Scientists have created interactive, slim-paneled holographic screens (displays) that increase the viewing angle for 3D videos by 30 times. The ultra-thin glass prototype could make it easier to incorporate holographic video displays into mobile devices in the future.
The team has used their holographic screens to view a full-screen, 4K interactive video of a swimming turtle that can be viewed from a range of angles and interacted with using a keypad. Commercially available holographic video displays have not yet been introduced partly due to their narrow viewing angles, bulky optics and the heavy computing power required.
But the researchers have used a steering-backlight unit, which comprises a beam deflector, and a holographic video processor to solve these issues. The beam deflector, which consists of liquid crystal between two sheets of glass, steers the transmitted lights optically like a prism. It employs a ‘diffractive waveguide’ design, which controls the direction of light waves in a particular direction and saves energy.