$holographic diffraction grating sheet$

$holographic diffraction grating sheet$

Inevitable color differences and narrow viewing angle seriously affect the holographic display effect and hinder the application of holographic 3D display in many fields. However, the color and viewing angle of holographic 3D display mainly depend on the wavelength of laser and the pixel size of current spatial light modulator (SLM). Color holographic 3D display with large viewing angle has always been pursued, and it has important application values in medical treatment, industrial inspection, education and entertainment 3, 4, 5. Holographic display technology can completely record and reconstruct the wavefront information of 3D objects, and it is one of the most promising naked-eye 3D display technologies 1, 2.

$holographic diffraction grating sheet$

This work presents a paradigm for achieving desirable holographic 3D display, and is expected to provide a new way for the wide application of holographic display. The proposed system shows a color viewing angle of ~50.12°, which is about 7 times that of the traditional system with a single spatial light modulator. In principle, a chromatic aberration-free hologram generation mechanism in combination with the color liquid crystal grating is proposed to pave the way for on such a superior holographic 3D display. The use of color liquid crystal grating allows performing secondary diffraction modulation on red, green and blue reproduced images simultaneously and extending the viewing angle in the holographic 3D display system. Here, we conceptually propose and experimentally demonstrate a simple and feasible pathway of using a well-designed color liquid crystal grating to overcome the inevitable chromatic aberration and enlarge the holographic viewing angle, thus enabling large-viewing-angle and color holographic 3D display. However, it is challenging to simultaneously achieve large viewing angle and high-fidelity color reconstruction due to the intractable constraints of existing technology. Holographic 3D display is highly desirable for numerous applications ranging from medical treatments to military affairs.

$holographic diffraction grating sheet$

Holographic diffraction grating sheet