Design method of PCB (printed circuit board) of LED (light-emitting diode) display module, PCB and LED movie display screen

Abstract

The invention belongs to the technical field of LED movie screens, and particularly provides a design method of an LED display module PCB, a PCB and an LED movie display screen, according to the method, sound transmission holes of the LED display module PCB are generated in a PCB double-face drilling mode, region matching is conducted on the sound transmission holes and pixel points on the LED display module, and each sound transmission hole of the PCB is in a two-way split horn shape. Through the design of the hole shape and the punching direction of the punched PCB, the overlapping of sound waves is effectively reduced, the return of sound is reduced, and the utilization rate of the sound is improved. And the holes are trumpet-shaped, so that the propagation direction of the sound can be effectively controlled, the sound dispersion is reduced, and the directness of the sound is improved.

Description

Technical Field

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

[0002] LED movie screens, with their high brightness, high contrast, high dynamic range, high brightness uniformity, high color gamut and other technical features, have brought revolutionary changes to movie screenings and provided audiences with a brand new viewing experience. At present, 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 way and can only be placed around the LED screen. This layout causes the sound position heard by the audience to be inconsistent with the image sound position, and it is impossible to achieve the ideal sound and picture co-location effect, which has become a major factor restricting the development of digital movie LED theaters.

[0003] Conventional PCB boards are punched with conventional mechanical drills, which are cylindrical in shape and have diameters ranging from about 1.5mm to 3mm. Although the traditional punching method can conduct some sound, most of the sound waves will be blocked and lost due to the PCB board, causing great loss to the sound propagation behind the theater screen, and also causing sound return, resulting in serious sound wave overlap problems. Summary of the invention

[0004] With respect to the traditional punching method of PCB boards, most sound waves will be blocked and lost due to the PCB board material, causing great loss to the sound propagation behind the theater screen, and also causing sound return, resulting in serious sound wave overlap problems. The present invention provides a design method for an LED display module PCB board, a PCB board and an LED movie display screen.

[0005] In a 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 of the PCB board to generate sound-transmitting holes of the PCB board of the LED display module, and regionally matches the sound-transmitting holes with pixel points on the LED display module. Each sound-transmitting hole of the PCB board is in the shape of a two-way split speaker.

[0006] As a preferred embodiment of the technical solution of the present invention, the sound-transmitting holes of the PCB board of the LED display module are generated by double-sided drilling of the PCB board, and the steps of regionally matching the sound-transmitting holes with 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.

[0007] As a preferred embodiment of the technical solution of the present invention, a plurality of 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.

[0008] As a preferred embodiment of the technical solution of the present invention, the outer diameter of the sound-transmitting holes ranges from 1.5 to 2 mm; and the distance between adjacent sound-transmitting holes is ≥2.9 mm.

[0009] As a preferred embodiment of the technical solution of the present invention, the spacing range of the bidirectional hole joints is ≤0.02mm.

[0010] As a preferred embodiment of the technical solution of the present invention, the effective opening rate of each PCB board is in the range of 5%-7.5%.

[0011] As a preferred embodiment of the technical solution of the present invention, the effective opening rate of the PCB board is 6.8%.

[0012] In a second aspect, the technical solution of the present invention further provides a LED display module PCB board, wherein the PCB board is a PCB board designed according to the method described in the first aspect.

[0013] In a third aspect, the technical solution of the present invention further provides a movie display screen, comprising a box and at least one LED display module, wherein the LED display module is fixed on the box, and the LED display module comprises the PCB board as described in the second aspect.

[0014] As a preferred embodiment of the technical solution of the present invention, the LED display module and the box are isolated by a copper column.

[0015] As a preferred embodiment of the technical solution of the present invention, 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 comprises an LED display module and a bottom shell kit; the LED display module and the bottom shell kit are fixedly connected by screws; and the LED display module comprises the PCB board.

[0016] As a preferred embodiment of the technical solution of the present invention, a control system device is also included, wherein the control system device includes an LED sending card, a sending card power supply and matching wires, and the LED sending card is used to transmit signals to the LED receiving card.

[0017] 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 perforated 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 trumpet-shaped shape, which can effectively control the propagation direction of sound and reduce sound dispersion, thereby improving the directness of sound; at the same time, the trumpet shape can enhance or attenuate the sound of a specific frequency, thereby improving the frequency response of the system; finally, the trumpet shape can amplify the sound, increase the sound pressure level, expand the amplitude of the sound wave, and make the sound louder. The hole adopts a two-way opening, and this design can achieve the superposition effect of sound waves, making the sound richer and fuller at a specific frequency; providing a wider frequency response range, reducing resonance and distortion; improving the directivity of the speaker, making the sound more concentrated in a specific direction, reducing the diffusion of sound; optimizing the sound wave path, and reducing acoustic interference, such as echo. The LED display module is independent of the box through the copper column, which reduces the damage to the module caused by sound resonance and ensures the service life of the movie screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 is a schematic flow chart of a method according to an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of a sound-permeable hole of a PCB board according to an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of a movie display screen in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] An embodiment of the present invention provides a design method for a PCB board of an LED display module. The method generates sound-transmitting holes of the PCB board of the LED display module by drilling holes on both sides of the PCB board, and regionally matches the sound-transmitting holes with pixel points on the LED display module. Each sound-transmitting hole of the PCB board is in the shape of a two-way split speaker.

[0024] In some embodiments, Figure 1 As shown, 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 regional matching between the sound-transmitting holes and the pixel points on the LED display module include: S1: Place the PCB on the automatic punching device, press the connecting rod of the contact limit switch on the device onto the PCB, and transport the PCB to the designated position; S2: 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; S3: Set the drilling depth of the drill bit according to the thickness of the PCB board; S4: Scan the PCB board to locate the initial drilling position and move the drill bit to the initial drilling position; S5: 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; S6: Whether the recorded number of drillings is less than the number of punchings; If yes, go to step S7; if no, go to step S8; S7: Scan the PCB board to locate the next drilling position and move the drill bit to the position, and execute step S5; S8: At this time, the recorded number of drillings is equal to the number of holes punched, and it is determined whether the flipping parameter is set to 1; If yes, execute step S10; If not, execute step S9; S9: transport the single-sided punched PCB board to the original position, open the connecting rod of the limit switch to press, turn the PCB board over, set the turning parameter to 1 and clear the recorded drilling times, 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 step S5; S10: The punched PCB board is transported to the original position, and the punching of the single PCB board is completed.

[0025] During the drilling process, in some embodiments, the drill bit is a truncated cone drill bit, the area of ​​the front end of the drill bit is smaller than the area of ​​the rear end of the end, and the front end of the drill bit is the end that contacts the PCB board; wherein the difference between the depth of the single-sided drilling and half the thickness of the PCB board is less than or equal to the set spacing threshold. In some examples, the drill bit is a conical drill bit, and the sound-permeable hole formed by drilling holes on both sides is in the shape of a split horn, such as Figure 2 shown.

[0026] This method uses drilling to punch holes in the PCB board of the LED module, and matches the sound-transmitting holes with the pixel points on the LED module, so that each LED module occupies a part of the sound-transmitting area, which not only achieves the sound-transmitting effect, but also reduces the space of the PCB board. The sound-transmitting holes are drilled independently on both sides, and the double-sided drilling shapes of the PCB board are all trumpet-shaped. The trumpet-shaped openings of each sound-transmitting hole are opposite to each other, which solves the problem of sound damage caused by traditional cylindrical sound-transmitting holes, and does not affect the overall display effect of the screen and the integrity of the overall structure. 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, which alleviates the damage to the LED display module caused by sound vibration and ensures the service life of the entire movie screen.

[0027] When the same sound-permeable hole is punched on both sides, the specific preparation process of the punched PCB board is as follows: first, the PCB board is placed on the PCB board automatic punching device, the connecting rod of the contact limit switch on the device is pressed on the pre-punched PCB board, the power switch is turned on, and the PCB board conveying platform carries the pre-punched PCB board forward to the specified position. At this time, the driving motor of the drill bit and the nut screw rod is started, and the nut screw rod drives the rotating drill bit downward to drill a hole at the specified position on the PCB board. After the drilling is completed, the nut screw rod drives the rotating drill bit upward to return to its original position, the driving motor of the drill bit and the nut screw rod stops working, and the PCB board conveying platform carrying the punched PCB board retreats to its original position, the connecting rod of the limit switch is opened and pressed, the PCB board is turned over, and then the holes are punched according to the above process.

[0028] By setting the program of the PCB automatic punching device, the unidirectional punching depth is set to only half of the PCB thickness, that is, the total depth of the bidirectional punching is the total thickness of the PCB. Due to the inherent error of the PCB automatic punching device, the spacing range of the bidirectional hole joints is ≤0.02mm.

[0029] The sound-transmitting holes of the perforated PCB board are arranged at equal intervals along the length direction of the PCB board. Each LED display module contains a perforated PCB board. It should be noted that the number of LED display modules in the digital movie LED screen can be arbitrary, which means that the number of perforated PCB boards can be arbitrary. The patent of this invention does not limit the number of holes in the perforated PCB board. For example, the number of holes in a single perforated PCB board is 2412, the effective opening rate is 6.8%, and the size of the perforated PCB board is 250*250*1.6mm; the outer diameter of the hole is 1.5~2mm; the hole spacing is ≥2.9mm.

[0030] 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.

[0031] The embodiment of the present invention further provides a PCB board of an LED display module, wherein the PCB board is a PCB board designed according to the method described in the above embodiment, and a schematic diagram of a row of sound-transmitting holes 401 on the PCB board 44 is shown in FIG. Figure 2 shown.

[0032] like Figure 3 As shown, an embodiment of the present invention further provides a movie display screen, comprising a box 11 and at least one LED display module 22, wherein the LED display module 22 is fixed on the box 11, and the LED display module comprises the PCB board as described in the second aspect.

[0033] The LED display module 22 is isolated from the box 11 by the copper column 33. The resonance of the LED display module is reduced, the sound transmission effect is ensured, and the service life of the digital movie LED screen is increased.

[0034] In some embodiments, 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 by screws; the LED display module includes the PCB board. It also includes a control system device, which includes an LED sending card, a sending card power supply and matching wires, and the LED sending card is used to transmit the signal to the LED receiving card.

[0035] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0036] Although the present invention has been described in detail with reference 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, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and these modifications or substitutions shall be within the scope of the present invention. Any person of ordinary skill in the art may easily think of changes or substitutions within the technical scope disclosed by the present invention, and these shall be within the scope of protection 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 of a PCB board of an LED display module, and regionally matches the sound-transmitting holes with pixel points on the LED display module. Each sound-transmitting hole of the PCB board is in the shape of a two-way split speaker.

2. The design method of the LED display module PCB board according to claim 1, characterized in that: 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.

3. The design method of the LED display module PCB board according to claim 2, characterized in that: 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.

4. 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.

5. 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.

6. A 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 5.

7. 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 6.

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

9. The movie display screen according to claim 7 or 8, 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.

10. The movie display screen according to claim 9, characterized in that: It also includes a control system device, which includes an LED sending card, a sending card power supply and matching wires. The LED sending card is used to transmit signals to the LED receiving card.

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