How Xiaomi YU7’s optical technology reshapes the driving boundary

When the enveloping curved screen of Xiaomi YU7 lights up at the bottom of the windshield, the 1.1 meter long light band spreads like a Milky Way – this is not the imagination of science fiction movies, but the reality of China’s automobile industry putting the panoramic head up display (PHUD) technology into mass production for the first time. As the “latecomer” of smart electric vehicles, Xiaomi YU7 chooses to use Systematic innovation of optical technology As a breakthrough, from visual interaction to environmental perception, the underlying technology of human vehicle relationship has been reconstructed.

1、 Revolution of visual interaction: limitless light curtain replaces traditional screen

The traditional HUD has been criticized for its limited display area and ambient light interference. YU7’s “Skyscreen” has broken through with PHUD technology:

• Panoramic projection breaks through physical boundaries : The content source is provided through three Mini LED backlight LCD screens, and the black coating area at the bottom of the windshield is imaged through the projection system to form a 1.1 meter light band across the A pillar;
• Anti glare effect of nano optical coating : The nanometer optical coating process developed by Huayang Group has pressed the glass reflectivity to below 5%, combined with 1200 nits peak brightness and 903 zone light control, it is still clear and discernible in the hot sun;
• Dynamic visual optimization : Distortion correction algorithm and ALS ambient light sensing technology are used to realize adaptive adjustment of color temperature. The driver’s line of sight deviation angle is reduced by 15 degrees, and the response speed of key information is increased by 0.3 seconds.

Behind this “disappeared dashboard” is the 11.98 inch high penetration LCD module specially provided by TCL Huaxing. The light transmittance reaches 6.5% in 82% color gamut, and the power consumption of a single screen is only 15W—— Reconstruct space with light Instead of filling the space with the screen.

2、 Light environment management: cockpit aesthetics of dynamic dimming

The traditional sky curtain is faced with the contradiction between shading and daylighting. The electrochromic (EC) sky curtain of YU7 Max version gives a new explanation:

• Millisecond ray control : EC smart glass provided by Guangyi Technology can switch between high transparency and dark state instantaneously, achieving 99.85% shading rate, 99.99% UV insulation and 99.9% infrared insulation;
• Breakthrough in mass production of curved surface flexibility : Based on the flexible PET substrate and roll to roll process, it broke through the bottleneck of mass production of large-area curved dimming glass, with a monthly production capacity of more than 10000 sets.

When the sun is baking, the glass will darken automatically, and the cabin temperature will drop by 8 ℃; After entering the tunnel, the light becomes a programmable cockpit language.

3、 Awareness system upgrade: optical coating penetrates the environment fog

The reliability of pure visual perception in backlight, rain and fog scenes has been questioned. YU7 uses multiple optical technologies to strengthen the security line:

• ALD coated lens array : 7 5 megapixel ultra transparent anti glare cameras were covered with nano alumina coating, which pressed the ghost reflectivity from conventional 2.5% to 0.2%, and successfully identified 5cm screws 30 meters away from the tunnel backlight;
• 1550nm lidar rain and fog penetration : The standard lidar of the whole system adopts 1550nm fiber laser, the detection distance in rain and fog is 40% higher than that of the traditional 905nm equipment, and the farthest point cloud detection is 200m;
• All weather perception fusion : Laser radar point cloud, 4D millimeter wave radar space modeling and coating camera color capture constitute triple redundancy, and the recognition rate of obstacles in dark environment remains 98%.

4、 Optics and Human Factors: Disappearing Technology and Emerging Experience

The ultimate value of optical technology in YU7 is to hide technology behind experience:

• PHUD reduces line of sight switching through remote projection, and integrates navigation information into the road landscape;
• EC sky screen predicts the change of light according to GPS positioning, and adjusts the light transmittance insensibly;
• ALD coated lens can still capture the contour of obstacles 100 meters away in a rainstorm night, and the sense of security does not need to be deliberately reminded.

From the projection light curtain to the variable sky curtain, and then to the coating perception lens, the optical architecture of YU7 proves that: The ultimate form of an intelligent car is not the stacking of parameters, but the transformation of light into a breathable experience When the technology disappears in the user’s view, the real freedom of driving begins to emerge.