Optical design and optimization of light emitting diode automotive head light with digital micromirror device light emitting diode

This research proposes a new method for light emitting diode automotive headlight design with digital micromirror device (DMD). The optical design is advanced because of the following features. First, this optical design controls the angle of light pattern without light masking so as to achieve much higher light efficiency compared with traditional optical design for headlight systems. Second, in view of the tendency that the advanced light emitting diode automobile headlight is designed to be a low beam light module and a high beam light still needs an auxiliary lighting system, the optical system designed in this research, mainly adopting DMD module as high/low beam light switch, can switch on and off both the high and low beam lights. Because DMDs function of accepting a bidimensional image, high/low beam light patterns can be determined by DMD. Third, a light pattern will be created and compensated simultaneously by DMD, which might replace mechanical adaptive front-lighting system in the future because DMD takes advantage of fast response and simultaneous compensation. Fourth, a design using a multiple reflection curved mirror is employed in this research to adjust light energy distribution; therefore, the articulation of the light pattern can be enhanced. For this method, experimental results of light efficiency are up to 85%, which is superior to current products in the market.