HUD field of view expansion

A method of enlarging the field of view of a head up display for a vehicle, comprising:

• splitting, with a controller a holographic image into a first half image and a second half image;
• calculating, with the controller, phase holograms for each of the first half image and the second half image;
• sequentially and alternately, with a phase light modulator (PLM) having a defined field of view (FOV), receiving, from a holographic projector adapted to project a holographic image, the first half image and the second half image, and, encoding the first half image and the second half image;
• sequentially and alternately, with a digital light processor (DLP), receiving the first half image and second half image from the PLM;
• and
• sequentially, with the DLP, directing the first half image to a first position on an inner surface of a windshield of the vehicle, and directing the second half image to a second position on the inner surface of the windshield of the vehicle and adjacent to the first position;
• wherein, the first half image displayed at the first position and the second half image displayed at the second position result in a re-creation of the holographic image, displayed on the inner surface of the windshield, and having a FOV that is twice the size of the FOV of the PLM.

A head up display for a vehicle, comprising:

• a holographic projector including a red laser, a green laser and a blue laser, and adapted to project a holographic image;
• a controller adapted to split a holographic image into a first half image and a second half image and to calculate a red phase hologram, a green phase hologram and a blue phase hologram for the first half image, and to calculate a red phase hologram, a green phase hologram and a blue phase hologram for the second half image;
• a phase light modulator (PLM) having a defined field of view (FOV) and adapted to sequentially and alternately receive and encode the red phase hologram, the green phase hologram and the blue phase hologram for the first half image, and the red phase hologram, the green phase hologram and the blue phase hologram for the second half image;
• and
• a digital light processor (DLP) adapted to:
• sequentially receive the red phase hologram, the green phase hologram and the blue phase hologram for the first half image and the red phase hologram, the green phase hologram and the blue phase hologram for the second half image from the PLM;
• and
• sequentially:
• direct the red phase hologram for the first half image to the first position on the inner surface of the windshield of the vehicle for less than 10 μs;
• direct the green phase hologram for the first half image to the first position on the inner surface of the windshield of the vehicle for less than 10 μs;
• direct the blue phase hologram for the first half image to the first position on the inner surface of the windshield of the vehicle for less than 10 μs;
• direct the red phase hologram for the second half image to the second position on the inner surface of the windshield of the vehicle for less than 10 μs;
• direct the green phase hologram for the second half image to the second position on the inner surface of the windshield of the vehicle for less than 10 μs;
• and
• direct the blue phase hologram for the second half image to the second position on the inner surface of the windshield of the vehicle for less than 10 μs;
• and
• use a compensation algorithm to precisely match an FOV of the red phase hologram, the green phase hologram and the blue phase hologram for each of the first half image and the second half image, due to varying wavelength of the red, green and blue lasers;
• wherein, the first half image displayed at the first position and the second half image displayed at the second position result in a re-creation of the holographic image, displayed on the inner surface of the windshield, and having a FOV that is twice the size of the FOV of the PLM, and the DLP includes a photo sensor with active feedback and is adapted to maintain color alignment and image edge alignment between the first half image and the second half image, and to blend adjacent edges of the first half image and the second half image to allow overlapping of the adjacent edges of the first half image and the second half image.