Abstract
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 20 cm × 15 cm. Moreover, the three HOEs of red, green and blue display images at different depths of 150 cm, 500 cm and 1000 cm, respectively. In addition, the field of view (FOV) and eye-box (EB) of the system are 12° × 10° and 9.5 cm × 11.2 cm. 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.
Highlights
THE vehicle head-up display (HUD) system can display driving information such as vehicle speed, fuel consumption, warning signals and navigation arrows to the driver through the windshield or combiner [1]–[4]
We propose an augmented reality (AR) HUD system with multi-plane, large area, high diffraction efficiency, and a single picture generation unit (PGU) based on the wavelength selectivity, angle selectivity and imaging function of volume holographic optical elements (HOEs)
The average diffraction efficiencies of the red, green and blue HOEs measured in the experiment are 75.2%, 73.1% and 67.5%
Summary
THE vehicle head-up display (HUD) system can display driving information such as vehicle speed, fuel consumption, warning signals and navigation arrows to the driver through the windshield or combiner [1]–[4]. The technical solutions to realize multi-plane display mainly include geometric optics [6]–[8], dynamic varifocal components [9]–[12], digital holography [13]–[17] and volume holography [18]. A dual-focal-plane volume holographic HUD that combines a wavelength multiplexing HOE with two PGUs is proposed [18]. We propose an AR HUD system with multi-plane, large area, high diffraction efficiency, and a single PGU based on the wavelength selectivity, angle selectivity and imaging function of volume HOEs
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