OPTICAL LAMINATE FOR HEAD-UP DISPLAY, FUNCTIONAL GLASS, AND HEAD-UP DISPLAY SYSTEM

The present invention relates to an optical laminate for a head-up display (10), including: (A) at least one polyvinyl acetal resin layer (101) having a photoelastic coefficient (PeA) in the range of the following Expression (1) and (B) at least one optical functional layer (102). Further, the present invention relates to functional glass for a head-up display (20) including: the optical laminate (10) and a head-up display including: the optical laminate (10) or the functional glass (20).[Expression 1] PeA≤4.0×10−11Pa−1