A design method for a PCB board of an LED display module, the PCB board, and an LED movie display screen

Abstract

The present invention belongs to the technical field of LED movie screens, and specifically provides a design method for a PCB board of an LED display module, a PCB board, and an LED movie display screen. The method uses a double-sided drilling method for the PCB board to generate sound transmission holes of the LED display module PCB board, and performs area matching between the sound transmission holes and the pixel points on the LED display module. Each sound transmission hole of the PCB board is in the shape of a two-way split horn. Through the design of the hole shape and the drilling direction of the drilled PCB board, the overlap of sound waves is effectively reduced, the return of sound is reduced, and the utilization rate of sound is improved. The hole shape is in the shape of a horn, which can effectively control the propagation direction of sound and reduce sound dispersion, thereby improving the directivity of sound.

Description

Technical Field

[0001] The present invention relates to the technical field of LED movie screens, and particularly to a design method for a PCB board of an LED display module, the PCB board, and an LED movie display screen. Background Art

[0002] LED movie screens, with their technical features such as high brightness, high contrast, high dynamic range, high brightness uniformity, and high color gamut, have brought revolutionary changes to movie projection and provided audiences with a brand-new viewing experience. Currently, digital movie LED screens all use fully enclosed boxes, with almost no sound permeability. The main speaker system cannot be installed behind the screen in the traditional mode and can only be placed around the LED screen. This layout results in the inconsistency between the position where the audience hears the sound and the position of the sound in the image, and it is impossible to achieve the ideal sound and picture synchronization effect, which has become a major factor restricting the development of digital movie LED halls.

[0003] Conventional mechanical drills are used for drilling holes in traditional PCB boards, with a cylindrical shape and a diameter ranging from about 1.5 mm to 3 mm. Although the traditional drilling method can conduct a part of the sound, for the vast majority of sound waves, they will be blocked and lost due to the PCB board material, causing a large loss to the sound propagation of the speakers behind the cinema screen, and at the same time, it will also lead to the return of sound, resulting in a serious problem of sound wave overlap. Summary of the Invention

[0004] In view of the fact that the traditional drilling method for PCB boards will block and lose the vast majority of sound waves due to the PCB board material, causing a large loss to the sound propagation of the speakers behind the cinema screen, and at the same time, it will also lead to the return of sound, resulting in a serious problem of sound wave overlap, the present invention provides a design method for a PCB board of an LED display module, the PCB board, and an LED movie display screen.

[0005] In the first aspect, the technical solution of the present invention provides a design method for a PCB board of an LED display module. The method uses a double-sided drilling method for the PCB board to generate sound-transmitting holes for the PCB board of the LED display module, and performs area matching between the sound-transmitting holes and the pixel points on the LED display module. Each sound-transmitting hole of the PCB board has a two-way split horn shape.

[0006] As a preference of the technical solution of the present invention, the steps of using a double-sided drilling method for the PCB board to generate sound-transmitting holes for the PCB board of the LED display module and performing area matching between the sound-transmitting holes and the pixel points on the LED display module include:

[0007] Place the PCB board on an automatic drilling device, and the connecting rod of the contact limit switch on the device presses on the PCB board, and convey the PCB board until it reaches the specified position;

[0008] Obtain the thickness of the PCB board and the number of drilled holes; the number of drilled holes is set according to the pixel points on the LED display module;

[0009] Set the drilling depth of the drill bit according to the thickness of the PCB board;

[0010] Scan the PCB board to locate the initial drilling position and move the drill bit to the initial drilling position;

[0011] Start the device and drill holes at the position on the PCB board. After the drilling is completed, record the number of drilling times, and raise the drill bit to return to the original position;

[0012] When the recorded number of drilling times is less than the number of drilled holes, scan the PCB board to locate the next drilling position and move the drill bit to that position, and execute the steps: start the device and drill holes at the position on the PCB board. After the drilling is completed, record the number of drilled holes, and raise the drill bit to return to the original position;

[0013] When the recorded number of drilling times is equal to the number of drilled holes, determine whether the turning parameter is set to 1;

[0014] If so, transport the drilled PCB board to the original position, and the drilling is completed;

[0015] If not, transport the single-sided drilled PCB board to the original position, press the connecting rod of the limit switch to close, turn over the PCB board, set the turning parameter to 1 and clear the recorded number of drilling times at the same time. The connecting rod of the contact limit switch on the device presses on the PCB board, and transport the PCB board until the specified position; execute the steps: start the device and drill holes at the position on the PCB board. After the drilling is completed, record the number of drilling times, and raise the drill bit to return to the original position.

[0016] As a preference of the technical solution of the present invention, multiple rows of sound-transmitting holes are arranged on the PCB board, and each row of sound-transmitting holes is arranged at equal intervals along the length direction of the PCB board.

[0017] As a preference of the technical solution of the present invention, the outer diameter range of the holes of the sound-transmitting holes is 1.5 - 2 mm; the distance between adjacent sound-transmitting holes ≥ 2.9 mm.

[0018] As a preference of the technical solution of the present invention, the distance range at the joint of the two-way holes ≤ 0.02 mm.

[0019] As a preference of the technical solution of the present invention, the range of the effective hole opening rate of each PCB board is 5% - 7.5%.

[0020] As a preference of the technical solution of the present invention, the effective hole opening rate of the PCB board is 6.8%.

[0021] In a second aspect, the technical solution of the present invention further provides an LED display module PCB board, and the PCB board is a PCB board designed according to the method described in the first aspect.

[0022] In a third aspect, the technical solution of the present invention further provides a movie display screen, including a box body and at least one LED display module. The LED display module is fixed on the box body, and the LED display module includes the PCB board described in the second aspect.

[0023] As a preference of the technical solution of the present invention, the LED display module and the box body are isolated by copper pillars.

[0024] As a preference of the technical solution of the present invention, the box body includes an LED control power supply, an LED receiving card, and a box body kit. The LED control power supply and the LED receiving card are fixed on the box body kit;

[0025] The LED control power supply is used to control the on / off of the movie display screen, and the LED receiving card is used to receive the signal transmitted by the sending end;

[0026] The LED display module includes an LED display module and a bottom shell kit; the LED display module is fixedly connected to the bottom shell kit by screws; the LED display module includes the PCB board.

[0027] As a preference of the technical solution of the present invention, it further includes a control system device. The control system device includes an LED sending card, a sending card power supply, and supporting wires. The LED sending card is used to transmit the signal to the LED receiving card.

[0028] It can be seen from the above technical solutions that the present invention has the following advantages: By designing the hole shape and punching direction of the punched PCB board, the overlap of sound waves is effectively reduced, the return of sound is reduced, and the utilization rate of sound is improved. The hole shape adopts a horn shape, which can effectively control the propagation direction of sound and reduce sound dispersion, thereby improving the directivity of sound; at the same time, the horn shape can enhance or attenuate sounds of specific frequencies, thereby improving the frequency response of the system; finally, the horn shape can amplify sound, increase the sound pressure level, and expand the sound wave amplitude, making the sound louder. The holes are bidirectionally open, and this design can achieve the superposition effect of sound waves, making the sound richer and fuller at specific frequencies; providing a wider frequency response range, reducing resonance and distortion; improving the directivity of the horn, making the sound more concentrated in a specific direction and reducing sound diffusion; optimizing the sound wave path and reducing acoustic interference such as echoes. The LED display module is independent of the box body through copper pillars, reducing the damage of sound resonance to the module and ensuring the service life of the movie screen. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic flowchart of the method according to an embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of the sound transmission holes on the PCB board according to an embodiment of the present invention.

[0032] Figure 3 It is a schematic diagram of the movie display screen in the embodiment of the present invention. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The embodiment of the present invention provides a design method for an LED display module PCB board. The method generates sound transmission holes on the LED display module PCB board by using the double-sided drilling method of the PCB board, matches the areas of the sound transmission holes with the pixel points on the LED display module, and each sound transmission hole on the PCB board is in the shape of a two-way split speaker.

[0035] In some embodiments, as Figure 1 shown, the steps of generating sound transmission holes on the LED display module PCB board by using the double-sided drilling method of the PCB board and matching the areas of the sound transmission holes with the pixel points on the LED display module include:

[0036] S1: Place the PCB board on the automatic drilling device, press the connecting rod of the contact limit switch on the device against the PCB board, and convey the PCB board to the specified position;

[0037] S2: Obtain the thickness of the PCB board and the number of drill holes; the number of drill holes is set according to the pixel points on the LED display module;

[0038] S3: Set the drilling depth of the drill bit according to the thickness of the PCB board;

[0039] S4: Scan the PCB board to locate the initial drilling position and move the drill bit to the initial drilling position;

[0040] S5: Start the device and drill holes at the said position on the PCB board. After the drilling is completed, record the number of drill holes, and move the drill bit upward to restore it to the original position;

[0041] S6: Whether the recorded number of drill holes is less than the number of punching holes;

[0042] If yes, execute step S7; if no, execute step S8;

[0043] S7: Scan the PCB board to locate the next punching position and move the drill bit to the said position, and execute step S5;

[0044] S8: At this time, the recorded number of drill holes is equal to the number of punching holes. Determine whether the flipping parameter is set to 1;

[0045] If yes, execute step S10;

[0046] If no, execute step S9;

[0047] S9: Transport the single-sided punched PCB board to the original position, open the link of the limit switch to press and fit, flip the PCB board, set the flipping parameter to 1 and clear the recorded number of drill holes at the same time. The link of the contact limit switch on the device presses on the PCB board, and transport the PCB board until the specified position; execute step S5;

[0048] S10: Transport the punched PCB board to the original position, and the punching of a single PCB board is completed.

[0049] During the punching process, in some embodiments, the drill bit is a frustum-shaped drill bit, the area of the front end of the drill bit is smaller than the area of the back end of the head, and the front end of the drill bit is the end in contact with the PCB board; wherein, the difference between the depth of the single-sided drilling and half of the thickness of the PCB board is less than or equal to the set spacing threshold. In some embodiments, the drill bit is a conical drill bit, and the sound transmission holes formed by drilling on both sides are in the shape of an opening trumpet as Figure 2 shown.

[0050] This method adopts a drilling method to punch holes in the PCB board of the LED module, and matches the sound transmission holes with the pixel points on the LED module, so that each LED module occupies a part of the sound transmission area, which not only achieves the sound transmission effect, but also reduces the space of the PCB board. The direction of the sound transmission holes is double-sided independent drilling, and the shapes of the double-sided drilling of the PCB board are both trumpet-shaped, and the trumpet shapes of each sound transmission hole are opened in opposite directions, which solves the problem that the traditional cylindrical sound transmission holes damage the sound, and does not affect the overall display effect and the integrity of the overall structure of the screen. At the same time, in order to reduce sound resonance, we add copper columns between the LED display module and the box body, so that each module is not completely attached to the box body, alleviating the damage caused by the sound vibration of the LED display module, and ensuring the service life of the entire movie screen.

[0051] When double-sided drilling a through-hole on the same PCB board, the specific process of preparing the PCB board for drilling is as follows: First, place the PCB board on the automatic PCB board drilling device. The connecting rod of the contact limit switch on the device presses on the pre-drilled PCB board. Turn on the power switch. The PCB board conveyor platform carries the pre-drilled PCB board forward until the specified position. At this time, the driving motors of the drill bit and the lead screw start. The lead screw drives the rotating drill bit to descend and drill a hole at the specified position on the PCB board. After the drilling is completed, the lead screw drives the rotating drill bit to ascend and return to the original position. The driving motors of the drill bit and the lead screw stop working. The PCB board conveyor platform carries the drilled PCB board backward to the original position. Open the connecting rod of the limit switch to press and turn over the PCB board, and then drill according to the above process.

[0052] By setting the program of the automatic PCB board drilling device, the one-way drilling depth is set to only half of the thickness of the PCB board, that is, the total depth of the double-sided drilling is the total thickness of the PCB board. Due to the inherent error of the PCB automatic drilling device, the spacing range at the seam of the double-sided holes is ≤0.02mm.

[0053] The through-holes of the drilled PCB board are arranged at equal intervals along the length direction of the PCB board. Each LED display module includes a drilled PCB board. It should be noted that the number of LED display modules in the digital cinema LED screen can be arbitrary, which means the number of drilled PCB boards can be arbitrary. The present invention patent does not limit the number of holes on the drilled PCB board. For example, the number of holes on a single drilled PCB board is 2412, the effective opening rate is 6.8%, and the size of the drilled PCB board is 250*250*1.6mm; the outer diameter of the holes is 1.5 - 2mm; the hole spacing is ≥2.9mm.

[0054] A plurality of rows of through-holes are provided on the PCB board, and each row of through-holes is arranged at equal intervals along the length direction of the PCB board.

[0055] The embodiment of the present invention also provides an LED display module PCB board. The PCB board is a PCB board designed according to the method described in the above embodiment. A schematic diagram of a row of through-holes 401 on the PCB board 44 is as Figure 2 shown.

[0056] As Figure 3 shown, the embodiment of the present invention also provides a movie display screen, including a box body 11 and at least one LED display module 22. The LED display module 22 is fixed on the box body 11, and the LED display module includes the PCB board as described in the second aspect.

[0057] The LED display module 22 is isolated from the box body 11 by copper posts 33, which reduces the resonance of the LED display module, ensures the sound transmission effect and increases the service life of the digital cinema LED screen at the same time.

[0058] In some embodiments, the box body includes an LED control power supply, an LED receiving card and a box body kit, and the LED control power supply and the LED receiving card are fixed on the box body kit;

[0059] The LED control power supply is used to control the switch of the movie display screen, and the LED receiving card is used to receive the signal transmitted by the sending end; the LED display module includes an LED display module and a bottom shell kit; the LED display module is fixedly connected to the bottom shell kit by screws; the LED display module includes the PCB board. A control system device is further included, and the control system device includes an LED sending card, a sending card power supply and supporting wires, and the LED sending card is used to transmit the signal to the LED receiving card.

[0060] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution is prior or subsequent. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0061] Although the present invention has been described in detail by referring to the accompanying drawings and in combination with the preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, those of ordinary skill in the art can make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions should all be within the scope of the present invention / any person familiar with the technical field of the present invention can easily think of changes or substitutions within the technical scope disclosed by the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A design method for a PCB board of an LED display module, characterized in that, The method uses a double-sided drilling method of a PCB board to generate sound-transmitting holes on a PCB board of an LED display module, and performs regional matching between the sound-transmitting holes and pixel points on the LED display module. Each sound-transmitting hole on the PCB board is in the shape of a two-way split speaker. The steps of generating the sound-transmitting holes of the PCB board of the LED display module by double-sided drilling of the PCB board and performing area matching between the sound-transmitting holes and the pixel points on the LED display module include: Place the PCB board on the automatic punching device, press the connecting rod of the contact limit switch on the device onto the PCB board, and transport the PCB board to the specified position; Obtain the thickness and number of holes of the PCB board; the number of holes is set according to the pixel points on the LED display module; Set the drilling depth of the drill bit according to the thickness of the PCB board; Scan the PCB board to locate the initial punching position and move the drill bit to the initial punching position; Start the device and drill holes at the position on the PCB board, finish drilling and record the number of drillings, and move the drill head upward to return to its original position; When the recorded number of drillings is less than the number of holes punched, the PCB board is scanned to locate the next hole punching position and the drill head is moved to the position, and the steps are performed: the device is started and holes are drilled at the position on the PCB board, the drilling is completed and the number of holes punched is recorded, and the drill head is moved upward to return to the original position; When the recorded drilling times are equal to the punching quantity, it is determined whether the flipping parameter is set to 1; If yes, the punched PCB board is transported to the original location and the punching is completed; If not, transport the single-sided punched PCB board to its original position, open the connecting rod of the limit switch and press it, turn the PCB board over, set the turning parameter to 1 and clear the recorded number of drillings, press the connecting rod of the contact limit switch on the device on the PCB board, and transport the PCB board to the specified position; execute the steps: start the device and drill holes at the said position on the PCB board, finish drilling and record the number of drillings, and move the drill head upward to return to its original position.

2. The design method of the LED display module PCB board according to claim 1, wherein The PCB board is provided with a plurality of rows of sound-transmitting holes, and each row of sound-transmitting holes is arranged at equal intervals along the length direction of the PCB board.

3. The design method of the LED display module PCB board according to claim 2, characterized in that The outer diameter of the sound-permeable holes ranges from 1.5 to 2 mm; the distance between adjacent sound-permeable holes is ≥ 2.9 mm.

4. The design method of the LED display module PCB board according to claim 2, characterized in that, The spacing range of the bidirectional hole joints is ≤0.02mm.

5. An LED display module PCB board, characterized in that, The PCB board is a PCB board designed according to the method described in any one of claims 1 to 4.

6. A movie display screen, characterized in that, It comprises a box body and at least one LED display module, wherein the LED display module is fixed on the box body, and the LED display module comprises the PCB board as claimed in claim 5.

7. The movie display screen according to claim 6, characterized in that, The LED display module is isolated from the box by a copper column.

8. The movie display screen according to claim 6 or 7, characterized in that, The box includes an LED control power supply, an LED receiving card and a box kit, and the LED control power supply and the LED receiving card are fixed on the box kit; The LED control power supply is used to control the switch of the movie display screen, and the LED receiving card is used to receive the signal transmitted by the sending end; The LED display module includes an LED display module and a bottom shell kit; The LED display module is fixedly connected to the bottom shell kit via screws; the LED display module includes the PCB board.

9. The movie display screen according to claim 8, characterized in that, It further includes a control system device, and the control system device includes an LED sending card, a power supply for the sending card, and supporting wires. The LED sending card is used to transmit signals to the LED receiving card.

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