Abstract
We present here an optical approach to boost the apparent pixel density by utilizing the superimposition of two shifted-pixel grids generated by a Pancharatnam-Berry deflector (PBD). The content of the two shifted pixel grids are presented to the observer's eye simultaneously using a polarization-multiplexing method. Considering the compact and lightweight nature of PBD, this approach has potential applications in near-eye display systems. Moreover, the same concept can be extended to projection displays with proper modifications.
Highlights
Virtual reality (VR) offers eye-opening immersive experiences, where the artificial simulated environment can be as fascinating as the real one
Making use of the polarization selective nature of Pancharatnam-Berry deflector (PBD), the brightness separation ratio between two virtual pixels can be tuned by modulating the ratio between LCP and RCP fraction of input light using a pixelated polarization modulation layer (PML)
It should be mentioned that the PML adapted from a commercial LCD panel is not designed for polarization modulation, which may lead to some crosstalk between adjacent pixels, depending on the distance between the definition layers of PML and the display panel
Summary
Virtual reality (VR) offers eye-opening immersive experiences, where the artificial simulated environment can be as fascinating as the real one. In spite of the challenges in manufacturing high PPI panels, as the pixel density increases, display luminance may decrease because of the reduced aperture ratio [3], and data flow rate in driving electronics will increase . This approach offers an elegant design balance between FOV and panel pixel density, lowering the total pixel numbers while providing satisfactory high-resolution experience.
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