A multi-plane augmented reality head-up display system based on volume holographic optical elements with large area
This addresses the need for improved augmented reality navigation displays in vehicles and aviation, representing an incremental advancement in HUD technology.
The paper tackled the problem of traditional head-up displays having small areas and single planes by proposing an augmented reality HUD system with multi-plane, large area, high diffraction efficiency, and a single picture generation unit, achieving diffraction efficiencies of 75.2%, 73.1%, and 67.5% for red, green, and blue holographic optical elements, respectively, and displaying images at depths of 150cm, 500cm, and 1000cm.
The traditional head-up display (HUD) system has the disadvantages of a small area and a single display plane, here we propose and design an augmented reality (AR) HUD system with multi-plane, large area, high diffraction efficiency and a single picture generation unit (PGU) based on holographic optical elements (HOEs). Since volume HOEs have excellent angle selectivity and wavelength selectivity, HOEs of different wavelengths can be designed to display images in different planes. Experimental and simulated results verify the feasibility of this method. Experimental results show that the diffraction efficiencies of the red, green and blue HOEs are 75.2%, 73.1% and 67.5%. And the size of HOEs is 20cm*15cm. Moreover, the three HOEs of red, green and blue display images at different depths of 150cm, 500cm and 1000cm, respectively. In addition, the field of view (FOV) and eye-box (EB) of the system are 12°*10° and 9.5cm*11.2cm. Furthermore, the light transmittance of the system has reached 60%. It is believed that this technique can be applied to the augmented reality navigation display of vehicles and aviation.