Damp-heat-resistant light-emitting structure
By introducing a water glue layer and shielding line into the moisture-resistant luminescent structure, the problems of medium leakage and electromagnetic interference in the humid and heat environment are solved, and the stability and waterproof performance of the structure are improved, ensuring that the phosphor layer is in the humid and heat environment. Continuous luminescence and anti-interference ability.
Patent Information
- Application Number
- CN202323602217.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2033-12-28
AI Technical Summary
The existing moisture-resistant luminescent structure is prone to dielectric leakage, silver paste penetration and boost breakdown problems in humid and heat environments, resulting in the phosphor layer not being bright and it is difficult to effectively prevent external electromagnetic interference.
Adopt a structure including a base layer, a conductive film, a phosphor layer, a dielectric layer, a silver paste layer and a water glue layer. The water glue layer is cured on the silver paste layer, a dielectric layer and a base layer, transmits current as a conductive layer and stimulates the phosphor through an electric field. Glow, while adding shielding lines and bends to reduce electromagnetic interference.
It improves the stability and waterproof performance of the luminescent structure, enhances the anti-humidity and anti-interference ability, ensures that the phosphor layer continues to emit light in a humid and heat environment and reduces external electromagnetic interference.
Smart Images
Figure CN222263066U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of light-emitting structures, and in particular to a moisture- and heat-resistant light-emitting structure. Background Art
[0002] Industrial control switches refer to switch devices used in industrial production processes, mainly used to control various equipment, machinery and processes. For industrial control switches used in certain environments, they need to overcome the hot and humid environment and also need to have a light-emitting structure to realize the light-emitting function.
[0003] The conventional moisture-heat-resistant luminescent structure uses a conductive film solidified on the base layer, then etches the conductive film, and then solidifies the phosphor, medium and silver paste in sequence. The medium plays an isolating role, and the electric field is used to make the phosphor emit light.
[0004] However, for the 160-170 hours of testing in a hot and humid environment, the phosphor was always lit, and in a hot and humid environment, holes were easily generated in the medium. Although the medium was printed several times, there were still holes on the medium, so the silver paste easily penetrated into the phosphor layer, causing the phosphor layer to not light up. In addition, the process also generated a voltage increase of tens of volts, which further broke down the medium layer. Utility Model Content
[0005] In order to improve the structural stability of the moisture-heat-resistant luminescent structure, the present application provides a moisture-heat-resistant luminescent structure.
[0006] The present application provides a moisture-resistant and heat-resistant luminous structure, which adopts the following technical solution:
[0007] A moisture-heat-resistant luminescent structure comprises a base layer, a conductive film is solidified on one side of the base layer, a fluorescent powder layer is solidified on the side of the conductive film away from the base layer, a dielectric layer is solidified on the side of the fluorescent powder layer away from the base layer, a silver paste layer is solidified on the side of the dielectric layer away from the fluorescent powder layer, and the dielectric layer is used to isolate the fluorescent powder layer and the silver paste layer; a hydrogel layer is provided on the side of the silver paste layer away from the dielectric layer, and the hydrogel layer is solidified on the silver paste layer, the dielectric layer and the base layer.
[0008] By adopting the above technical solution, the silver paste layer will be used as a conductive layer to transmit current. Through the action of the electric field, the silver ions in the conductive layer will move, thereby forming a current between the conductive layer and the phosphor, and the current will excite the phosphor to emit light. The luminous intensity and color of the phosphor can be controlled by adjusting the electric field strength or voltage. By adding a hydrogel layer, while improving the bonding strength, it also plays a role in waterproof isolation, which can further protect the stability of the light-emitting structure.
[0009] Optionally, the water adhesive layer includes a TB1549B silk screen adhesive layer.
[0010] By adopting the above technical solution, TB1549B screen printing adhesive is a water-based pressure-sensitive water adhesive, which is suitable for screen printing process. It can fix and bond electronic panels, nameplates, LOGOs, etc. It has good initial bonding strength and can be cured at room temperature.
[0011] Optionally, the area of the dielectric layer is larger than the area of the phosphor layer, and the area of the dielectric layer is larger than the area of the silver paste layer.
[0012] By adopting the above technical solution, the dielectric layer has a larger area and the isolation effect can be improved.
[0013] Optionally, a first electrode line and a second electrode line are cured on the base layer, the first electrode line is electrically connected to the silver paste layer; and the second electrode line is electrically connected to the conductive film.
[0014] By adopting the above technical solution, the conduction of the silver paste layer and the conductive film is achieved through the first electrode line and the second electrode line.
[0015] Optionally, a shielding wire is solidified on the base layer, and the shielding wire is arranged around the phosphor layer, with one end of the shielding wire being grounded and the other end being suspended.
[0016] By adopting the above technical solution, the shielding line is helpful to reduce external electromagnetic interference, so as to improve the stability of the light emission of the fluorescent layer.
[0017] Optionally, a bending portion is provided on the shielding wire.
[0018] By adopting the above technical solution, the bending part can better absorb and reflect electromagnetic waves by changing the shape of the shielding wire, thereby improving the shielding effect; it can also help to shield the signal on the external circuit board that is fitted, which is beneficial to further suppress external electromagnetic interference, improve anti-interference ability, and ensure the stability of luminescence.
[0019] Optionally, arc chamfers are provided at corners of the silver paste layer, the shielding wire, the first electrode wire and the second electrode wire.
[0020] By adopting the above technical solution, the arc chamfer is conducive to improving the electric field distribution, making it less likely for the electric field to concentrate at the corners, thereby making it less likely for local discharge or breakdown to occur, reducing the electric field strength and improving the insulation performance of the structure.
[0021] Optionally, the base layer comprises a PET layer.
[0022] By adopting the above technical solution, the PET layer plays a better supporting role and is not easy to affect the luminescence of the phosphor.
[0023] Optionally, the dielectric layer includes an insulating layer.
[0024] By adopting the above technical solution, the insulating material of the insulating layer mainly functions to prevent current from flowing directly between the silver paste layer and the fluorescent layer, while ensuring the physical and chemical stability between the two layers.
[0025] In summary, the present application includes at least one of the following beneficial technical effects: a hydrogel layer is added to achieve better waterproof performance and moisture and heat resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 It is a schematic diagram of the overall structure of a moisture-heat-resistant luminescent structure according to an embodiment of the present application.
[0027] Figure 2 This is a schematic diagram of the structure of a moisture-heat-resistant luminous structure used for the back side of an embodiment of the present application.
[0028] Figure 3 It is a cross-sectional view of a moisture-heat-resistant luminescent structure according to an embodiment of the present application.
[0029] Figure 4 It is a schematic diagram of a shielding wire in a moisture-heat-resistant luminous structure according to an embodiment of the present application.
[0030] Figure numerals: 1, base layer; 2, conductive film; 3, phosphor layer; 4, dielectric layer; 5, silver paste layer; 6, hydrogel layer; 7, shielding line; 8, first electrode line; 9, second electrode line; 10, bending part. DETAILED DESCRIPTION
[0031] The present application is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0032] The embodiment of the present application discloses a moisture-heat-resistant luminous structure.
[0033] Reference Figure 1 and Figure 2 A moisture-heat resistant luminescent structure includes a base layer 1, on which a conductive film 2, a phosphor layer 3, a dielectric layer 4, a silver paste layer 5 and a hydrogel layer 6 are sequentially cured. The dielectric layer 4 covers the phosphor layer 3 and is used to isolate the phosphor layer 3 from the silver paste layer 5. The hydrogel layer 6 is cured on the silver paste layer 5, the dielectric layer 4 and the base layer 1, and has a waterproof effect, thereby improving the moisture-heat resistant effect of the luminescent structure.
[0034] Reference Figure 1 and Figure 3The base layer 1 is set as a PET layer. The PET layer can be a square or round sheet structure. The PET layer plays a good supporting role and is not easy to affect the luminescence of the phosphor. In addition, the advantages of PET material are that it has good mechanical properties and is resistant to bending; it has excellent high and low temperature resistance. PET can be used for a long time within the temperature range of 120°C, and can withstand high temperatures of 150°C for short-term use. It can also withstand low temperatures of -70°C, and its mechanical properties are little affected by high and low temperatures. At the same time, it also has excellent gas, water, oil and odor resistance.
[0035] The conductive film 2 is made of ITO film or conductive glue, and the formation of the conductive film 2 needs to be achieved by etching or other methods. Among them, the ITO film is one of the most commonly used transparent conductive films for making transparent electrodes, filters, anti-reflection films, infrared windows and solar cells. It has excellent insulation, oxidation resistance, corrosion resistance and conductivity, and has high light transmittance and excellent weather resistance, and can maintain stable performance under various environmental conditions. Conductive glue is a material that connects electronic devices to circuits, and has conductivity and adhesion. Conductive glue can replace traditional welding processes to achieve lead-free and harmless connections, and can be cured at room temperature, which is convenient for automated production. In addition, conductive glue can also be used to manufacture electromagnetic shielding covers, conductive circuits, conductive zebra crossings, etc.
[0036] The phosphor is uniformly cured on the cured conductive film 2 to form a phosphor layer 3. The curing method can be carried out by coating or spraying, generally by screen printing. The electrical principle of the conductive electric field of the silver paste layer 5 that causes the phosphor layer 3 to emit light is mainly because the silver particles in the silver paste layer 5 have excellent conductive properties. When current passes through the silver paste layer 5, the silver particles, as conductors, will generate an electric field. Under the action of this electric field, the electrons on the surface of the silver particles will be excited to a higher energy level. When these electrons fall back to a low energy level, energy will be released. Since the substances in the phosphor layer 3 have the characteristics of absorbing this energy, this energy will be converted into photons and released, thereby generating visible light.
[0037] The dielectric layer 4 includes an insulating layer, which can be obtained by multiple printings. The area of the dielectric layer 4 is larger than the area of the phosphor layer 3, and the area of the dielectric layer 4 is larger than the area of the silver paste layer 5. The larger area of the dielectric layer 4 can improve the isolation effect. Among them, the insulating material of the insulating layer mainly prevents the current from flowing directly between the silver paste layer 5 and the fluorescent layer, while ensuring the physical and chemical stability between the two layers. Common insulating materials include polymer materials such as polyimide (PI), polyester (PET), polycarbonate (PC), and inorganic materials such as ceramics and glass. The specific type of insulating material selected depends on the specific application environment and performance requirements of the industrial switch. The insulating material used needs to have good moisture and heat resistance and be able to maintain stable electrical and mechanical properties under high temperature and high humidity environments. At the same time, it also needs to have good compatibility with the silver paste layer 5 and the fluorescent layer to ensure that no delamination or shedding occurs during manufacturing and use.
[0038] The silver paste layer 5 will serve as a conductive layer for transmitting current. Through the action of the electric field, the silver ions in the conductive layer will move, thereby forming a current between the conductive layer and the phosphor, and the current will excite the phosphor to emit light. The luminous intensity and color of the phosphor can be controlled by adjusting the electric field strength or voltage. Among them, the silver paste is a slurry for making silver electrodes. It is prepared from silver or its compound, flux, adhesive and diluent.
[0039] By adding the hydrogel layer 6, the bonding strength is improved and the waterproof isolation is also provided, which can further protect the stability of the light-emitting structure. The hydrogel layer 6 adopts the TB1549B screen printing adhesive layer of Japan ThreeBond. The TB1549B screen printing adhesive is a water-based pressure-sensitive hydrogel suitable for screen printing process, which can fix and bond electronic panels, nameplates, LOGOs, etc. In addition, the TB1549B screen printing adhesive layer has good initial bonding strength and can be cured at room temperature.
[0040] The first electrode wire 8 and the second electrode wire 9 are cured on the base layer 1, and the first electrode wire 8 is electrically connected to the silver paste layer 5; the second electrode wire 9 is electrically connected to the conductive film 2. The first electrode wire 8 and the second electrode wire 9 realize the conduction of the silver paste layer 5 and the conductive film 2. The hydrogel layer 6 also covers the ends of the first electrode wire 8 and the second electrode wire 9 close to the silver paste layer 5 and the conductive film 2.
[0041] Reference Figure 1 and Figure 4, a shielding wire 7 is solidified on the base layer 1, and the shielding wire 7 is arranged around the phosphor layer 3, and one end of the shielding wire 7 is electrically connected to the ground wire, and the other end is suspended. The sides of the shielding wire 7 away from the phosphor layer 3 where the ground wire is located are all covered under the dielectric layer 4. The shielding wire 7 is beneficial to reduce external electromagnetic interference to improve the stability of the luminescence of the phosphor layer. One end of the shielding wire 7 is grounded, and the other end is not grounded, which is called single-ended grounding; in the case of single-ended grounding, one end of the shielding wire 7 is connected to the ground wire of the device, and the other end is suspended. When an interference signal enters the shielding wire 7, it will be short-circuited at the grounding point, thereby eliminating the influence of the interference.
[0042] In order to further suppress external electromagnetic interference, improve anti-interference ability, and ensure the stability of light emission, a bending portion 10 is provided on the shielding wire 7. The bending portion 10 can better absorb and reflect electromagnetic waves by changing the shape of the shielding wire 7, thereby improving the shielding effect. It can also help shield the signal on the external circuit board that is fitted, which is beneficial to further suppress external electromagnetic interference, improve anti-interference ability, and ensure the stability of light emission.
[0043] In addition, in order to improve the electric field distribution, arc chamfers are provided at the corners of the silver paste layer 5, the shielding wire 7, the first electrode wire 8 and the second electrode wire 9. The arc chamfers are conducive to making it difficult for the electric field to concentrate at the corners, thereby making it difficult for local discharge or breakdown to occur, reducing the electric field strength and improving the insulation performance of the structure.
[0044] The implementation principle of a moisture-heat-resistant luminescent structure in an embodiment of the present application is as follows: in the manufacturing process, the coated conductive film 2 is heated or irradiated with ultraviolet rays to solidify it on the PET film; then the phosphor is evenly coated on the solidified conductive film 2, which can be done by coating or spraying. Next, the dielectric layer 4 is coated and solidified on the phosphor layer 3; then, the silver paste layer 5 is solidified onto the dielectric layer 4, and finally, the hydrogel is coated on the above-mentioned layer structure to form a hydrogel layer 6. The electric field formed by the conductive film and the silver paste layer causes the silver ions in the conductive layer to move, thereby forming a current between the conductive layer and the phosphor. The current excites the phosphor to emit light. The luminous intensity and color of the phosphor can be controlled by adjusting the electric field strength or voltage.
[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A moisture-resistant and heat-resistant luminous structure, characterized in that: The invention comprises a base layer (1), a conductive film (2) is solidified on one side of the base layer (1), a fluorescent powder layer (3) is solidified on the side of the conductive film (2) away from the base layer (1), a dielectric layer (4) is solidified on the side of the fluorescent powder layer (3) away from the base layer (1), a silver paste layer (5) is solidified on the side of the dielectric layer (4) away from the fluorescent powder layer (3), and the dielectric layer (4) is used to isolate the fluorescent powder layer (3) and the silver paste layer (5); a hydrogel layer (6) is provided on the side of the silver paste layer (5) away from the dielectric layer (4), and the hydrogel layer (6) is solidified on the silver paste layer (5), the dielectric layer (4) and the base layer (1).
2. The moisture-heat-resistant luminescent structure according to claim 1, characterized in that: The water glue layer (6) comprises a TB1549B silk screen glue layer.
3. The moisture-heat-resistant luminescent structure according to claim 1, characterized in that: The area of the dielectric layer (4) is larger than the area of the phosphor layer (3), and the area of the dielectric layer (4) is larger than the area of the silver paste layer (5).
4. The moisture-heat-resistant luminescent structure according to claim 1, characterized in that: A first electrode line (8) and a second electrode line (9) are cured on the base layer (1), wherein the first electrode line (8) is electrically connected to the silver paste layer (5); and the second electrode line (9) is electrically connected to the conductive film (2).
5. The moisture-heat-resistant luminescent structure according to claim 4, characterized in that: A shielding wire (7) is solidified on the base layer (1), and the shielding wire (7) is arranged around the circumference of the phosphor layer (3), with one end being grounded and the other end being suspended.
6. The moisture-heat-resistant luminescent structure according to claim 5, characterized in that: The shielding wire (7) is provided with a bending portion (10).
7. The moisture-heat-resistant luminescent structure according to claim 1, characterized in that: The base layer (1) comprises a PET layer.
8. The moisture-heat-resistant luminescent structure according to claim 1, characterized in that: The dielectric layer (4) comprises an insulating layer.
9. The moisture-heat-resistant luminescent structure according to claim 5, characterized in that: Arc chamfers are provided at the corners of the silver paste layer (5), the shielding wire (7), the first electrode wire (8) and the second electrode wire (9).