Display apparatus, movable body apparatus, producing method of the display apparatus, and display method

1. A display apparatus, comprising:

an optical system configured to irradiate light to form an image on a transmissive reflector provided in a movable body to display a virtual image at a position in a display area on a display surface of the transmissive reflector so that the virtual image overlaps with scenery outside the movable body, wherein

the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that (1) a given distance range in the scenery from a set reference viewpoint in the movable body is included in the display area, and (2) a difference between a first convergence angle to a target object present in the given distance range and a second convergence angle to the virtual image displayed in the display area on the display surface of the transmissive reflector is at most one degree.

2. The display apparatus as claimed in claim 1 , wherein a distance between a given point in the display area and the reference is four meters or longer and ten meters or shorter.

3. The display apparatus as claimed in claim 1 , wherein when the target object is present at a given point of an upper limit in the given distance range and the virtual a is displayed at a given point in the display area, the difference between the first convergence angle and the second convergence angle is at most one degree.

4. The display apparatus as claimed in claim 1 , wherein a top end of the display area is located at a position lower than the reference viewpoint.

5. The display apparatus as claimed in claim 1 , wherein a height of the reference viewpoint within a height range including a middle value that is a height of a point in designing the movable body plus or minus 10% a length of a vertical line virtually extending between a given face and the height of the point in designing the movable body.

6. The display apparatus as claimed in claim 5 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that a first range that is at least 60% of the given distance range is included in the display area when an upper limit of the height range, and a second range that is at least 60% of the given distance range is viewed in the display area when a lower limit of the height range.

7. The display apparatus as claimed in claim 6 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that the virtual image is displayed in the display area to overlap an overlapping area of the first range and the second range.

8. The display apparatus as claimed in claim 5 , wherein the height of the reference point is set higher than the height of the middle value in the height range.

9. The display apparatus as claimed in claim 1 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that a lower limit of the given distance range is 13 meters to 16 meters.

10. The display apparatus as claimed in claim 1 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that an upper limit of the given distance is at most a maximum detection distance of a detector configured to detect a distance between the movable body and the target object.

11. The display apparatus as claimed in claim 1 , further comprising circuitry configured to set a vertical position and a front-rear position of the display area of the virtual image so that the difference between the first convergence angle to the target object present in the given distance range and the second convergence angle to the virtual image displayed in the display area is at most one degree.

12. The display apparatus as claimed in claim 1 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that the virtual image includes an indicator that three-dimensionally matches the target object.

13. The display apparatus as claimed in claim 12 , wherein the circuitry is further configured to cause the optical system to display the virtual image so that the indicator that three-dimensionally matches the target object indicates a distance between the movable body and a preceding object that is the target object.

14. The display apparatus as claimed in claim 12 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that the indicator that three-dimensionally matches the target object informs a presence of the target object.

15. The display apparatus as claimed in claim 12 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that the indicator that three-dimensionally matches the target object indicates information on a scheduled travelling route of the movable body.

16. The display apparatus as claimed in claim 1 , the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that another indicator that does not three-dimensionally match the target object is displayed.

17. The display apparatus as claimed in claim 16 , wherein the optical system is configured to irradiate the light to display the virtual image at the position in the display area on the display surface of the transmissive reflector so that the another indicator that does not three-dimensionally match the target object includes at least one of an indicator indicating the target object, an indicator indicating information on the movable object, and an indicator relating to a scheduled travelling route of the movable body.

18. A movable body apparatus comprising:

the display apparatus of claim 1 ; and

a movable body in which the display apparatus is installed.

19. A producing method of a display apparatus for displaying a virtual image in a display area on a display surface of a transmissive reflector so that the virtual image overlaps with scenery outside a movable body, the producing method comprising:

setting a reference viewpoint in the movable body; and

setting a position of the display area of the virtual image to include a given distance range in the scenery from the reference viewpoint so that a difference between a first convergence angle to a target object present in the given distance range and a second convergence angle to the virtual image displayed in the display area on the display surface of the transmissive reflector is at most one degree.

20. A display method for displaying a virtual image in a display area on a display surface of a transmissive reflector so that the virtual image overlaps with scenery outside a movable body, the display method comprising:

setting a reference viewpoint in the movable body;

setting a position of the display area of the virtual image to include a given distance range in the scenery from the reference viewpoint so that a difference between a first convergence angle to a target object present in the given distance range and a second convergence angle to the virtual image displayed in the display area on the display surface of the transmissive reflector is at most one degree;

displaying the virtual image in the display area having the set position.