Asymmetric Wire-Grid Polarizer for Wide-Angle Transmittance

The patent applies local quality by creating asymmetric absorption layer structures at different positions within the lattice-shaped convex portions. Specifically, the absorption layer has different thicknesses or widths at different locations (e.g., larger width at the incident light side), which locally optimizes the optical properties to compensate for angle-dependent losses while maintaining the overall high extinction ratio characteristic of wire grid polarization elements.

The patent employs asymmetry by designing the absorption layer with non-uniform dimensions - the width of the absorption layer at the incident light side is made larger than at the opposite side. This asymmetric configuration creates differential optical path lengths and absorption characteristics that specifically compensate for the decrease in transmission axis transmittance caused by large incident angle variations, while preserving the polarization filtering function.

The patent resolves this contradiction by applying local quality through spatially varying absorption layer dimensions. The absorption layer is designed with different widths at different positions - specifically, the width at the incident light side is larger to enhance transmission axis transmittance, while the width at the opposite side is smaller to maintain extinction ratio. This localized differentiation allows simultaneous optimization of both parameters.

The patent utilizes parameter changes by varying the absorption layer width parameter across different spatial positions within the same polarization element structure. By controlling the absorption layer width to be larger at the incident light side and smaller at the opposite side, the patent creates a gradient in optical absorption characteristics that compensates for angle-dependent transmission losses without compromising the fundamental polarization filtering performance.