Optical Advantages of Thin Window Laminates

Paper #:
  • 2018-01-0468

Published:
  • 2018-04-03
Affiliated:
Abstract:
As the automotive industry trends toward cleaner, safer, and more connected cars, head-up displays (HUDs) are becoming increasingly prevalent. HUDs bring many benefits to the automotive space, such as keeping drivers’ eyes on the road by displaying the vehicle’s speedometer and navigation information at a distance that reduces the required visual accommodation. However, integrating this technology into standard windshield laminates that contain two layers of soda-lime glass having a thickness of 2.1 mm, can create undesirable effects for drivers. These include ghosting of the HUD image, that, over extended time, can cause driver fatigue. Replacing one of the thick soda lime glass layers with a lightweight, fusion-drawn, ion-exchanged glass panel of less than 0.7 mm thickness can significantly decrease ghosting while allowing for a larger and better-quality HUD image for drivers to enjoy, without compromising mechanical performance. Another benefit of using thinner glass is the reduced double image in transmission that minimizes distractions during night-time driving. This paper will outline the benefits thin laminates including optically–clear, fusion-formed glass provide for the future HUD-integrated windshields. It will include detailed analysis and data that compares the optical performance of thin laminate with that of a conventional windshield. We will also explore the impact of changes to wedge angle of the layer of polyvinyl butyral (PVB) to help combat HUD ghosting, especially as a function of varying windshield curvature. We will demonstrate that thin laminates have a significantly reduced double image in transmission. Thin laminate windshields are expected to provide vehicles with light-weighting and robustness benefits, while simultaneously providing optically-advantaged features for HUD and night-time driving.
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