Electroactive Polymer Mirror Actuation for Dynamic Eye Box Expansion

The patent divides the single large MEMS mirror into multiple smaller sub-mirrors arranged in an array. Each sub-mirror can be independently driven, allowing the system to achieve both large effective area (when all sub-mirrors are active) and high driving speed (since each small sub-mirror responds quickly to actuation). This segmentation resolves the contradiction by enabling the system to function as both a large mirror and fast actuator simultaneously.

The patent implements dynamic control of the mirror array by selectively activating different subsets of sub-mirrors based on the required optical function. The system can dynamically reconfigure which sub-mirrors are active, allowing it to adapt between different operational modes that prioritize either area or speed depending on the specific task, thus resolving the static trade-off between these two parameters.

Instead of attempting to manufacture a single large MEMS mirror which becomes increasingly difficult and complex, the patent segments the mirror into multiple smaller, more manufacturable sub-mirrors. These sub-mirrors can be fabricated using standard MEMS processes and then arranged in an array, significantly reducing the manufacturing complexity while achieving the required total area through spatial arrangement rather than single-piece fabrication.

The patent creates a universal sub-mirror unit that can be replicated and arranged in different configurations to achieve various total areas and functional requirements. Each sub-mirror is designed with standardized dimensions and mounting interfaces, allowing them to be universally applied in different array configurations. This modularity reduces the complexity of scaling up mirror area, as one needs only to replicate proven sub-mirror designs rather than develop entirely new large-mirror fabrication processes.

The patent merges the eye box expansion function directly into the existing mirror array structure by using the same sub-mirrors that perform the primary optical function. The mirror array simultaneously serves as both the light-deflecting element and the eye box expansion mechanism, eliminating the need for a separate projection optical system. This integration reduces overall system complexity while achieving eye box expansion through the spatial arrangement and independent control of the sub-mirrors.

The patent makes the mirror array multi-functional by enabling it to perform both its primary optical function (light deflection and imaging) and the secondary function of eye box expansion. By independently controlling different subsets of sub-mirrors, the system can dynamically create multiple optical paths that expand the eye box while maintaining the primary imaging function, thus eliminating the need for dedicated eye box expansion hardware and reducing overall system complexity.