Fluorescent powder coating precipitation method applied to digital vehicle lamp

Abstract

The invention relates to the technical field of digital vehicle lamps, and discloses a fluorescent powder coating precipitation method applied to a digital vehicle lamp, and the method comprises the following steps: processing the surface of a substrate through plasma; a light-emitting area is controlled through a hard mask spraying method; no centrifugal precipitation fluorescent powder exists; and a specific fluorescent powder-glue ratio is adopted. By accurately controlling the deposition process and area of the fluorescent powder, the performance and production efficiency of the automobile lamp are remarkably improved, material waste and production process steps are reduced, and the cost is reduced. Therefore, reliable technical support is provided for efficient production of the digital vehicle lamp, and remarkable technical, economic and environmental benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of digital vehicle lights, and particularly to a phosphor coating and precipitation method applied to digital vehicle lights. This method is mainly applied to the preparation and coating precipitation technology of quantum dots or phosphor materials in vehicle light sources. Background Art

[0002] In modern vehicles, digital vehicle lights, as a form of intelligent vehicle lights, are gradually moving towards application. Especially in high-end vehicle models, Micro-LED technology has become one of the core light sources for digital vehicle lights due to its excellent brightness, color performance, and small size characteristics. By arranging tiny LED chips in an array, Micro-LED can provide higher resolution and more precise color control, which makes its application in digital vehicle lights have great potential.

[0003] However, the digital vehicle light system based on Micro-LED faces an important technical challenge: how to effectively use phosphor materials for efficient color conversion. Traditional phosphor coating methods mostly use techniques such as dispensing and electrophoretic deposition. Although these methods are effective in some application scenarios, when applied under Micro-LED technology, there are usually some significant problems. First, traditional methods are difficult to achieve precise control of the phosphor coating, resulting in blurred boundaries of the light-emitting area and uneven coating thickness, which in turn affects the color purity and pattern clarity of vehicle digital lights. Second, the coating adhesion is poor, and it is easy to fall off or deteriorate during long-term use or in high-temperature and high-humidity environments, resulting in a shortened lifespan of the vehicle lights. In addition, during the dispensing and electrophoretic deposition processes, it is easy to cause waste of phosphor, especially the large amount of solvents and other materials used in the preparation process, resulting in low efficiency. In order to meet the requirements of digital vehicle lights for high brightness, high stability, and high efficiency, there is an urgent need for a more efficient, precise, and environmentally friendly phosphor coating method. Summary of the Invention

[0004] The purpose of the present invention is to provide a phosphor coating and precipitation method applied to digital vehicle lights. By treating the substrate with plasma, controlling the light-emitting area by the hard mask spraying method, centrifuging and precipitating the phosphor without using it, and preparing the phosphor glue with a specific ratio, the actual requirements in the production of digital vehicle lights can be met.

[0005] Currently, traditional spraying methods are difficult to achieve precise control of the phosphor coating, resulting in blurred boundaries of the light-emitting area and uneven coating thickness, which in turn affects the optical performance and color consistency of vehicle lights. Second, the coating adhesion is poor, and it is easy to fall off or deteriorate during long-term use or in high-temperature and high-humidity environments, resulting in a shortened lifespan of the vehicle lights. In addition, the utilization rate of phosphor materials in traditional processes is low, the material waste is serious, and the high production cost is not conducive to large-scale production.

[0006] To achieve the above-mentioned invention objectives, the present invention overcomes the drawbacks of the prior art by innovatively introducing plasma treatment of the substrate, the hard mask spraying method to control the light-emitting area without centrifugal precipitation of phosphor, and the preparation of phosphor glue with a specific ratio. Plasma treatment can significantly improve the adhesion of the substrate surface, ensuring the bonding stability between the phosphor and the substrate; the hard mask spraying method can accurately define the light-emitting area, avoiding optical interference; the method of non-centrifugal precipitation of phosphor can volatilize a large amount of solvent during spraying and curing, preventing the coating from peeling or deteriorating in high-temperature and high-humidity environments; the specific glue ratio optimizes the optical performance, coating uniformity, production efficiency, and material utilization rate, enhancing the stability and durability of the coating, thereby improving the overall performance and lifespan of the digital vehicle lamp. Through the method of the present invention, not only can the uniformity and stability of the coating be improved, but also the production cost and environmental impact can be reduced, thus meeting the actual needs of digital vehicle lamps in industrial production.

[0007] The present invention uses plasma to treat the substrate to enhance the adhesion of the phosphor. The present invention ensures the uniformity of the light-emitting area through the hard mask spraying method, making the film thickness and color temperature stable. By controlling the spraying air pressure, the present invention can achieve a powder phosphor coating without centrifugation treatment, improving reliability, preventing the coating from peeling or deteriorating in high-temperature and high-humidity environments, precipitating the phosphor and isolating water and oxygen, and enhancing reliability.

[0008] By adjusting the ratio of the phosphor glue, the present invention optimizes the optical performance, coating uniformity, production efficiency, and material utilization rate, enhancing the stability, durability, and environmental resistance of the coating.

[0009] Specifically, the present application adopts the following technical solutions: The present application provides a phosphor coating and precipitation method applied to digital vehicle lamps, and the method includes the following steps: Step 101: Use a dispensing machine to uniformly make a dam (bank) with transparent thermosetting glue outside the pixel area of the Micro-LED chip. Control the height of the bank between 50 - 150 μm by setting the distance between the needle and the substrate and the size of the dispensing air pressure, and set the starting point position and the length of each side of the dam through programming; Step 102: Use a black adhesive (LOCTITE ECCOBOND FPAA51TD) to cover the exposed part of the CMOS substrate; Step 103: Use gases such as O2 and Ar to perform plasma treatment on the sample at this time to change the surface energy and enhance the adhesion of the phosphor to the substrate; Step 104: Mix the LED special phosphor (Opchem OPY5810A), heat curing agent, and diluent M-003 in a mass ratio of 1:2:1, or 1:1:2, or 1:2:3. Stir with a magnetic stirrer for 15 minutes and then pour into the spraying glue bucket. Among them, the heat curing agent includes one or more of optical encapsulation AB glue (Dow Corning OE-6550), PDMS (DC184), and methyl silicone resin (S26897). Step 105: Design the spraying mold to be 70 - 80 mm / s; drill holes on the iron fixture according to the chip size (the iron fixture after drilling is used as the shielding part). When in use, place the chip independently in the mold groove, place the mold face up on the stage, and fix it with screws. Step 106: Set the starting point position; adjust the spraying speed and the number of spraying passes, and adjust the spraying valve air pressure to 0.2 - 0.6 bar and the atomizing air pressure to 0.25 - 0.5 bar to uniformly produce the phosphor coating. Step 107: Cure the silica gel in the oven; use a constant temperature forced air drying oven to heat and cure the phosphor layer at a temperature of 100 °C for 30 minutes.

[0010] In summary, the present application has the following beneficial effects: By precisely controlling the deposition process and area of the phosphor, the present invention significantly improves the performance and production efficiency of vehicle lamps. First, this method improves the uniformity and stability of phosphor coating through the hard mask spraying method, making the coating thickness uniformity error controlled within 10 μm. Compared with the traditional spraying method, the coating uniformity is improved, and the color temperature is stably controlled between 5500 K - 6000 K. Second, the centrifugal precipitation-free phosphor method can volatilize a large amount of solvents during the spraying and curing processes, increasing reliability and preventing the coating from peeling or deteriorating in high-temperature and high-humidity environments. In addition, plasma treatment enhances the adhesion between the phosphor and the substrate. The specific glue ratio optimizes the optical performance, coating uniformity, production efficiency, and material utilization rate, enhancing the stability, durability, and environmental resistance of the coating, thereby improving the overall performance and lifespan of digital vehicle lamps. This method not only improves the phosphor utilization rate, reduces production costs, but also reduces the impact on the environment, meeting the actual needs of digital vehicle lamps in large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 : Schematic diagram of the phosphor coating precipitation method in the embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] The technical solutions and effects of the present application will be further described in detail below in conjunction with embodiments and the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the invention, rather than limiting the invention. In addition, it should be noted that for the convenience of description, only parts related to the invention are shown in the drawings, rather than all structures.

[0013] Embodiment 1 A phosphor coating precipitation method applied to digital vehicle lights, the method comprising the following steps: Step 101: Use a dispensing machine to evenly make a dam (bank) with transparent thermosetting glue on the outer circle of the Micro-LED chip pixel area. Control the height of the bank between 50-150 μm by setting the distance between the needle head and the substrate and the size of the glue outlet air pressure, and set the starting point position and the length of each side of the dam by programming; In this embodiment, taking a 5mm×15mm chip as an example, the height of the 4mm×14mm dam is 100 μm, and the height of the needle head from the chip surface is 110 μm at this time; Step 102: Use a black adhesive (LOCTITE ECCOBOND FPAA51TD) to cover the exposed part of the CMOS substrate; Step 103: Use gases such as O2 and Ar to perform plasma treatment on the sample at this time to change the surface energy and enhance the adhesion between the phosphor and the substrate; Step 104: Mix the LED special phosphor (Opchem OPY5810A), optical encapsulation AB glue (Dow Corning OE-6550) and diluent M-003 in a mass ratio of 1:2:1, stir with a magnetic stirrer for 15 min and then pour it into the spraying glue bucket; In other embodiments, the thermosetting agent may be selected from one or more of optical encapsulation AB glue (Dow Corning OE-6550), PDMS (DC184), and methyl silicone resin (S26897); Step 105: Design a spraying mold; dig holes in the iron fixture according to the chip size (the iron fixture after digging the holes is used as the shielding part), place the chip independently in the mold groove during use, place the mold face up on the stage, and fix it with screws; Step 106: Set the starting point position; adjust the spraying speed to 70 mm / s, spray 4 times repeatedly, adjust the spray valve air pressure to 0.2 bar, and the atomizing air pressure to 0.5 bar to evenly make a phosphor coating; Step 107: Cure the silica gel in an oven; use a constant temperature forced air drying oven to heat and cure the phosphor layer at a temperature of 100 °C for 30 minutes.

[0014] Performance testing: Use the Everfine Remote SPIC-30AW handheld spectral analyzer to test the color temperature of the complete sample at a fixed distance.

[0015] Test results: The color temperature is 5689K at 0.1A current, 5734K at 0.5A current, and 5746K at 1A current. It emits white light without blue light leakage.

[0016] Example 2 A phosphor coating precipitation method applied to digital vehicle lights, which is different from Example 1 in that: In step 104, the LED special phosphor (Opchem OPY5810A), optical encapsulation AB glue (Dow Corning OE-6550), and diluent M-003 are mixed in a mass ratio of 1:1:2.

[0017] In step 106, set the starting point position, adjust the spraying speed to 80mm / s, set the number of sprays to 4, adjust the spray valve air pressure to 0.2bar, and the atomization air pressure to 0.3bar to uniformly produce the phosphor coating.

[0018] Test results: The color temperature is 5734K at 0.1A current, 5809K at 0.5A current, and 5816K at 1A current.

[0019] Example 3 A phosphor coating precipitation method applied to digital vehicle lights, which is different from Example 1 in that: In step 104, the LED special phosphor (Opchem OPY5810A), optical encapsulation AB glue (Dow Corning OE-6550), and diluent M-003 are mixed in a mass ratio of 1:2:3.

[0020] In step 106, set the starting point position, adjust the spraying speed to 70mm / s, set the number of sprays to 4, adjust the spray valve air pressure to 0.6bar, and the atomization air pressure to 0.25bar to uniformly produce the phosphor coating.

[0021] Test results: The color temperature is 5739K at 0.1A current, 5734K at 0.5A current, and 5769K at 1A current.

[0022] In this article, specific examples are used to elaborate on the principles and implementation methods of the present invention. The descriptions of the above examples are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A phosphor coating precipitation method applied to digital vehicle lights, characterized in that, The method includes: treating the substrate by plasma, controlling the light-emitting area by hard mask spraying method, without centrifugal precipitation of phosphor, and preparing phosphor glue with a specific ratio.

2. The method according to claim 1, characterized in that The treatment of the substrate surface by plasma means: using plasma etching gas to perform plasma treatment on the sample at this time, changing the surface energy, and enhancing the adhesion between the phosphor and the substrate.

3. The method according to claim 1, wherein The control of the light-emitting area by hard mask spraying method means: designing a spraying mold, punching holes on the fixture according to the chip size to form a shielding part, and accurately aligning and covering the sample by hard mask spraying method.

4. The method according to claim 1, wherein The method of non-centrifugal precipitation of phosphor means: when controlling the spraying air pressure, a large amount of solvent volatilizes during the spraying and curing process, and a powdered phosphor coating can be achieved without centrifugation.

5. The method according to claim 1, wherein The method includes the following steps: Step 101: Uniformly fabricate a dam bank around the outer circle of the Micro-LED chip pixel area; Step 102: Cover the exposed part of the CMOS substrate with black adhesive; Step 103: Use plasma etching gas to perform plasma treatment on the sample at this time; Step 104: Mix the LED special phosphor, heat curing agent and diluent and pour them into the spraying glue bucket; Step 105: Design a spraying mold, punch holes on the fixture according to the chip size to form a shielding part, and accurately align and cover the sample by hard mask spraying method; Step 106: Spray to fabricate a phosphor coating; Step 107: Cure the silica gel in an oven.

6. The method according to claim 5, wherein In step 104, the LED special phosphor, heat curing agent and diluent are mixed according to a mass ratio of 1:2:1, or 1:1:2, or 1:2:

3.

7. The method according to claim 6, wherein The heat curing agent is selected from one or more of optical encapsulation AB glue, PDMS and methyl silicone resin.

8. The method according to claim 5, characterized in that, The specific steps of step 106 are: set the starting point position, adjust the spraying speed to 70 - 80 mm / s, set the number of spraying repetitions, adjust the spray valve air pressure to 0.2 - 0.6 bar, and the atomization air pressure to 0.25 - 0.5 bar, and uniformly fabricate a phosphor coating.

9. The method according to claim 5, characterized in that The specific steps of step 107 are: use a constant temperature air blast drying oven to heat and cure the phosphor layer, at a temperature of 100 °C for 30 minutes.

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