Multiple Challenges of LED Automotive Lighting Application Requirements and Reliability

LED automotive lighting market in recent years has been the rapid development of LED devices in line with the automotive lighting standard system at the same time, but also faces multiple challenges in terms of cost and reliability.

First, LED automotive lighting standard system

1.International automotive lighting standard system

International automotive lighting standards system including the Economic Commission for Europe standards (ECE), the American Society of Motor Vehicle Engineers standards (SAE), Japanese Industrial Standards (JIS), vehicle electronic components testing standards (AEC-Q).

2. China's automotive lamps and lanterns standard system

The current domestic automotive lamps and lanterns standard equivalent for the ECE standard. China has promulgated standards related to automotive lamps and lanterns are.

3. Requirements of relevant regulations on the design of vehicle lights

Second, LED automotive lighting applications in the field of the challenges faced

1.Cost

At present, China's total sales of cars, compact, small, micro-car sales accounted for 77%, compact and small SUV is 76% of SUV. This part of the model is very sensitive to the cost, the current ordinary halogen headlights and low-cost LED headlights is still more than 300 yuan difference, so LED automotive lighting, especially in the popularity of headlights, but also need to reduce the cost of the system in order to promote.

2.Efficiency

LED vehicle level luminous efficiency is significantly lower than the civilian level, due to space constraints and ground illumination requirements, automotive LED (especially lighting class) arrangement often has a high power, compact layout must be configured with active cooling system to improve energy consumption.

3. Optical performance

The application of LED makes the optical design of automotive lamps and lanterns in a more diversified form, while providing a higher colour temperature, wider and more uniform lighting effect.

However, LED automotive lighting, especially signal lights and ambient light on the light colour uniformity has high requirements, the current downstream automotive lighting manufacturers to ensure the uniformity of the light colour are generally used to control the supply of LED BIN, the selected BIN the less the consistency of the light colour is the better, at the same time, the more expensive; on the other hand, the use of automotive lamps and lanterns of the environment (such as the engine compartment) has a large temperature difference, good colour stability is very important. On the other hand, the environment in which the automotive lamps are used (e.g. engine compartment) has great temperature difference, so good colour stability is very important.

4.Reliability

LED automotive lighting fixtures and general-purpose lighting fixtures there are large gaps, mainly in the input voltage fluctuations, the use of vibration intensity and frequency of change and the engine compartment and other changes in the surrounding heat, temperature and humidity alternation, solar radiation, salt spray corrosion, dust fall and many other factors, so LED automotive lighting for the reliability of the device and the lamps and lanterns than the field of general-purpose lighting to be much higher requirements.