When the vehicle is driving at high speed, especially during high-speed driving at night, the driver may look down at the meter display or watch the sound of the center console. At this time, if there is an emergency in front, there may be an accident due to the lack of effective measures. . In order to avoid this, some high-end vehicles are equipped with a head-up display (HUD) system, which can display relevant information on the driver's head-up range of the front windshield, and the display position and display brightness are adjustable, so as to avoid bowing. Look at the meter, thus shortening the visual blind zone time of the eyeball to the front. It is of great value to reduce traffic accidents caused by bowing.
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HUD is the abbreviation of English HeadUpDisplay, which means to display the head up, or you can call it a head-up display. Like many of the technologies developed by the war, the original application of HUD was on the fighter plane. The first aircraft equipped with HUD was the French Mirage fighter. The integrated electronic display device consisting of electronic components, display components, controllers, and high-voltage power supplies can project flight parameters, aiming attacks, self-tests, and the like in the form of images and characters through the optical components to the front of the cockpit. On a combination glass or helmet display device.
HUD first appeared in cars in the late 1980s. The characteristics of HUD were favored by automakers who were paying more attention to safety at that time. In 1988, HUD appeared as a safety feature in the selection of GM's Ozmoby Cutlassupreme model. Installed on the list. The HUD principle used in the car is that the HUD display located at the rear of the instrument panel projects important information (such as vehicle speed, navigation reminder, etc.) onto the windshield, and then reflects it to the driver through the windshield. Since the driver sees the virtual image of the HUD display, you will see that the HUD displays as if it were floating on the front hood.
The HUD system is not strictly a single electronic system. In fact, the key to imaging is optical and material science. A transparent high refractive index coating is the true imaging foundation. This film is not a separate one. It is the surface functional part of a special front windshield. This type of automotive windshield is mainly produced by dipping and screen printing. Because it contains oxidized Ti and Si, its refractive index is between 1.8 and 2.2, which is greater than the refractive index of ordinary windshield 1.52, so the reflectivity of the surface can be increased, and then after multiple optical interferences. Imaging at a distance.
The transparent magnifying reflective film used on the HUD has an initial light transmittance of about 70% and a film thickness of about 530 nm. This thickness is the peak wavelength of green selective reflection, which is the old generation HUD display of most automobiles. The reason is mostly green. Its shortcoming is not only that the color is monotonous, but also the direction of observation will cause changes in the appearance of the interference color. Therefore, the HUD projection carrier film of BMW and other companies increases the film thickness and can support the reflection in the entire visible light region, thereby realizing the multi-color display and the angle-independent uniform appearance of the HUD. Of course, it requires high-brightness light source support and high cost. .
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