Single Metal Layer Display with Segmented Column Lines
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Solution Overview
Problem
The existing manufacturing processes for flat-panel displays are costly and complex due to the need for multiple photolithographically defined layers, which increases production expenses, especially for large displays requiring tight tolerances.
Innovation Solution
A single metal layer display technology that uses a patterned metal layer on the substrate to provide all necessary electrical connections and control signals, with micro-transfer printing of electrical jumpers and pixel circuits to form a two-dimensional array of column line segments and one-dimensional arrays of row lines, reducing the number of layers and manufacturing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple photolithographically defined layers are used to provide electrical connections and control signals, then electrical isolation between row and column lines is achieved, but manufacturing cost and process complexity increase significantly
Solution Approach 1:
The patent combines row lines and column lines into a single photolithographically defined metal layer, eliminating the need for separate layers. Electrical isolation is achieved through geometric routing and spacing within the same layer rather than physical layer separation, thus reducing the total number of layers while maintaining functional isolation.
Solution Approach 2:
The single metal layer performs multiple functions simultaneously: it provides both row and column conductors, enables electrical isolation through design geometry, and facilitates pixel addressing. This multi-functional approach eliminates the need for dedicated separate layers for each function.
2Manufacturing precision
If multiple photolithographic steps are performed to define conductive wires and thin-film circuits, then precise electrical connections are established, but manufacturing cost and production time increase
Solution Approach 1:
The patent segments the conductor patterns within the single metal layer to distinguish between row lines and column lines, using geometric arrangements and spacing to define their functions. This segmentation allows precise electrical connections to be established through a single photolithographic step rather than multiple sequential steps.
3Reliability
If row lines and column lines are formed in separate layers, then electrical isolation is maintained, but the manufacturing process becomes more expensive and complex
Solution Approach 1:
The patent merges row lines and column lines into a single metal layer, using planar geometric routing and spacing to maintain electrical isolation. This approach simplifies the manufacturing process by reducing the number of deposition and patterning steps while achieving the same electrical isolation function through design rather than structural separation.
Data Source
AI summary
A single metal layer device, such as a display or sensor, comprises a substrate and a patterned metal layer. The patterned metal layer forms a two-dimensional array of spatially separated column line segments that each extend only partially across the display substrate in a column direction and forms a one-dimensional array of row lines extending across the display substrate in a row direction different from the column direction. The row lines and column line segments are electrically separate in the patterned metal layer. Spatially separated electrical jumpers are disposed on the display substrate and electrically connect pairs of column line segments adjacent in the column direction. Each electrical jumper has an independent jumper substrate independent of and separate from the display substrate. In certain embodiments, spatially separated light-emitting pixel circuits are disposed on a display substrate and are electrically connected to at least one row line and one column line.