Optical laminate and functional glass for head-up display, and head-up display system

Abstract

The present disclosure relates to an optical laminate for a head-up display, including (A) at least one polyvinyl acetal resin layer having a photoelastic coefficient (PeA) in the range of the following Expression (1) and (B) at least one optical functional layer. Further, the present disclosure relates to functional glass for a head-up display including the optical laminate. and a head-up display including: the optical laminate or the functional glass. PeA ≤ 4.0 × 10 − 11 Pa − 1 ... (1)

Dependencies are inferred from the claim text.