Head-up display glass and head-up display system

A head-up display system, comprising a projection device and head-up display glass, wherein the head-up display glass comprises outer glass, inner glass, an interlayer, and a reflective coating, wherein the outer glass has a first surface and a second surface opposite to the first surface, the inner glass has a third surface and a fourth surface opposite to the third surface, the third surface is opposite to the second surface, the interlayer is disposed between the second surface and the third surface, and the reflective coating is disposed on the fourth surface, and the reflective coating is configured to reflect P-polarized light;

• and the reflective coating comprises at least one low-emissivity layer and at least one laminated structure that are stacked, each of the at least one laminated structure comprises a high-refractive-index layer and a low-refractive-index layer that are stacked in sequence, and in each of the at least one laminated structure, the high-refractive-index layer is closer to the fourth surface than the low-refractive-index layer, the high-refractive-index layer has a refractive index greater than or equal to 1.8, and the low-refractive-index layer has a refractive index less than 1.8;
• wherein
• the projection device is configured to produce projection light, at least 80% of the projection light is P-polarized light, and the projection light is incident on the reflective coating at an incident angle ranging from 450 to 85°.