Head-up display and vehicle equipped with head-up display

1. A head-up display mounted on a vehicle having a windshield for projecting an image on the windshield to allow an observer to visually recognize a virtual image, the head-up display comprising:

a display device that has pixels including a first-color subordinate pixel and a second-color subordinate pixel and displays an image;

a processor that controls display of the display device; and

a projection optical system that has a refractive optical system, and projects the image displayed on the display device on a viewpoint region of an observer,

wherein in relation to a deflection angle between a vector of a beam input to the refractive optical system and a vector of a beam output from the refractive optical system, the deflection angle of a beam at a reference outer side image end passing through an outer side in the refractive optical system with reference to the vehicle and the deflection angle of a beam at a reference inner side image end passing through an inner side in the refractive optical system with reference to the vehicle differ from each other, and

the processor asymmetrically shifts, between the reference outer side image end and the reference inner side image end with reference to a center, a pixel of an image formed by the second-color subordinate pixel relative to an image formed by the first-color subordinate pixel.

2. The head-up display according to claim 1 satisfying a condition (1):

1.2<(θ2 i×θ 1 o )/(θ2 o×θ 1 i )  (1)

where

θ 1 i is an angle between a vector of a reference inner side beam that is input to the windshield and a vector of the reference inner side beam reflected from the windshield;

θ 1 o is an angle between a vector of a reference outer side beam that is input to the windshield and a vector of the reference outer side beam reflected from the windshield;

θ 2 i is an angle between a vector of a reference inner side beam that is input to a refractive optical system and a vector of the reference inner side beam output from the refractive optical system; and

θ 2 o is an angle between a vector of a reference outer side beam that is input to the refractive optical system and the reference outer side beam that is output from the refractive optical system.

3. The head-up display according to claim 1 , wherein

the first-color is green-color;

the second-color is blue-color; and

the head-up display satisfies a condition (2):

1.5≤( Mi×θ 1 o )/( Mo×θ 1 i )  (2)

where

Mi is a shift-distance of the second-color pixel with reference to the first-color pixel at a reference inner side image being an end of an image reaching an inner side of a virtual image; and

Mo is a shift-distance of the second-color pixel with reference to the first-color pixel at a reference outer side image being an end of an image reaching an outer side of a virtual image.

4. The head-up display according to claim 1 , wherein

the refractive optical system has a greater curvature in a vehicularly front-rear direction than in a vehicularly right-left direction.

5. The head-up display according to claim 1 , wherein

the refractive optical system is arranged eccentrically with respect to a reference beam that passes through a center of the image.

6. The head-up display according to claim 1 , wherein

the refractive optical system is eccentric relative to a reference beam that passes through a center of the image.

7. A vehicle comprising the head-up display according to claim 1 .