Head-up display system and image display method based on head-up display system

A head-up display (HUD) system, wherein the HUD system comprises a windshield, a picture generation unit (PGU), and an optical element, wherein the windshield comprises a first windshield surface and a second windshield surface;

• the PGU is configured to generate a picture, and project a light beam corresponding to the picture to the optical element;
• the optical element is configured to image the picture and direct the light beam to a target position on the first windshield surface;
• the first windshield surface is configured to refract the light beam to the second windshield surface, and reflect the light beam to a human eye for receiving, wherein after reflection by the first windshield surface, the light beam forms a first virtual image with the picture;
• the second windshield surface is configured to reflect a light beam refracted from the first windshield surface to the first windshield surface;
• the first windshield surface is further configured to refract a light beam reflected from the second windshield surface to the human eye for receiving, wherein after reflection by the second windshield surface and refraction by the first windshield surface, the light beam forms a second virtual image with the picture;
• and
• at least one processor configured to calculate an included angle between a first direction and a second direction based on a thickness of the windshield, a refractive index of the windshield, a coangle of an incident angle of the light beam directed by the optical element to the first windshield surface, and a distance between the first virtual image and the target position on the first windshield surface, and wherein the first direction is a direction from the first virtual image to the human eye, and the second direction is a direction from the second virtual image to the human eye.

An image display method applied to an HUD system, wherein the HUD system comprises a windshield, a PGU, and an optical element, wherein the windshield comprises a first windshield surface and a second windshield surface;

• and the method comprises:
• generating, by the PGU, a picture, and projecting a light beam corresponding to the picture to the optical element;
• imaging, by the optical element, the picture, and directing the light beam to a target position on the first windshield surface;
• refracting, by the first windshield surface, the light beam to the second windshield surface, and reflecting the light beam to a human eye for receiving, wherein after reflection by the first windshield surface, the light beam forms a first virtual image with the picture;
• reflecting, by the second windshield surface, a light beam refracted from the first windshield surface to the first windshield surface;
• refracting, by the first windshield surface, a light beam reflected from the second windshield surface to the human eye for receiving, wherein after reflection by the second windshield surface and refraction by the first windshield surface, the light beam forms a second virtual image with the picture;
• calculating an included angle between a first direction and a second direction based on a thickness of the windshield, a refractive index of the windshield, a coangle of an incident angle of the light beam directed by the optical element to the first windshield surface, and a distance between the first virtual image and the human eye, wherein the first direction is a direction from the first virtual image to the human eye, and the second direction is a direction from the second virtual image to the human eye;
• and
• adjusting at least one of the thickness of the windshield, the refractive index of the windshield, the coangle of an incident angle of the light beam directed by the optical element to the first windshield surface, or the distance between the first virtual image and the human eye to adjust the included angle between the first direction and the second direction to be less than a preset angle.

A display apparatus, wherein the display apparatus comprises a picture generation unit (PGU) and an optical element, wherein

• the PGU is configured to generate a picture, and project a light beam corresponding to the picture to the optical element;
• and
• the optical element is configured to image the picture and direct the light beam to a target position on a first windshield surface of a windshield, wherein the first windshield surface is configured to refract the light beam to a second windshield surface of the windshield, and reflect the light beam to a human eye for receiving, wherein after reflection by the first windshield surface, the light beam forms a first virtual image with the picture;
• the second windshield surface is configured to reflect a light beam refracted from the first windshield surface to the first windshield surface;
• the first windshield surface is further configured to refract a light beam reflected from the second windshield surface to the human eye for receiving, wherein after reflection by the second windshield surface and refraction by the first windshield surface, the light beam forms a second virtual image with the picture;
• and
• at least one processor configured to calculate an included angle between a first direction and a second direction based on a thickness of the windshield, a refractive index of the windshield, a coangle of an incident angle of the light beam directed by the optical element to the first windshield surface, and a distance between the first virtual image and the human eye, wherein the first direction is a direction from the first virtual image to the human eye, and the second direction is a direction from the second virtual image to the human eye.