No.1 Technological Evolution of Automotive Lighting Applications
Traditional automotive lighting systems mainly served the functions of illumination and signal warning, with core requirements focused on luminous intensity, irradiation distance, and visibility. With the rapid development of automotive styling design and intelligent cockpit technologies, the role of lighting systems has undergone a significant transformation. Automotive lighting is no longer limited to a functional component, but has gradually evolved into an integrated carrier of vehicle design language, brand identity, cockpit ambience, and human-machine interaction.
Judging from the current design trends of mainstream automakers, lighting systems are being endowed with stronger styling and interactive attributes. For example, the Audi Q6 e-tron is equipped with second-generation digital OLED tail lamps, enabling more dynamic lighting effects through refined light-emitting segments. The new Mercedes-Benz CLA adopts an illuminated star-pattern grille, integrating 142 independently illuminated star elements to combine brand identity, front-end styling, and lighting effects into one unified design.
The technological upgrade of lighting applications has placed higher requirements on the surface treatment processes of related components. For illuminated emblems, full-width tail lamps, ambient lighting decorative parts, and similar products, surface treatment is no longer limited to the realization of color or texture. Instead, it must further coordinate with vehicle styling, optical performance, and long-term reliability. The more refined the lighting effect becomes, the higher the requirements for coating precision and film control.
No.2 Core Challenges Imposed on Vacuum Coating Processes by Automotive Lighting Upgrades
1. Coordinated Control of Decorative Effect, Light Transmission, and Film Functionality
In applications such as illuminated emblems, ambient lighting decorative parts, and full-width tail lamps, components are required to meet both decorative and optical performance requirements. In the non-illuminated state, they need to present a metallic texture, dark appearance, or integrated styling effect. In the illuminated state, they must allow light to transmit uniformly according to the design requirements.
Depending on the functional requirements of different products, common coating structures include semi-transparent coatings, NCVM coatings, metallized coatings, and protective coatings. Semi-transparent coatings are mainly used to regulate light transmittance and reflectance. NCVM coatings can create a metallic appearance on plastic substrates while reducing the impact of continuous electrical conductivity. Metallized coatings can improve reflection, shielding, and decorative effects. Protective coatings are used to enhance wear resistance, weather resistance, and long-term coating stability.
Although these effects may appear to be part of exterior design, they actually impose high requirements on film thickness control and coating process stability. If the film is too thick, light transmittance will be reduced, making it difficult for the light source to transmit effectively and resulting in insufficient brightness or even failure to achieve the expected light-transmitting effect. If the film is too thin, the decorative texture will be weak. If the film thickness is uneven, problems such as inconsistent brightness, obvious color difference, local mottling, and unstable appearance may occur.
Therefore, vacuum coating for automotive lighting components requires not only the correct selection of coating types, but also stable control of transmittance, reflectance, color consistency, and film thickness uniformity. For high-end automotive lighting components, these details directly affect the overall exterior quality of the vehicle.
2. Complex Geometries Increase the Difficulty of Film Thickness Uniformity Control
Illuminated emblems, full-width tail lamps, ambient lighting decorative parts, and similar products often feature curved surfaces, arcs, corners, or irregular shapes, rather than simple flat geometries. Compared with flat substrates, these complex structures are more easily affected by fixture design, tooling configuration, part placement angle, and deposition direction during the coating process, resulting in differences in coating coverage across different areas.
Once film thickness distribution becomes uneven, the product may suffer from inconsistent brightness, obvious color variation, local mottling, unstable edge effects, and other appearance defects.
3. Higher Requirements for Batch Consistency and Long-Term Reliability
The evaluation of vacuum coating processes for automotive lighting components cannot rely solely on sample-stage performance. Greater attention must be paid to stability during mass production. The successful realization of a metallic texture, dark appearance, or semi-transparent effect in small-batch samples does not necessarily mean the process is mature. Once the product enters mass production, color consistency, light transmission consistency, coating adhesion, and appearance stability must still be maintained across different batches.
Exterior lighting components and illuminated emblems are exposed over the long term to thermal cycling, ultraviolet radiation, hot and humid environments, car wash chemicals, dust adhesion, and minor scratching. Although interior ambient lighting decorative parts operate in a relatively mild environment, they must also maintain long-term appearance stability and avoid discoloration, coating delamination, mottling, or texture degradation.
Therefore, the evaluation of a coating process should not only focus on whether the expected appearance can be achieved, but also on whether the process can support stable mass production and pass reliability validation. This is also a key basis for determining whether the process can be formally introduced into the automotive supply chain.
No.3 Zhenhua Vacuum’s Automotive Lighting Coating Solution
In response to the requirements of automotive lighting components for light transmission, reflection, decorative appearance, and long-term stability, Zhenhua Vacuum has developed the ZCL1417 coating equipment specially designed for the automotive industry. This equipment can be applied to automotive lamp reflectors, interior ambient lighting parts, illuminated emblems, radar emblems, interior decorative components, and other products.
The equipment integrates multiple coating technologies, including DC sputtering, MF sputtering, CVD, and resistance evaporation. It can be configured according to different process requirements and supports flexible process switching for complex customer products. It is suitable for the preparation of various coating structures, including metallic films, reactive films, and semi-transparent films.
For illuminated emblems, ambient lighting decorative parts, lamp reflectors, and related products, the equipment can realize continuous preparation of decorative coatings and protective coatings. This helps reduce the risk of contamination caused by secondary processing, while improving film thickness uniformity, appearance consistency, and mass production stability.
No.4 Conclusion
As automotive lighting systems continue to evolve from basic illumination functions toward styling expression, brand recognition, and intelligent interaction, the requirements for surface treatment processes are also increasing. For illuminated emblems, full-width tail lamps, ambient lighting decorative parts, and similar products, the coating process not only determines exterior texture, but also directly affects light transmission performance, coating consistency, mass production stability, and long-term reliability.
In the future, the upgrade of automotive lighting components will increasingly rely on high-precision, multifunctional, and mass-producible vacuum coating processes. Zhenhua Vacuum will continue to focus on the comprehensive needs of the automotive industry for optical effects, decorative textures, and reliability validation, providing more stable and efficient vacuum coating equipment and process solutions to support the high-quality upgrade of automotive lighting, interior, and exterior decorative components.
-This article was published by vacuum coating equipment manufacturer Zhenhua Vacuum
Post time: Jul-09-2026