Spatial loss factor for the analysis of accommodation depth cue on near-eye light field displays

In order to address the vergence-accommodation conflict problem, a generalized model consisting of a human visual system for the 4D light field display system was proposed. This model includes the key factors, such as retinal resolution, the central depth plane (CDP), and the proposed spatial loss factor, for the light field display system. The spatial resolution of the target plane in the depth of field (DOF) were quantitatively evaluated based on the proposed model. The results showed that the inconsistency of spatial resolution in DOF results in unstable eye accommodation response. Based on the fovea resolution-limit, we evaluated and simulated the resolution of perceived images on retina and the accommodation response based on spatial loss factor. The simulation results verified that a near-eye light field display (NE-LFD) configuration with a spatial loss factor greater than 0.8, corresponding to 2 by 2 views, or a minimum spatial loss factor 0.6, corresponding to 3 by 3 views, has the ability to render a nearly correct focus cues and accommodation response.