Vehicle, head-up displaying system and method for adjusting height of projection image thereof

A head-up displaying system, configured to be applied in a vehicle, and comprising:

• a projector, disposed in the vehicle, and configured to project a projection image onto a front windshield such that the projection image is reflected into eyes of a driver;
• a camera, fixedly disposed in the vehicle and in front of the eyes of the driver, and configured to detect an image having locations of the eyes of the driver and a predetermined reference point;
• a seat detecting module, configured to detect a position of a seat of the driver in the vehicle so as to obtain an actual horizontal distance between the eyes of the driver and the predetermined reference point in a horizontal direction;
• and
• a head-up controller, configured to obtain the image detected by the camera and the actual horizontal distance detected by the seat detecting module, to process the image so as to obtain a position relation between the eyes of the driver and the predetermined reference point in the image, to generate an actual vertical distance between the eyes of the driver and the predetermined reference point according to the position relation and the actual horizontal distance, and to adjust a height of the projection image from the projector automatically according to the actual vertical distance,
• wherein the projector comprises a display component, and a three-mirror optical assembly positioned in an optical path of an emergent light of the display component and configured to reflect the projection image projected by the display component onto the front windshield such that the front windshield reflects the projection image into the eyes of the driver and comprising:
• a zoom lens assembly;
• an image quality compensation lens assembly;
• and
• a front windshield compensation lens assembly, configured to compensate for an image distortion caused by the front windshield and to adjust an angle of the emergent light,
• wherein the front windshield compensation lens assembly comprises:
• a housing;
• a bracket, rotatably disposed on the housing;
• an angle adjusting component, disposed on the housing and connected to the bracket, and configured to drive the bracket to rotate under control of the head-up controller;
• and
• a front windshield compensation lens, disposed on the bracket, and configured to compensate for the distortion caused by the front windshield and to adjust the angle of the emergent light,
• wherein the angle adjusting component comprises an adjusting housing, an electric motor, a gear train and a pusher;
• wherein
• the electric motor, the gear train and the pusher are disposed in the adjusting housing;
• the electric motor is connected to the head-up controller and comprises a screw shaft, the screw shaft is engaged with the gear train;
• the pusher has a pushing end connected to a back surface of the bracket and an engaging end engaged with the gear train;
• and
• a rotary motion of the gear train is converted into a liner motion of the pusher.