Tapered Surface Optical Control for Whole Circumference Display Luminance

The patent applies local quality by varying the incident angle of light across different regions of the projection screen. By controlling the optical portion to emit light at different angles toward different azimuthal positions on the whole circumference screen, the system achieves uniform luminance distribution. Each local region receives optimized illumination according to its specific position, resolving the uneven luminance problem while maintaining high image quality.

The patent employs parameter changes by dynamically adjusting the incident angle of light as a key parameter. The optical portion changes the emission angle according to the azimuthal position on the screen, creating optimized optical paths that minimize outside light reflection. This parameter optimization allows the system to maintain relatively simple device structure while effectively suppressing harmful reflections through precise angular control.

The patent applies dynamics by making the incident angle a dynamic parameter that varies with the azimuthal position on the screen. Rather than using a fixed optical system, the patent employs an optical portion that dynamically adjusts light emission angles according to position requirements. This dynamic control achieves high display quality with optimized incident angles while keeping the overall device complexity manageable through coordinated optical design.