Optical Element with Segmented Conductive Patterns for Stable Intermediate Viewing Mode

The patent divides the single planar conductive film structure into multiple independently controllable conductive patterns. Specifically, it uses a first transparent substrate with first conductive patterns and a second transparent substrate with second conductive patterns, allowing independent voltage application to each pattern. This segmentation enables different electrophoretic particle migration behaviors simultaneously, creating multiple operation modes (narrow viewing field mode, wide viewing field mode, and intermediate mode) without increasing overall device complexity.

The patent implements dynamic control of electrophoretic particle distribution by applying voltages to specific conductive patterns at specific times. To achieve and maintain intermediate mode, the first conductive patterns are activated while the second conductive patterns remain inactive (or vice versa). This dynamic, selective activation creates a stable intermediate state where particles are distributed in a controlled manner, allowing the system to switch between narrow, intermediate, and wide viewing field modes reliably.

The patent applies local quality control by creating different conductive patterns at different locations on the substrates. The first conductive patterns on the first substrate and second conductive patterns on the second substrate can be independently controlled. This allows different regions of the optical element to have different electrophoretic particle densities and distributions, enabling precise control over light transmission characteristics in each region and achieving multiple viewing field modes.