Multi-layer expanding electrode backplane for tiled displays
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Solution Overview
Problem
Conventional electro-optic displays require peripheral driver electronics, which create inactive areas when tiled together to form large area displays, resulting in incomplete optical activity across the viewing surface.
Innovation Solution
An electro-optic display with a backplane assembly featuring at least two electrode layers and an interposer layer, where a first electrode layer of a specific dimension drives a second electrode layer of a larger dimension, ensuring the entire viewing surface is optically active, and optionally including a third electrode layer for enhanced coverage and masking of underlying components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If peripheral driver electronics are used in conventional electro-optic displays, then the display can be driven and controlled, but inactive areas are created when displays are tiled together, resulting in incomplete optical activity across the viewing surface
Solution Approach 1:
The driver electronics are extracted from the peripheral areas and relocated to the center of the backplane assembly. The first electrode layer is configured with a smaller dimension than the second electrode layer, allowing the driver electronics to be positioned in the central region rather than occupying peripheral viewing areas. This extraction eliminates the inactive border areas that prevent complete optical activity when displays are tiled together.
Solution Approach 2:
The patent transitions from a conventional single-plane electrode structure to a multi-layer electrode architecture. By stacking the first electrode layer (with driver electronics) beneath the second electrode layer (with electro-optic material), the design moves driver electronics to a different spatial dimension (depth layer) rather than lateral periphery. This vertical arrangement allows the top viewing surface to be completely optically active while still providing space for driving electronics in the lower layer.
2Ease of manufacture
If the first electrode layer is made smaller to accommodate driver electronics, then driver integration is improved, but the viewing area coverage is reduced
Solution Approach 1:
The first electrode layer containing driver electronics is nested within the footprint of the second electrode layer. The smaller first electrode layer is positioned centrally and electrically connected to the larger second electrode layer through conductive structures. This nesting arrangement allows the driver electronics to be integrated within the overall display structure without reducing the top-level viewing area, as the larger second electrode layer extends beyond the first to provide full viewing surface coverage.
Solution Approach 2:
The patent resolves the area conflict by utilizing the vertical dimension through multiple electrode layers. The first electrode layer (smaller area) and second electrode layer (larger area) are stacked at different heights, with the larger second layer providing full viewing coverage at the top surface while the smaller first layer handles driver functions at a lower level. This dimensional separation allows both driver integration and full viewing area coverage to coexist without compromise.
Data Source
AI summary
The present invention provides for an electro-optic display having a backplane assembly with at least two electrode layers, a first electrode layer of a first dimension electrically connected to and driving a second electrode layer of a second dimension that is larger than the first dimension. The second electrode layer overlies the first electrode layer, such that the entire viewing area of an electro-optic display may be optically-active. The backplane assembly may have at least one interposer layer disposed between the two electrode layers to electrically connect the first and second electrode layers.