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In the conventional freeform lens design, people usually assume the inner surface as hemispherical and only the outer surface is designed. An important design degree of freedom on the inner surface is abandoned. In this study, by distributing the deviation angle, we proposed a method to design the inner and outer surfaces of freeform lens simultaneously. Detailed design method was presented and several...
In this study, a method based on the definition of illuminance was presented to design freeform lens for uniform illumination in direct-lit light emitting diode (LED) backlight with high distance-height ratio (DHR). The principle and algorithms of the design method were introduced and several design examples were presented and discussed. Compared with traditional hemispherical lens, the freeform lens...
High power white light emitting diodes (LEDs) have begun to play an important role in many illumination applications due to their excellent performance. In this paper, an effective freeform lens design method for extended light source was suggested briefly for the first time and two compact LED packaging freeform lenses, with the material of polycarbonate (PC) and silicone respectively, were designed...
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