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Optical Film with Microstructures to Regulate Viewing Angle of HUDs.

Qibin Feng1, Xiangjun Li2, Chunhui Chen2

  • 1Special Display and Imaging Technology, Innovation Center of Anhui Province, Anhui Province Key Laboratory of Measuring Theory and Precision Instrument, Hefei University of Technology, Hefei 230009, China.

Micromachines
|June 27, 2025
PubMed
Summary

This study introduces a novel method for head-up displays (HUDs) to independently adjust horizontal and vertical viewing angles. The developed optical film significantly widens the horizontal field of view, enhancing driving safety.

Keywords:
head-up displaymicrostructureoptical filmviewing angle

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Area of Science:

  • Optics
  • Automotive Engineering
  • Human-Computer Interaction

Background:

  • Head-up displays (HUDs) improve driving safety by projecting information onto windshields, reducing the need for drivers to look down.
  • Current HUDs often lack independent control over horizontal and vertical viewing angles, limiting their effectiveness.
  • A wider horizontal viewing field is crucial for drivers to monitor road conditions effectively.

Purpose of the Study:

  • To propose and validate a method for independently regulating the horizontal and vertical viewing angles of HUDs.
  • To design an optical film with microstructures capable of achieving differentiated viewing angles.
  • To enhance driving safety by optimizing the visual field provided by HUDs.

Main Methods:

  • Modeling the microstructure morphology as an ellipsoid.
  • Calculating the curvatures of the ellipsoid's major and minor axes based on desired viewing angles.
  • Simulating and experimentally measuring the viewing angles and luminance distribution of the optical film.

Main Results:

  • Simulation showed an increase in horizontal viewing angle from 2° to 20° (at 85% max luminance) with the film.
  • Simulation indicated an increase in vertical viewing angle from 2° to 8° (at 85% max luminance) with the film.
  • Experimental measurements confirmed significant differentiation, with horizontal viewing angle increasing to 23° and vertical to 10° (at 85% max luminance).

Conclusions:

  • The proposed method successfully enables independent regulation of horizontal and vertical viewing angles for HUDs.
  • The developed optical film effectively widens the horizontal viewing angle, meeting design requirements.
  • This advancement contributes to improved driving safety through optimized head-up display technology.