On-Road Dynamic Pattern Projection Using an Active Mirror for Vehicle Warning Systems

Donghee Han, Seung Soo Kwak, Jisoo Park, Yongwook Kwon, Yong Sin Kim

Research output: Contribution to journalArticlepeer-review


Recently, the demand for vehicle warning systems to avoid collisions between vehicles and pedestrians has been increasingly growing. For the implementation of such systems, three types of vehicle-to-pedestrian (V2P) technologies are widely adopted. In the first, vehicles communicate with pedestrians via smart devices using dedicated short-range communications (DSRC), but it is neither simply intuitive nor fast responsive. In the second, vehicles generate a noise in order to help pedestrians avoid collisions, at the expense of disturbing others with unwelcome noise. In the last, an on-road short-range projection technique visually informs pedestrians that a vehicle is approaching, which can be more intuitive and responsive. However, the two main drawbacks of conventional on-road projections are that they involve a static pattern and narrow emission angle. This paper proposes an on-road dynamic pattern projection technique for grabbing more attention from pedestrians with various dynamic patterns and covering a wide emission angle using an active mirror. Theoretical analysis shows that the on-road projection pattern and its angle can easily be controlled by adjusting the switching frequency, duty-cycle, and amount of current flow in the control circuitry. The simulation and experimental results validate that various patterns can be projected within a projection angle of ±70° at a power consumption less than 0.98W.

Original languageEnglish
Article number9035461
Pages (from-to)4947-4956
Number of pages10
JournalIEEE Transactions on Vehicular Technology
Issue number5
Publication statusPublished - 2020 May


  • Vehicle warning
  • active mirror
  • dynamic pattern
  • on-road projection
  • vehicle-to-pedestrian (V2P)

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Electrical and Electronic Engineering
  • Applied Mathematics


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