Abstract
We propose augmented reality (AR) near-eye display using a holographically printed freeform mirror array. A wide depth of field AR system is implemented by the retinal projection via a small mirror array. Since we use a holographic mirror array, more advantages over a traditional physical mirror array are achieved. Due to the see-through characteristics of the holographic optical element (HOE), the array structure does not obstruct the sight of an observer. Also, the holographic printing technique for the freeform mirror array enables a wide depth of field system without using a floating lens and compensates for the astigmatism of the HOE. The detailed design method of the freeform mirror array HOE is presented. Through the retinal image simulations and the experimental results, the feasibility of the proposed method is verified.
Highlights
T HE advances in microprocessor, communication, display, and battery technologies have expanded the market of mobile devices
In this Letter, we propose a concept of retinal projection type augmented reality (AR) near-eye displays (NEDs) using a freeform mirror array (FMA) holographic optical element (HOE) which is manufactured by a holographic printer
In order to confirm that the fabricated FMA HOE generates the depth of field (DOF) in the desired depth range, we manufacture a plane mirror array HOE in the same way and conduct display experiments to compare
Summary
T HE advances in microprocessor, communication, display, and battery technologies have expanded the market of mobile devices. Studies on AR devices with compact form factors [1], [2], wide field of view (FOV) [3]–[5], enlarged eye-boxes [6]–[9], and providing focus cue [10], [11] were introduced recently. Major companies but startups such as LentinAR [12] and MagicLeap [13] have recently announced AR glasses technologies and successfully attracted public attention [14]. In order to respond to a focal change of the user’s eyes, AR glasses should change the depth of the displayed image in real-time or provide an image with a wide depth of field (DOF) to see a clear image regardless of the eye focus [16]. To construct the wide DOF AR display, research on retinal projection
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