# High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress
## 2 Functional Requirement Analysis
### Stability of High-Resolution Headlamps  
High-resolution headlamps require real-time feedback on the information collected by the car. At the same time, the complexity of the traffic road requires the system to be capable of real-time correction and self-checking. [PERSON] proposed that the use of high beam lighting in severe weather such as rain and fog increases the glare more significantly [16]. Therefore, special lighting strategies are required under severe weather conditions. The development of adaptive headlamps can solve this problem, especially on wet and rainy roads, when the forward reflection of wet roads can directly look at oncoming vehicles, and the high-resolution headlight adaptive area can extend from the high-light area to the near field, depending on the width of the passage and the surrounding area of oncoming vehicles. In the tolerable shading area, the vertical opening angle of the light source module requires different high-definition resolution. [PERSON] et al. investigated the behavior of vehicles at night under wet or dry road conditions [1]. The Audi Driving Experience Center in Germany used two interoperable test tracks to test the impact of directly reflected light on drivers in wet weather. By rating the low beam, the high beam, and the digital light separately, it was observed that, under humid conditions, due to the influence of reflected light, the low beam and the digital light are satisfactory in the glare level, while the high beam is clearly dazzling. All experiments and test results show that digital light can improve the lighting environment in critical and extreme weather to a satisfactory extent, and digital light does not produce additional glare. In the research on the use of matrix headlamps in fog by [PERSON] et al., it was found that the increase in the luminous intensity below the cut-off line of matrix headlamps can improve visibility in foggy conditions [17]. They suggested that high-resolution headlight systems can be used to achieve higher visibility. [PERSON] et al. pointed out that, under bad weather conditions, reduced visibility and dazzling caused by rain and snow lead to wrong judgments and cause traffic accidents [18]. The light distribution must be adjusted according to general visibility and the visibility of the light source. Based on the visibility measurement of the target and the subjective scores of the participants, the potential of high-resolution headlamps to improve visibility in fog was confirmed. [PERSON] et al. pointed out that ADB can illuminate the area where the low beam fails to reach the light and improve the safety of autonomous driving [19]. [PERSON] et al. elaborated on the importance of high-resolution headlamps for autonomous driving [20]. At night, sensors must be able to detect rain, fog, snow, and street conditions such as wet and frozen roads. Headlamps can support camera detection of objects at night. Providing better night lighting for autonomous driving is one of the most important tasks of new technology digital light technology. This means that light distribution and intensity of the high-resolution LED pixel headlamp system will be precisely controlled according to the needs of the vision sensor. Therefore, high overall stability is necessary, high-resolution headlamps are an important part of lighting, and self-repair is inevitable. [PERSON] et al. proposed a \"self-healing\" measure for matrix headlamps [21]. The highly adaptive headlamps compensate for the failure of one or more adjacent LEDs by controlling other LEDs. Studies have shown that, even if there are one to two LEDs that are malfunctioning, the unevenness caused by local dimming can be improved through reasonable light distribution and \"self-healing\" measures. Severe weather is one of the main factors of traffic accidents. High-resolution LED pixel headlamps can adjust the light distribution in real time according to general visibility and the visibility of the ambient light to reduce the occurrence of traffic accidents.