# High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress
## 3 Research Progress of High-Resolution Headlamps
### Existing Measures to Deal with System Stability of High-Resolution Headlamps  
[PERSON] et al. designed an adaptive driving beam that, in addition to common anti-dazzle functions, uses LED lights with adjustable color temperature to better alert the driver in bad weather conditions [58]. The developed ADB (6000 k\(\sim\)3000 k) illuminates the target object, and the visibility of the ADB is analyzed with the CL-500A luminometer. The size of the LED chip is \(1.1\times 1.1\) mm\({}^{2}\), with 1400 lm under 1.5 A, and any one of them can meet the ECE R112 standard; the size of the PKG is 0.1 mm. The light emitted by the eight LEDs in the series array is collected through the first optical guiding lens, and then the light beam is secondarily distributed through the free-form surface lens and is transmitted to the second projection lens. The ADB spot covers \(\pm 2.5^{\circ}\) vertically and \(\pm 10^{\circ}\) horizontally. Using the simulator and the 16-channel LDM to control each LED, one can control 256 levels of dimming. Regarding LED array and light, humidity, rain sensors, etc., various sensors are synchronized, the weather conditions are analyzed through the sensor system, and the color temperature of each LED in the lamp is controlled in real time. The comparison test verifies that the average brightness of the 6000 k light source on the high-brightness reflectance sheet is higher than that of the 3000 k light source during normal road driving. Specifically, it is 26.7% higher. When driving on rainy roads, the average brightness of the 3000 k light source is 11.25% higher than that of the 6000 k light source. In snowfall, the visibility of the 6000 k light source is 12% higher than that of the 2000 k light source. It is confirmed that the system can provide safety impact.  
[PERSON] et al. proposed a lighting system composed of an LED array and a lens array [59]. According to the principle of integral imaging, the mapping relationship between the source and the target was established. According to the mapping relationship, the shape of the light type can be adjusted freely, and a 32 \(\times\) 32 LED matrix was designed. The use of matrix lighting can achieve real time control of light beam and shape. The combination of LED array and lens array is also one of the more popular research directions. [PERSON] explained that the small lens array based on the Kohler illumination principle can effectively homogenize the light and shape it into a rectangle at the same time [60].  
By comparing the existing mainstream pixelated architectures--LCD beam, DMD, laser scanning, and pixelated LEDs, as shown in Figure 9--[PERSON] argues that pixelated LEDs have higher efficiency and longer service lives and help to reduce CO2. The emission is in line with the current concept of green environmental protection [61].  
[PERSON] designed a matrix headlight based on artificial intelligence control [62]. The microprocessor processes the data received by the data acquisition module and controls the corresponding LED matrix control module, which is arranged in a matrix in the internal space of the car headlamps. There are four lighting lamps, and the infrared sensors are installed at the bottom these; the controller is connected with the mobile intelligent terminal through the communication board, and the connection with the control panel and the time unit is realized. The experimental results show that, compared with traditional car headlamps, the energy consumption of matrix headlamps is reduced by 16%, effectively reducing the energy consumption of car lights.