The low beam light optical configuration of high brightness LED headlamp is designed in this paper. When we design low beam light, three same optical units are overlapped to achieve sufficient luminous flux. LED optical source is arranged and packaged into a LED by using multi-chip in linear array. Each unit uses multi-ellipsoid reflector to converge light issued by multi-chip high-power LED light source, which covers partial light to form by light-dark blocking some of the light baffle to form an cut-line, the light is converged through optical lens to obtain the light-type that low beam light requires. The application of ASAP software implements the simulation, and the test results show that this design meets the national standard of low beam light.

Amorphous silicon (a-Si) film crystallized by Ni-induced lateral crystallization under static electric field was analyzed. It has been demonstrated that Ni-induced lateral crystallization of a-Si is directional with electric field. Moreover, there exists a critical value of electric field strength, below which the rate of Ni-induced lateral crystallization of a-Si increases remarkably with the increase of field strength, while above which the rate will decrease instead. This phenomenon can be interpreted well based on electromigration effect.

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High brightness white light emitting diodes(LEDs) are very promising in many new illumination applications. This paper is to investigate the cooling solutions of a LED heallamp. Air cooling with heat sink were proved to be unsuitable. A cooling method based on heat pipe is adopted which is proved to be effective. Simulations were performed with Flotherm software to investigate the thermal permance.A sample of LED headlamp is fabricated based on the structure of a certain sedan combined headlamp. The testing results are in accordance with the simulation results