Multistep Diffractive Optical Element With Inclined Portions

The patent applies curvature by replacing vertical sidewalls with inclined portions that have gradual slopes. This curved/transitional geometry reduces abrupt refractive index changes at interfaces, thereby minimizing interfacial reflection and improving optical utilization efficiency without requiring complex multilayer anti-reflection coatings.

The patent changes the geometric parameters of the DOE structure by introducing inclined portions with specific angles and multistep configurations. This parameter modification transforms the abrupt vertical interface into a gradual transition, reducing reflection losses while maintaining manufacturing feasibility through controlled structural complexity.

The inclined portions with gradual slopes provide angle-insensitive light distribution by reducing sensitivity to incidence angle variations. This curved geometry allows the DOE to maintain stable diffracted light patterns even when the incidence angle deviates from the design value, improving reliability without requiring overly complex manufacturing processes.

The multistep structure with inclined portions creates a more dynamic light interaction that adapts to varying incidence angles. The gradual transitions in the structure allow the DOE to maintain functional performance across a range of angles, providing stability without sacrificing manufacturability.

The patent divides the single-step structure into multiple steps with inclined portions, creating a segmented geometry that progressively transitions light. This segmentation improves light distribution uniformity by controlling the diffraction process in stages, while the standardized inclined portion design keeps manufacturing precision requirements within achievable limits.

The multistep configuration changes the geometric parameters of the DOE structure, creating multiple transition zones that improve light distribution uniformity. By carefully selecting the number of steps and incline angles, the patent achieves uniform light distribution while maintaining manufacturing precision within practical limits.

The patent extracts the anti-reflection function from a separate coating layer and integrates it directly into the DOE structure through inclined portions. This eliminates the need for additional anti-reflection film layers, reducing device complexity and cost while maintaining improved optical utilization efficiency through the built-in gradual transition geometry.

The patent merges the diffraction function and anti-reflection function into a single integrated structure. The inclined portions simultaneously perform light diffraction and reduce interfacial reflection, eliminating the need for separate anti-reflection coatings and simplifying the overall device structure while improving optical efficiency.