Head-up display system and transportation machine

A head-up display system comprising:

• a windshield glass having a selective reflection layer;
• and
• a projector including a laser light source for forming a projection image on the windshield glass,
• wherein the selective reflection layer includes three wavelengths of λB, λG, and λR as selective reflection central wavelengths at a light incidence angle of 60°,
• 400
• ⁢
• nm
• ≤
• λ
• B
• <
• 500
• ⁢
• ⁢
• nm
• 500
• ⁢
• nm
• ≤
• λ
• G
• <
• 600
• ⁢
• ⁢
• nm
• 600
• ⁢
• nm
• ≤
• λ
• R
• <
• 700
• ⁢
• ⁢
• nm
• the laser light source emits laser beam of three colors of blue light, green light, and red light, and
• all of the following regulations (a) to (c) are satisfied,
• regulation (a) 0.80≤XB/XG≤1.20
• regulation (b) 0.80≤XB/XR≤1.20
• regulation (c) 0.80≤XG/XR≤1.20
• in the regulations, XB=RB×LB, XG=RG×LG, and XR=RR×LR,
• RB indicates a natural light reflectivity of the selective reflection layer at λB,
• RG indicates a natural light reflectivity of the selective reflection layer at λG, and
• RR indicates a natural light reflectivity of the selective reflection layer at λR, and
• LB represents brightness of blue laser beam in light emitted from the projector,
• LG represents brightness of green laser beam in the light emitted from the projector, and
• LR represents brightness of red laser beam in the light emitted from the projector.