation curve of each frequency when sound passes through the sound-transmitting channel constructed by the scheme of the present disclosure, and it can be known that when sound passes through the sound-transmitting channel constructed by the scheme of the present disclosure, the attenuation of the middle and high frequencies of the sound wave can be significantly reduced by comparing the curve 802 with the curve 804.

As shown in fig. 8, an LED screen according to an embodiment of the present disclosure includes: the box body support 40 is provided with a plurality of installation cavities which can be separated in the box body support 40; the LED display unit of any one of the above technical solutions is assembled in the installation cavity.

In this embodiment, the LED display unit includes a bottom plate and a circuit board, the circuit board is provided with a light emitting element, the LED display unit may be a box structure, a plurality of boxes are fixed in a mounting cavity partitioned by a box support to form an LED screen of the box structure, and the box support is a frame structure to ensure the sound transmission performance of the LED screen while assembling a plurality of LED display modules into the LED screen.

According to the LED display unit and the LED screen, the straight-through sound wave transmission channel is improved into the streamline sound wave transmission channel, so that the sound energy loss in the transmission process is reduced.

For the bottom plate and the circuit board which are mutually attached in the LED display unit, the bottom plate is provided with the horn holes with the areas gradually increased as the second through holes 302, the second through holes 302 are combined with the first through holes arranged on the circuit board to form sound-transmitting channels of sound waves, the sound-transmitting channels are provided with smooth side walls through the shape adaptation of the first channels and the second channels, and the horn-shaped sound-transmitting channel structure is combined, so that the sound wave interference effect and the Helmholtz resonance effect can be well inhibited, and the harmonic distortion generated in the sound transmission process is reduced.

In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. An LED display unit, comprising:

a circuit board;

the light-emitting elements are arranged on the circuit board, and a plurality of first through holes are formed in the circuit board in the areas where the light-emitting elements are not arranged;

the first surface of the bottom plate is attached to the surface, not provided with the light-emitting elements, of the circuit board, a plurality of second through holes are formed in the bottom plate, the second through holes are one by one opposite to the first through holes, the second through holes are communicated with the first through holes, the first opening area of the second through holes in the first surface of the bottom plate is larger than the second opening area in the second surface of the bottom plate, and the cross-sectional area of the first through holes is larger than or equal to the first opening area.

2. The LED display unit of claim 1,

the cross-sectional area of the second through hole is gradually increased from the second surface to the first surface;

or the cross-sectional area of the second through hole is gradually reduced and then gradually increased from the second surface to the first surface.

3. The LED display unit of claim 2,

a ratio between the second opening area and the first opening area is greater than or equal to 0.46 and less than or equal to 0.52; and/or

Under the condition that the cross-sectional area of the second through hole gradually increases from the second surface toward the first surface, the taper angle of the second through hole is 18 ° or more and 22 ° or less.

4. The LED display unit of claim 1,

the plurality of light-emitting elements are arranged on the circuit board in an array manner;

the first through hole comprises a first elongated hole, and a plurality of first elongated holes are formed between two adjacent rows of the light-emitting elements at intervals;

the second through hole comprises a second elongated hole adapted to the first elongated hole,

wherein the first and second elongated holes comprise at least one of an elongated round hole, and a rectangle.

5. The LED display unit of claim 4,

the distance between two adjacent rows of the light-emitting elements is greater than or equal to 5 mm.

6. The LED display unit of claim 4,

between two adjacent rows of the light-emitting elements, the ratio of the distance between two adjacent first elongated holes to the length of the first elongated hole is greater than or equal to 0.9 and less than or equal to 1.1.

7. The LED display unit of claim 1,

a plurality of rows of reinforcing ribs are arranged on the second surface of the bottom plate in parallel;

the second through hole is formed between two adjacent reinforcing ribs.

8. The LED display unit of claim 7,

the reinforcing ribs are configured as V-shaped reinforcing ribs;

and a gradually narrowed groove is formed in two adjacent V-shaped reinforcing ribs, and the bottom of the groove is provided with the second through hole.

9. LED display unit according to any of claims 1 to 8,

the opening ratio of the first through hole on the circuit board is greater than or equal to 12% and less than or equal to 20%.

10. An LED screen, comprising:

the box body support is internally provided with a plurality of installation cavities in a separating way;

the LED display unit of any one of claims 1 to 9, fitted within the mounting cavity.

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