Integral floating-image display using two lenses with reduced distortion and enhanced depth

An integral floating display (IFD) with a long depth range without floating lens distortion is proposed. Two lenses were used to reduce barrel distortion of the floating lens and three-dimensional (3-D) image deformation from object-dependent longitudinal and lateral magnifications in the floating-display system, combined with an integral imaging display. The distance between the floating lenses is the sum of their focal lengths. In the proposed configuration, lateral and longitudinal magnifications are constant regardless of the distance of the integrated 3-D images, so the distortions from the distant-dependent magnifications of the floating lens do not occur with the proposed method. In addition, the proposed floating system expands the depth range of the integral imaging display. As a result, the display can show a correct 3-D floating image with a large depth range. Experimental results demonstrate that the proposed method successfully displays a 3-D image without floating lens distortions across a large depth range.