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Smart automotive headlamp based on arrays of optical shutters


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Smart automotive headlamp based on arrays of optical shutters

  1. 1. Smart automotive headlamp based on arrays of optical shuttersHow to make cars lighter, safer and cheaper with an innovativeand smart front lighting system… Boris Lamontagne, researcher
  2. 2. Basic idea: replace the HID shutter withswitchable glass based on optical shuttersSome High-Intensity Discharge (HID) headlamps have a mechanicalshutter actuated by a solenoid, in order to switch to low or high beams: (taken from Wikipedia) 2
  3. 3. Study of the MSU-Hyundai-Kia:A report of the Michigan State University and Hyundai-Kia showed howsmart glass could replace mechanical shutter in HID headlamp.However, they concluded that the existing smart glass technologies(SPD, PDLC, EC) did not have the required performances to replacemechanical shutters.The required performances are :1. switching time of less than 0.5 seconds,2. less than 2% transmittance in closed state and3. 90% or more transmittance in open state.They did not know about NRC’s smart glass. 3
  4. 4. The best smart glass candidate to replace HIDmechanical shutters:The NRC smart glass based on micro-blinds could meet the two firstheadlamp requirements, while we think we could reach 80%transmittance. Moreover contrary to the other types of smart glasses,the micro-blinds are very robust to temperature extremes.The micro-blinds are based on tiny curling electrodes actuated by electrostatic forces(voltage). 4
  5. 5. Micro-blinds for headlamps: extra functionalitiesSmart glass based on micro-blinds could be very easilypatterned in arrays separately addressable. Turning High: leveling, selective illumination signal Steering Low beam Coarse example of a possible array design for left-hand sideMoreover, micro-blinds are switching very fast , thus allowing them to send opticalmessages to various potential receptors (cars, street lights, garage doors, etc). 5
  6. 6. ReferencesMicro-blinds:1. B.Lamontagne et al. ‘The next-generation of switchable glass: the Micro-blinds’, proceedings of the Glass Performance Days, 2009, p.637, 2009.2. Wikipedia: ‘smart glass’3. Video report:Automobile Headlamp High Beam Switching Using Smart Glass ’Benefit of Headlamp leveling and cleaning for current US low beams’, Mike Flannagan et al, UMTRI-2007-462. Optical design of automotive headlight system incorporating digital micromrror device’, C.C. Hung et al., Appl. Optics 49, 4182 (2010).3. ’Good headlamp’ Presentation to NHTSA workshop, 2004 ( ’High Dynamic Headlamp system based on a segmented shutter’ Mojrzisch and Strausse.5. ’Development of an Adaptative Headlamp Systems’ M. Hrairi and A. Bakar, International Conference on Computer and Communications Engineering, 2010.6. ’Analysis of the world OEM headlamp market for cars and trucks’, R. Wuthrich, thesis, University of Applied Sciences Northwestern Switzerland, 2009.7. ’Assessment of headlamp glare and of potential countermeasures, Survey of Advanced Front Lighting System (AFS) Research and Technology, National Highway Traffic Safety Administration, DOT HS 809 973, 2005.8. Youtube video:,, 6
  7. 7. SummaryNRC’s smart glass based on micro-blindshas the potential to replace mechanicalshutters in HID headlamps, and add veryinnovative and attractive functionalities. 7
  8. 8. Thank youWe are looking for industrial partners tomove this technology furtherPlease contact