2.2 DLP 技术在高分辨率前照灯应用中的优势

In this TI DLPLabs video, we will describe some key advantagesof using DLP technology for high-resolutionheadlight applications and describe sometypical use cases. DLP technology enablesincredibly high-resolution headlight modules. The automotive-qualifiedDLP5531-Q1 DMD, or Digital Micromirror Device,has over 1 million pixels. And there's nosacrifice to style when the final lens height ofa DLP5531-Q1 headlight module can remain under 40 millimeters. A headlight module thatuses DLP technology can be designed with LEDor laser illumination. DLP technology has been provenover 20 years in markets such as cinema andenterprise projection, and now it'sautomotive-qualified and in productionvehicles today. What can a headlight dowith 1 million pixels? One application is AdaptiveDriving Beam, or ADB. ADB allows the high beamto remain on continuously while shaping lightaround oncoming traffic. DLP technology'shigh-resolution allows precise illuminationcontrol, put light exactly where it is neededso more of the high beam can remain on at all timeswithout blinding oncoming traffic or pedestrians. More light can show driversand ADAS systems everything in view, giving them more timeto react to changes if needed. High resolution can also createsmooth, gradient transitions in the light shape to avoidrapid, jerking motion of light that can be seen inlow-resolution ADB options. Use the full programmabilityof high-resolution headlights to reinvent how vehiclesand drivers see at night. Highly reflective road signs canglare drivers and oversaturate camera sensors. With high-resolutionDLP technology, the headlight candim or turn off pixels to avoid glarefor the driver or camera while highlightingpedestrians, cyclists, and obstacles to give the driverand ADAS systems time to react. And ADB is only thebeginning of what a high-resolutionheadlight can do. Any custom content canbe displayed on the road. This enables a new communicationchannel between the vehicle and the driver. Here, the headlights are usedto project lines indicating a vehicle path and to show thevehicle width as it traverses a narrow construction zone. Lane marking can givedrivers and also other cars more confidence to safelynavigate through hazards by communicating intent. Only the highest resolutionmakes symbol projection possible. Symbol projectionenables welcome messages to the driver, differentiatedbranding, navigation, warnings, and other vehicle-to-everything,or V2X, communication to be conveyed on the road. Here, an arrow and distanceare projected onto the road to indicate wherea turn is located. But how many pixels doesa headlight really need to perform these functions? To answer that, let's lookat the navigation symbol that was projected onthe previous slide. We can assume the headlightis mounted in the vehicle approximately 60centimeters above the road. The symbol is 2 meterslong and projected at a distance of 10 meters. Because of the steep anglethat this symbol is projected on the ground, it actuallyfills less than 1 degree of the headlights'entire field of view. These images showthe flattened image from the headlights'perspective. In a typical design,the DLP5531-Q1 DMD is able to use 50 to100 lines of pixels to display this symbol due toits high pixels per degree, depending on the optical design. Other so-called high-resolutionheadlight technologies struggle with too few pixelsfor this level of detail. Click the links on this slideor immediately below this video to learn more aboutDLP technology in high-resolution headlights. Our white paper, Trends inHigh-Resolution Headlamps, provides more detailon headlight field of view and resolution. For more information,visit TI.com/DLP. Thanks for watching.