A method for manufacturing ultra-fine wire type LED transparent display screen and display screen

Abstract

A method for manufacturing an ultra-fine wire type LED transparent display screen, comprising: coating a transparent pressure-sensitive adhesive on a transparent substrate; using ultra-fine wires to print a driving line and a power line on the transparent pressure-sensitive adhesive; using ultra-fine wires to print a soldering pad connected to both the driving line and the power line; connecting the other end of the driving line and the other end of the power line to a flexible circuit board; fixing the LED device on the soldering pad; and using a transparent non-conductive optical adhesive to bond the transparent substrate to a transparent front protective plate. The present invention replaces the traditional laser etching method by using ultra-fine wires to print the driving line and the power line, thereby reducing the cost by about 20%. The use of ultra-fine wires effectively reduces impedance and improves luminous efficiency, which can reach more than 80%. In addition, by printing ultra-fine wires, the spacing between LED devices can be effectively reduced, and the size limitation can be effectively broken through, helping to make a larger transparent display screen.

Description

Technical Field

[0001] The invention belongs to the field of transparent display screens, and in particular relates to a method for manufacturing an ultra-fine wire type LED transparent display screen and the display screen. Background Art

[0002] In recent years, the LED display application industry has developed steadily, and the overall scale has increased year by year. It has become an important part of the LED industry chain. LED display application products represented by LED display screens have been widely used in various fields of social economy. Driven by the application market, LED transparent display screens have become a hot topic in current research. They can enrich visual content without blocking the line of sight. They are widely used in subways, airports, glass plank roads, advertising media, chain stores, large shopping malls, corporate exhibition halls, museums, science and technology museums and other places.

[0003] The current manufacturing method of LED transparent display screens is: first, a transparent conductive layer is coated on a transparent substrate and a driving line is etched, then the LED device is fixed to one end of the electrode on the transparent substrate with a conductive adhesive, and then the external driving circuit is crimped to the other end of the driving line through ACF, and finally the front panel is bonded to the substrate with a transparent non-conductive material. However, the transparent display screen manufactured by the above method is costly, the resistance of the driving electrode formed is large, and the LED device is prone to uneven light emission. The power consumed on the electrode is much greater than the light emitting power, and the overall light emission efficiency is <50%. In addition, the density of LED devices is low, and the spacing is difficult to achieve 30mm. The width of a single LED transparent display screen is <1.2 meters. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for manufacturing an ultra-fine wire type LED transparent display screen. The method for manufacturing an ultra-fine wire type LED transparent display screen has a simple process and solves the problems of high production cost and low luminous efficiency. The present invention also provides an LED transparent display screen.

[0005] According to the first aspect of the present invention, the method for manufacturing an ultra-fine wire type LED transparent display screen comprises: coating a transparent pressure-sensitive adhesive on a transparent substrate; using ultra-fine wires to print a driving line and a power line on the transparent pressure-sensitive adhesive; using ultra-fine wires to print a soldering pad connected to both the driving line and the power line; connecting the other end of the driving line and the other end of the power line to a flexible circuit board; fixing an LED device on the soldering pad; and bonding the transparent substrate to a transparent front protective plate using a transparent non-conductive optical adhesive.

[0006] The method for manufacturing an ultra-fine wire type LED transparent display screen according to an embodiment of the present invention has at least the following technical effects: by using ultra-fine wires to print drive lines and power lines on transparent pressure-sensitive adhesive, the traditional laser etching method is replaced, and the cost is reduced by about 20%. And the use of ultra-fine wires as drive line and power line materials effectively reduces impedance and improves luminous efficiency, and the luminous efficiency can reach more than 80%. In addition, by printing ultra-fine wires, the spacing between LED devices can be effectively reduced to about 15mm. Using ultra-fine wire printing instead of traditional laser etching structure can also effectively break through size limitations. When using a single-sided outlet method, the size width can reach 1.8 meters, and when using a double-sided outlet method, it can reach 3.6 meters.

[0007] According to some embodiments of the present invention, there are N soldering pads, driving lines, and LED devices; there are M power lines; one end of the N driving lines is connected to the N soldering pads one-to-one; the other ends of the N driving lines are connected to the flexible circuit board; an LED device is fixed on each of the soldering pads; and the M power lines are used to supply power to the N LED devices.

[0008] According to some embodiments of the present invention, the transparent substrate is a flexible substrate.

[0009] According to the second aspect of the present invention, the LED transparent display screen includes: a transparent substrate for providing a carrier; a transparent pressure-sensitive adhesive layer, which is arranged on the upper surface of the transparent substrate; a soldering pad, which is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, and an LED device is fixed on the soldering pad; a driving line, which is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the soldering pad, and the other end is used to connect to a flexible circuit board; a power line, which is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the soldering pad, and the other end is connected to the flexible circuit board; a transparent front protective plate, which is arranged on the LED device and bonded to the transparent substrate by a transparent non-conductive optical adhesive.

[0010] The LED transparent display screen according to the embodiment of the present invention has at least the following technical effects: by using ultra-fine wires to replace the structure of transparent conductive layer laser etching, the cost is reduced by about 20%. And the use of ultra-fine wires as drive line and power line materials effectively reduces impedance and improves luminous efficiency, which can reach more than 80%. In addition, by using ultra-fine wire printing, the structure can be more compact, and the spacing between LED devices can be effectively reduced to about 15mm.

[0011] According to some embodiments of the present invention, there are N soldering pads, driving lines, and LED devices; there are M power lines; one end of the N driving lines is connected to the N soldering pads one by one; the other ends of the N driving lines are connected to the flexible circuit board; one LED device is fixed on each soldering pad; and the M power lines are used to supply power to the N LED devices.

[0012] According to some embodiments of the present invention, the diameter of each of the driving wires is 0.01 mm to 0.05 mm.

[0013] According to some embodiments of the present invention, the diameter of each of the power lines is 0.05 mm to 0.2 mm; and the total cross-sectional area of ​​the M power lines is 2 / 3 to 1 of the total cross-sectional area of ​​the N driving lines.

[0014] According to some embodiments of the present invention, there are multiple flexible circuit boards distributed on both sides of the transparent substrate; the N driving lines and the M power lines are all connected to the flexible circuit board closest to them.

[0015] According to some embodiments of the present invention, the LED device uses an RGB tri-color LED.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the second aspect of the present invention (without the LED component and the transparent front protection plate);

[0019] Figure 2 yes Figure 1 A magnified schematic diagram of a part in the figure;

[0020] Figure 3 is a schematic structural diagram of an embodiment of the second aspect of the present invention;

[0021] Figure 4 yes Figure 3 A magnified schematic diagram of a part in the figure.

[0022] Reference numerals:

[0023] Transparent substrate 100,

[0024] Pad 200,

[0025] Driving line 310, power line 320,

[0026] Flexible circuit board 400,

[0027] Transparent front protection plate 500,

[0028] LED device 600. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, if there is a description of first, second, third, fourth, etc., it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0031] In the description of the present invention, unless otherwise clearly defined, words such as setting and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0032] The following describes a method for manufacturing an ultra-fine wire type LED transparent display screen according to an embodiment of the first aspect of the present invention.

[0033] The method for manufacturing an ultra-fine wire type LED transparent display screen according to an embodiment of the present invention comprises: coating a transparent pressure-sensitive adhesive on a transparent substrate; printing a driving line and a power line on the transparent pressure-sensitive adhesive using an ultra-fine wire; printing a soldering pad connected to both the driving line and the power line using an ultra-fine wire; connecting the other end of the driving line and the other end of the power line to a flexible circuit board circuit; fixing an LED device on the soldering pad; and bonding the transparent substrate to a transparent front protective plate using a transparent non-conductive optical adhesive.

[0034] First, a transparent pressure-sensitive adhesive is applied to the transparent substrate, and then the driving line and the power line are printed on the transparent pressure-sensitive adhesive using ultra-fine wires, and the pads connected to the driving line and the power line are printed using ultra-fine wires. The other ends of the driving line and the power line that are not connected to the pads are connected to the flexible circuit board by crimping. Then the LED device is fixed on the pad, usually by laser spot welding. Finally, the transparent front protective plate is bonded to the substrate to complete the production. In actual printing, a part of the pad will continue to be printed out continuously after the driving line is printed, and a part of the pad will be printed directly after the power line is printed. Printing in this way can avoid printing the pads one by one and reduce the workload. When printing the power line, because the parallel method is adopted, usually after considering the structure of the LED device, the power lines of a row of pads will be printed in a continuous manner at one time, instead of printing one by one. When printing the power line and the driving line, the line outlet method will be adjusted according to the required printing size. When the size is small, the single-sided line outlet method is adopted, and when the size is large, the double-sided line outlet method is adopted. The ultra-fine wire printing is performed using a dedicated ultra-fine wire printing device, which can be a 3D printing device. The ultra-fine wire is usually made of ultra-fine copper wire. When ultra-low impedance wires are required, ultra-fine silver wires, ultra-fine gold wires or other metal materials can also be used.

[0035] According to the method for manufacturing an ultra-fine wire type LED transparent display screen according to an embodiment of the present invention, the method of printing the drive line and the power line on the transparent pressure-sensitive adhesive with ultra-fine wires replaces the traditional laser etching method, reducing the cost by about 20%. And the use of ultra-fine wires as the materials for the drive line and the power line effectively reduces the impedance and improves the luminous efficiency, which can reach more than 80%. In addition, by printing with ultra-fine wires, the spacing between LED devices can be effectively reduced to about 15mm. In addition, using ultra-fine wire printing instead of the traditional laser etching structure can effectively break through the size limitation. When using the single-sided outlet method, the size width can reach 1.8 meters, and when using the double-sided outlet method, it can reach 3.6 meters.

[0036] In some embodiments of the present invention, there are N solder pads, driving lines, and LED devices; there are M power lines; one end of the N driving lines is connected to the N solder pads one by one; the other ends of the N driving lines are connected to the flexible circuit board; an LED device is fixed on each solder pad; and the M power lines are used to power the N LED devices. The N LED devices can be controlled individually through the N driving lines. In addition, because it is an LED transparent display screen, the power line should not be too thick. Therefore, when encountering a large-sized LED transparent display screen, the power line needs to be divided into M, which not only ensures the power supply effect, but also does not block the line of sight.

[0037] In some embodiments of the present invention, the transparent substrate adopts a flexible substrate. The use of a flexible substrate can effectively improve toughness, and the improvement of toughness can increase the use of the product and also improve the product's resistance to external damage. The flexible substrate can adopt flexible PET or flexible transparent glass, and ordinary glass can be directly used in scenarios where the use of flexible materials is not required.

[0038] According to the second aspect of the present invention, the LED transparent display screen includes: a transparent substrate 100, a transparent pressure-sensitive adhesive layer, a soldering pad 200, a driving line 310, a power line 320, and a transparent front protective plate 500. The transparent substrate 100 is used to provide a carrier; the transparent pressure-sensitive adhesive layer is arranged on the upper surface of the transparent substrate 100; the soldering pad 200 is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, and an LED device 600 is fixed on the soldering pad 200; the driving line 310 is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the soldering pad 200, and the other end is used to connect to the flexible circuit board 400; the power line 320 is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the soldering pad 200, and the other end is connected to the flexible circuit board 400; the transparent front protective plate 500 is arranged on the LED device 600 and bonded to the transparent substrate 100 through a transparent non-conductive optical adhesive.

[0039] refer to Figures 1 to 4 , a transparent pressure-sensitive adhesive layer is provided on the transparent substrate 100, which can be used to fix the ultra-fine wire. The pad 200, the driving line 310, and the power line 320 are all ultra-fine wires, and one end of the driving line 310 and the power line 320 are respectively connected to the pad 200, and then the driving line 310 and the power line 320 are crimped together with the external head-shaped circuit board. The LED device 600 is fixed on the pad 200, and the LED device 600 is finally connected to the flexible circuit board 400 through the pad 200, the driving line 310, and the power line 320, and finally realizes the external control of the LED device 600. A transparent front protective plate 500 is also provided on the LED, and the transparent front protective plate 500 is bonded to the transparent substrate 100 to achieve the final protection. In actual use, due to the problem that the resistance value of the laser etching structure is large, it is difficult to make a larger size, and the use of an ultra-fine wire structure can effectively reduce the resistance value, thereby providing a basis for building a large-size LED transparent display screen. When printing ultra-fine wires, the drive wire 310 and the power wire 320 can be selected to be unilaterally extended or bilaterally extended according to actual needs.

[0040] According to the LED transparent display screen of the present invention, the cost is reduced by about 20% by using ultra-fine wires to replace the structure of transparent conductive layer laser etching. And the use of ultra-fine wires as the materials of the drive line 310 and the power line 320 effectively reduces the impedance and improves the luminous efficiency, and the luminous efficiency can reach more than 80%. In addition, by using the structure printed by ultra-fine wires, it can be more compact, and the spacing between the LED devices 600 can be effectively reduced to about 15mm. In addition, the use of ultra-fine wire structure can effectively break through the size limitation. When using the single-sided outlet method, the size width can reach 1.8 meters, and when using the double-sided outlet method, it can reach 3.6 meters.

[0041] According to the LED transparent display screen of the present invention, there are N solder pads 200, driving lines 310, and LED devices 600; there are M power lines 320; one end of the N driving lines 310 is connected to the N solder pads 200 in a one-to-one correspondence; the other ends of the N driving lines 310 are connected to the flexible circuit board 400; an LED device 600 is fixed on each solder pad 200; and the M power lines 320 are used to supply power to the N LED devices 600. The N driving lines 310 can be used to control the N LED devices 600 individually. In addition, because it is an LED transparent display screen, the power line 320 should not be too thick. Therefore, when encountering a large-sized LED transparent display screen, the power line 320 needs to be divided into M pieces, which not only ensures the power supply effect, but also does not block the line of sight.

[0042] In some embodiments of the present invention, the diameter of each driving line 310 is 0.01 mm to 0.05 mm, which will not increase the line resistance and reduce the luminous efficiency due to being too thin, nor will it affect the display effect due to being too thick.

[0043] In some embodiments of the present invention, the diameter of each power line 320 is 0.05 mm to 0.2 mm; the total cross-sectional area of ​​the M power lines 320 is 2 / 3 to 1 of the total cross-sectional area of ​​the N driving lines 310. If the diameter of the power line 320 is too large, it is easy to affect the field of view, but considering that a large current needs to pass through, it should not be too small, so the selection of the power line 320 needs to fully consider these two points.

[0044] In some embodiments of the present invention, there are multiple flexible circuit boards 400 and they are distributed on both sides of the transparent substrate 100; N driving lines 310 and M power lines 320 are all connected to the closest flexible circuit board 400. When the size of the transparent LED display is large, if a single flexible circuit board 400 is still used, the size of the flexible circuit board 400 will be very large. In addition, when facing the double-sided outlet of the power line 320 and the driving line 310, using multiple circuit boards to connect directly on both sides can also save a lot of wiring time, improve production efficiency, and also reduce the failure rate. At the same time, the use of double-sided outlets can also effectively reduce the resistance of the driving line and the power line, and improve the luminous efficiency.

[0045] In some embodiments of the present invention, the LED device 600 uses RGB tricolor LEDs. Using RGB tricolor LEDs can effectively improve user experience. In some occasions where colored light is not required, single-color LEDs can also be used directly to reduce the cost of use.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, the present invention is not limited to the above embodiments. Those skilled in the art will understand that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for manufacturing an ultra-fine wire type LED transparent display screen, characterized in that: The following steps are involved: Coating a transparent pressure-sensitive adhesive on a transparent substrate; Printing driving wires and power supply wires on the transparent pressure-sensitive adhesive using ultra-fine wires; Using ultra-fine wires to print pads connected to both the drive line and the power line; Connecting the other end of the driving line and the other end of the power line to the flexible circuit board; Fixing the LED device on the soldering pad; Bonding the transparent substrate to the transparent front protective plate using a transparent non-conductive optical adhesive; After the printing of the driving line is completed, a part of the pad is continuously printed; when printing the power line, in the case of adopting a parallel mode, the power line part of a row of pads is continuously printed.

2. The method for manufacturing an ultra-fine wire type LED transparent display screen according to claim 1, characterized in that: There are N soldering pads, driving lines, and LED devices; there are M power lines; one end of the N driving lines is connected to the N soldering pads one by one; the other ends of the N driving lines are connected to the flexible circuit board; an LED device is fixed on each soldering pad; the M power lines are used to supply power to the N LED devices.

3. The method for manufacturing an ultra-fine wire type LED transparent display screen according to claim 1, characterized in that: The transparent substrate is a flexible substrate.

4. A LED transparent display screen, using the method for manufacturing an ultra-fine wire type LED transparent display screen as claimed in claim 1, characterized in that: include: A transparent substrate (100), used to provide a carrier; A transparent pressure-sensitive adhesive layer, arranged on the upper surface of the transparent substrate (100); A soldering pad (200) is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, and an LED device (600) is fixed on the soldering pad (200); A driving line (310) is arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the solder pad (200) and the other end of which is used to connect to the flexible circuit board (400); A power line (320), arranged on the upper surface of the transparent pressure-sensitive adhesive layer, one end of which is connected to the solder pad (200) and the other end of which is connected to the flexible circuit board (400); A transparent front protection plate (500) is arranged on the LED device (600) and is bonded to the transparent substrate (100) via a transparent non-conductive optical adhesive.

5. The LED transparent display screen according to claim 4, characterized in that: There are N solder pads (200), driving lines (310), and LED devices (600); there are M power lines (320); one end of the N driving lines (310) is connected to the N solder pads (200) in a one-to-one correspondence; the other ends of the N driving lines (310) are connected to the flexible circuit board (400); one LED device (600) is fixed on each solder pad (200); and the M power lines (320) are used to supply power to the N LED devices (600).

6. The LED transparent display screen according to claim 5, characterized in that: The diameter of each driving wire (310) is 0.01 mm to 0.05 mm.

7. The LED transparent display screen according to claim 6, characterized in that: The diameter of each power line (320) is 0.05 mm to 0.2 mm; the total cross-sectional area of ​​the M power lines (320) is 2 / 3 to 1 of the total cross-sectional area of ​​the N drive lines (310).

8. The LED transparent display screen according to claim 7, characterized in that: There are a plurality of flexible circuit boards (400) distributed on both sides of the transparent substrate (100); the N driving lines (310) and the M power lines (320) are all connected to the flexible circuit board (400) closest to them.

9. The LED transparent display screen according to claim 4, characterized in that: The LED device (600) adopts RGB three-color LED.

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