Dynamic automotive front lighting system using electrowetting
Publication Date: 2005-Nov-24
The IP.com Prior Art Database
Adaptive front lighting systems (AFS) are headlight systems that provide a degree of "intelligent" response to driving conditions. At the moment AFS systems are based on mechanical movements. In this invention, a system is proposed that uses an electro- wetting device to change the beam direction continuously by applying a variable voltage. This could be used in the automotive industry for AFS.
Light emitted from a light source (i.e. LED(s), or Halogen or Xenon) is collected and shaped by optical component(s) like collimator(s) or reflector(s) in order to fulfill the required beam performance. An electro-wetting device, which is for instance put in front of other optical component(s) is shown in figure 1.
Figure 1. Dynamic front lighting system
When applying a continuously varying voltage (V1, V2, ...), the interface-shape of two liquids changes continuously leading to a continuous change of beam directions (q1, q2, ...) (figure 2).
(a) switch off voltage
Reflector or collimator
LEDs or Halogen or Xenon
(b) switch on voltage (V1, V2, V3)