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Microlens array-based high-gain screen design for direct projection head-up displays.

M Kivanc Hedili1, Mark O Freeman, Hakan Urey

  • 1Optical Microsystems Laboratory, Koc University, İstanbul, Turkey.

Applied Optics
|February 26, 2013
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Summary
This summary is machine-generated.

This study introduces a compact direct projection Head-Up Display (HUD) system using a novel windshield-embedded screen. This innovative design minimizes dashboard space while enhancing driver visibility and safety.

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Area of Science:

  • Automotive Technology
  • Optics and Photonics
  • Human-Computer Interaction

Background:

  • Traditional virtual image Head-Up Display (HUD) systems require significant space for relay optics, limiting compactness.
  • Increasing field of view in HUDs exacerbates space constraints.
  • Direct projection HUDs with separate microlens array (MLA) screens offer a more compact alternative.

Purpose of the Study:

  • To propose a novel, space-saving direct projection HUD system.
  • To develop an elegant and compact HUD solution using a unique windshield-embedded screen.
  • To address the limitations of existing HUD technologies regarding volume and integration.

Main Methods:

  • Development of a direct projection HUD system incorporating a windshield-embedded see-through screen.
  • Utilization of microlens arrays (MLAs) with varying surface normal angles within the screen.
  • Design enabling light projection directly to the viewer's eyes across the entire field of view.

Main Results:

  • The proposed system offers a compact solution with minimal under-dashboard space requirements.
  • The MLA screen with varying tilts achieves efficient light relay and high brightness.
  • Calculated screen gain is approximately 69, with a substantial eyebox area of 30 cm×30 cm.

Conclusions:

  • The windshield-embedded MLA screen provides an elegant and compact solution for direct projection HUDs.
  • The system effectively directs light to the driver's eyes, ensuring visibility and safety.
  • This technology overcomes space limitations of traditional HUDs, enabling wider adoption.