This paper introduces an optimized mini-LED backlight local dimming algorithm. The proposed algorithm leverages grayscale dispersion degree to establish the grayscale distribution interval within each backlight partition. Subsequently, the actual grayscale of all backlight partitions is determined using the root mean square formula. This approach enables the accurate restoration of the overall grayscale distribution characteristics across natural image types. A 55-inch LCD prototype with 2304 mini-LED backlight partitions is developed to implement the proposed algorithm alongside traditional local dimming algorithms.
A double-layer holographic waveguide, which is made from the acrylate photopolymers, is proposed for the see-through augmented reality. The most significant contribution is the integration of ocular lenses into the waveguides. The waveguide design, imaging principle, optical simulations, and fabrication methods are introduced. In our experiments, a prototype with a diagonal field of view of 30° is demonstrated. Compared to other multi-layer waveguides, our solution could offer a more compact form factor, which is essential for wearable devices.
In this paper, RGB holographic waveguide devices are separately fabricated with the multiwavelength laser exposure method using the prepared wide-band sensitive acrylate photopolymer. Thus, for verifying the function of the prepared device, the full-color holographic waveguide near-eye display module with diagonal 30° field of view using the LCoS projector engine was developed. The results demonstrate the potential of holographic waveguide fabricated with the wide-band sensitive acrylate photopolymer in augmented reality near-eye display.
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