Fig. 1. Two cases for lensless holographic projection.

Fig. 2. Illustration of CGH calculation and reconstruction in lensless holographic projection system.

Fig. 3. Principle of image magnification by using spherical wave illumination. (a) Plane wave illumination, the maximum reachable image size is limited by Nyquist criterion. (b) Convergent spherical wave illumination, the image is reconstructed with a larger size due to the enlargement of the diffraction angle.

Fig. 4. Optical setup for lensless holographic projection using convergent spherical beam illumination.

Fig. 5. (a) Projected screen marked with the size of the target projected image. (b) Reconstructed image under conventional plane wave illumination. (c) Reconstructed image with magnified size under conventional plane wave illumination. (d) Reconstructed image with magnified size under spherical wave illumination.

Fig. 6. Optical reconstructions of image magnified lensless holographic projection. (a)–(d) Monochromatic reconstructions of “Monalisa”, “Baboon”, “Fruits”, and “Parrots” with image width of 34.56 cm and image height of 19.44 cm, respectively. (e) and (f) are one frame extracted from two 1080P high definition animations (Visualizations 1 and 2), respectively.

Fig. 7. Optical reconstructions of color projected images. (a)–(c) Individual reconstruction of red, green, and blue components of “Monalisa”, respectively. (d)–(f) Color reconstructions of “Monalisa”, “Fruits”, and “Parrots” with image width of 34.56 cm and image height of 19.44 cm, respectively.

Fig. 8. Comparison of reconstructed images by considering the actual interferences.