A flexible transparent LED display with a bending degree of not less than 85 degrees

Abstract

The present invention discloses a flexible transparent LED display with a bending degree of not less than 85 degrees, which relates to the field of LED displays, including a modified PET film layer, a plurality of first copper-plated layers distributed in a rectangular array are arranged on one side of the modified PET film layer, a low-temperature solder paste layer is welded on the outer side of the first copper-plated layer, an SMT lamp bead is fixedly connected to the outer side of the low-temperature solder paste layer, a protective layer is coated between two adjacent low-temperature solder paste layers, and a second copper-plated layer is arranged between two adjacent first copper-plated layers. The present invention provides a first copper-plated layer and a second copper-plated layer on the modified PET film layer, provides a plurality of tooth grooves on the conductive adhesive layer above the second copper-plated layer, and provides an arc groove on the outer side of the protective layer, so that the device can be bent to not less than 85 degrees, thereby improving the safety range of the device and making the device less prone to damage.

Description

Technical Field

[0001] The invention relates to the field of LED displays, and in particular to a flexible transparent LED display with a bending degree of not less than 85 degrees. Background Art

[0002] Traditional large display screens have strict requirements on installation conditions, because there may be non-planar installation surfaces whether in outdoor environments or indoor environments. In this case, the installation position needs to be changed, or a special mounting bracket needs to be designed to meet the installation requirements. However, both methods will bring additional costs such as manpower and materials, and the mounting bracket will also increase the overall weight of the display screen. In view of the fact that LCD displays are difficult to achieve seamless splicing and difficult to build flexible structures, flexible LED display screens have come into being. Existing flexible LED display screens are mainly composed of vertical LED light strips arranged in sequence and connected by cables. However, the bending angle of existing flexible LED display screens is limited and cannot be bent at a larger angle, so the scope of application is small. Therefore, it is necessary to invent a flexible transparent LED display with a bending degree of not less than 85 degrees to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a flexible transparent LED display with a bending degree of not less than 85 degrees, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a flexible transparent LED display with a bending degree of not less than 85 degrees, comprising a modified PET film layer, a plurality of first copper-plated layers distributed in a rectangular array are arranged on one side of the modified PET film layer, a low-temperature solder paste layer is welded to the outer side of the first copper-plated layer, an SMT lamp bead is fixedly connected to the outer side of the low-temperature solder paste layer, a protective layer is coated between two adjacent low-temperature solder paste layers, a second copper-plated layer is arranged between two adjacent first copper-plated layers, a conductive adhesive layer is coated on the outer side of the second copper-plated layer, the conductive adhesive layer is located on the inner side of the protective layer, a plurality of equally spaced tooth grooves are opened on the outer side of the conductive adhesive layer, the interior of the tooth groove is filled with an elastic adhesive layer, and an arc groove is opened in the middle of the outer side of the protective layer.

[0005] Preferably, the modified PET film layer comprises a PET base layer, one side of the PET base layer is coated with a pressure-sensitive adhesive layer, and the other side of the PET base layer is coated with a polyurethane film layer.

[0006] Preferably, an anti-scratch film layer is bonded and connected to the outer side of the polyurethane film layer, and a plurality of the anti-scratch film layers are provided, and the plurality of anti-scratch film layers are distributed in a rectangular array.

[0007] Preferably, the thickness of the first copper plating layer is 15-20 um, and the thickness of the second copper plating layer is 6-10 um.

[0008] Preferably, the tooth grooves on the conductive adhesive layer are arranged as an acute-angle structure, and the angle formed by the tooth grooves is 3-5 degrees.

[0009] Preferably, the pressure-sensitive adhesive layer is fluorinated ethyl acrylate, and the anti-scratch film layer is a PE anti-scratch film layer.

[0010] A preparation process of a flexible transparent LED display with a bending degree of not less than 85 degrees, comprising the following steps:

[0011] Step 1: firstly, the PET base layer is modified, that is, a pressure-sensitive adhesive layer is coated on one side of the PET base layer, and then a polyurethane film layer is coated on the other side of the PET base layer, and then an anti-scratch film layer is bonded on the outer side of the polyurethane film layer to obtain a modified PET film layer;

[0012] Step 2: copper-plating the modified PET film layer through a coating machine to obtain a first copper-plated layer and a second copper-plated layer, wherein the thickness of the first copper-plated layer is 15-20 um, and the thickness of the second copper-plated layer is 6-10 um, and then a conductive adhesive is coated on the outer side of the second copper-plated layer to form a conductive adhesive layer;

[0013] Step 3: Expose to yellow light in an exposure room, then use a high-speed laser etching device to etch circuits on the first copper plating layer and the second copper plating layer, and then solder the SMT lamp beads to the outside of the first copper plating layer through a reflow soldering process of a low-temperature solder paste layer;

[0014] Step 4: a plurality of small-angle grooves are formed on the outer side of the conductive adhesive layer, and elastic colloid is filled in the grooves to form an elastic adhesive layer;

[0015] Step 5: Form a protective layer on the outer PE film of the modified PET film layer to obtain a finished LED display, and finally perform online testing on the LED display.

[0016] Technical effects and advantages of the present invention:

[0017] 1. The present invention provides a first copper-plated layer and a second copper-plated layer on the modified PET film layer, provides a plurality of tooth grooves on the conductive adhesive layer above the second copper-plated layer, and provides an arc groove on the outer side of the protective layer, so that the device can be bent to not less than 85 degrees, thereby improving the safety range of the device and making the device less prone to damage;

[0018] 2. The present invention provides a polyurethane film layer in the modified PET film layer. The polyurethane film layer has high elasticity, so that the device will not be damaged when bent at not less than 85 degrees, thereby improving the safety of the device. At the same time, a pressure-sensitive adhesive layer is provided in the modified PET film layer. The pressure-sensitive adhesive layer has high temperature resistance and can prevent the low-temperature solder paste layer from damaging the modified PET film layer during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention.

[0020] Figure 2 It is a schematic cross-sectional view of the conductive adhesive layer structure of the present invention.

[0021] Figure 3 It is a schematic cross-sectional view of the modified PET film layer structure of the present invention.

[0022] In the figure: 1. Modified PET film layer; 2. First copper plating layer; 3. Low-temperature solder paste layer; 4. SMT lamp beads; 5. Protective layer; 6. Second copper plating layer; 7. Conductive adhesive layer; 8. Tooth groove; 9. Elastic adhesive layer; 10. Arc groove; 11. PET base layer; 12. Pressure-sensitive adhesive layer; 13. Polyurethane film layer; 14. Anti-scratch film layer DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0024] The present invention provides Figure 1-3 A flexible transparent LED display with a bending degree of not less than 85 degrees is shown. Figure 1 As shown, it includes a modified PET film layer 1, and a plurality of first copper-plated layers 2 distributed in a rectangular array are arranged on one side of the modified PET film layer 1. The thickness of the first copper-plated layer 2 is 15-20um. A low-temperature solder paste layer 3 is welded on the outer side of the first copper-plated layer 2. The outer side of the low-temperature solder paste layer 3 is fixedly connected with an SMT lamp bead 4. A protective layer 5 is coated between two adjacent low-temperature solder paste layers 3. The setting of the protective layer 5 plays a role of insulation protection.

[0025] Depend on Figure 2As shown, a second copper-plated layer 6 is arranged between two adjacent first copper-plated layers 2, the thickness of the second copper-plated layer 6 is 6-10um, the outer side of the second copper-plated layer 6 is coated with a conductive adhesive layer 7, the conductive adhesive layer 7 is located on the inner side of the protective layer 5, and a plurality of equally spaced tooth grooves 8 are provided on the outer side of the conductive adhesive layer 7, the tooth grooves 8 are arranged as an acute-angle structure, and the angle formed by the tooth grooves 8 is 3-5 degrees. The interior of the tooth grooves 8 is filled with an elastic adhesive layer 9, and the tooth grooves 8 cooperate with the elastic adhesive layer 9 so that the device can be bent to not less than 85 degrees, and an arc groove 10 is provided in the middle of the outer side of the protective layer 5, and the setting of the arc groove 10 enables the protective layer 5 to bend at a large angle without affecting the device.

[0026] Depend on Figure 3 As shown, the modified PET film layer 1 includes a PET base layer 11, one side of the PET base layer 11 is coated with a pressure-sensitive adhesive layer 12, the pressure-sensitive adhesive layer 12 is fluorinated ethyl acrylate, the pressure-sensitive adhesive layer 12 has high temperature resistance, and can prevent the low-temperature solder paste layer 3 from damaging the modified PET film layer 1 during welding, the other side of the PET base layer 11 is coated with a polyurethane film layer 13, the polyurethane film layer 13 has high elasticity, so that the device will not be damaged when bent at not less than 85 degrees, the outer side of the polyurethane film layer 13 is bonded with an anti-scratch film layer 14, a plurality of anti-scratch film layers 14 are provided, and the plurality of anti-scratch film layers 14 are distributed in a rectangular array, the anti-scratch film layer 14 is a PE anti-scratch film layer, the anti-scratch film layer 14 has the effect of wear resistance and scratch resistance, which improves the safety of the device, and the provision of the plurality of anti-scratch film layers 14 does not affect the large-angle bending of the device.

[0027] The present invention also discloses a preparation process of a flexible transparent LED display with a bending degree of not less than 85 degrees, comprising the following steps:

[0028] Step 1: firstly, the PET base layer 11 is modified, that is, a pressure-sensitive adhesive layer 12 is coated on one side of the PET base layer 11, and then a polyurethane film layer 13 is coated on the other side of the PET base layer 11, and then an anti-scratch film layer 14 is bonded to the outer side of the polyurethane film layer 13 to obtain a modified PET film layer 1;

[0029] Step 2: copper-plating the modified PET film layer 1 through a coating machine to obtain a first copper-plated layer 2 and a second copper-plated layer 6, wherein the thickness of the first copper-plated layer 2 is 15-20 um, and the thickness of the second copper-plated layer 6 is 6-10 um, and then a conductive adhesive is coated on the outer side of the second copper-plated layer 6 to form a conductive adhesive layer 7;

[0030] Step 3: perform yellow light exposure in an exposure room, then perform circuit etching on the first copper plating layer 2 and the second copper plating layer 6 by a high-speed laser etching device, and then solder the SMT lamp beads 4 to the outside of the first copper plating layer 2 by a reflow soldering process of a low-temperature solder paste layer 3;

[0031] Step 4: a plurality of small-angle grooves 8 are formed on the outer side of the conductive adhesive layer 7, and elastic colloid is filled in the grooves 8 to form an elastic adhesive layer 9;

[0032] Step 5: forming a protective layer 5 on the outer PE film of the modified PET film layer 1 to obtain a finished LED display, and finally performing online testing on the LED display.

[0033] The present invention provides a first copper-plated layer 2 and a second copper-plated layer 6 on a modified PET film layer 1, provides a plurality of tooth grooves 8 on a conductive adhesive layer 7 above the second copper-plated layer 6, and provides an arc groove 10 on the outer side of a protective layer 5, so that the device can be bent to not less than 85 degrees, thereby improving the safety range of the device and making the device less prone to damage. A polyurethane film layer 13 is provided in the modified PET film layer 1, and the polyurethane film layer 13 has a high elastic property, so that the device will not be damaged when bent not less than 85 degrees, thereby improving the safety of the device. At the same time, a pressure-sensitive adhesive layer 12 is provided in the modified PET film layer 1, and the pressure-sensitive adhesive layer 12 has a high temperature resistance property, so that the low-temperature solder paste layer 3 can be prevented from damaging the modified PET film layer 1 during welding.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible transparent LED display with a bending degree of not less than 85 degrees, comprising a modified PET film layer (1), characterized in that: A plurality of first copper-plated layers (2) distributed in a rectangular array are arranged on one side of the modified PET film layer (1); a low-temperature solder paste layer (3) is welded on the outer side of the first copper-plated layer (2); an SMT lamp bead (4) is fixedly connected to the outer side of the low-temperature solder paste layer (3); a protective layer (5) is coated between two adjacent low-temperature solder paste layers (3); a second copper-plated layer (6) is arranged between two adjacent first copper-plated layers (2); a conductive adhesive layer (7) is coated on the outer side of the second copper-plated layer (6); the conductive adhesive layer (7) is located on the inner side of the protective layer (5); a plurality of tooth grooves (8) distributed at equal intervals are opened on the outer side of the conductive adhesive layer (7); the inner side of the tooth grooves (8) is filled with an elastic adhesive layer (9); the protective layer ( 5) is provided with an arc groove (10) in the middle of the outer side; the modified PET film layer (1) comprises a PET base layer (11), one side of the PET base layer (11) is coated with a pressure-sensitive adhesive layer (12), and the other side of the PET base layer (11) is coated with a polyurethane film layer (13); the outer side of the polyurethane film layer (13) is bonded and connected with an anti-scratch film layer (14), and a plurality of anti-scratch film layers (14) are provided, and the plurality of anti-scratch film layers (14) are distributed in a rectangular array; the thickness of the first copper-plated layer (2) is 15-20 um, and the thickness of the second copper-plated layer (6) is 6-10 um; the tooth groove (8) on the conductive adhesive layer (7) is arranged as an acute angle structure, and the angle formed by the tooth groove (8) is 3-5 degrees.

2. The flexible transparent LED display with a bending degree of not less than 85 degrees according to claim 1, characterized in that: The pressure-sensitive adhesive layer (12) is fluorinated ethyl acrylate, and the anti-scratch film layer (14) is a PE anti-scratch film layer.

3. A process for preparing a flexible transparent LED display with a bending degree of not less than 85 degrees as claimed in claim 1, characterized in that: The following steps are involved: Step 1: firstly, a PET base layer (11) is modified, that is, a pressure-sensitive adhesive layer (12) is coated on one side of the PET base layer (11), and then a polyurethane film layer (13) is coated on the other side of the PET base layer (11), and then an anti-scratch film layer (14) is bonded to the outer side of the polyurethane film layer (13) to obtain a modified PET film layer (1); Step 2: copper-plating the modified PET film layer (1) by a coating machine to obtain a first copper-plated layer (2) and a second copper-plated layer (6), wherein the thickness of the first copper-plated layer (2) is 15-20 um, and the thickness of the second copper-plated layer (6) is 6-10 um, and then a conductive adhesive is coated on the outer side of the second copper-plated layer (6) to form a conductive adhesive layer (7); Step 3: performing yellow light exposure in an exposure room, then performing circuit etching on the first copper-plated layer (2) and the second copper-plated layer (6) using a high-speed laser etching device, and then soldering the SMT lamp beads (4) to the outer side of the first copper-plated layer (2) using a reflow soldering process of a low-temperature solder paste layer (3); Step 4: a plurality of small-angle grooves (8) are formed on the outer side of the conductive adhesive layer (7), and elastic colloid is filled in the grooves (8) to form an elastic adhesive layer (9); Step 5: coating the outer side of the modified PET film layer (1) with a PE film to form a protective layer (5), obtaining a finished LED display, and finally conducting online testing on the LED display.

Images