Display Substrate Bezel Trace Design for Short-Circuit Prevention
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Solution Overview
Problem
In the manufacturing of touch signal wires for flexible multi-layer on cell (FMLOC) technology, metal residue at the grooves between barrier dams can cause short-circuits, affecting touch performance due to overlapping trace projections and deep grooves.
Innovation Solution
A display substrate design with a specific arrangement of metal layers, insulation layers, and trace portions, where the ratio of line distance to line width of trace portions is optimized to prevent short-circuits and accommodate a narrow bezel design, including a bridge metal layer and touch electrode layer with strategically placed first and second grooves and via holes to minimize metal residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If trace portions are arranged to span overlapping grooves between barrier dams and metal leads, then narrow bezel design is achieved, but metal residue causes short-circuits between adjacent traces
Solution Approach 1:
The patent applies local quality by making the trace portions narrower specifically at the regions spanning the overlapping grooves, while maintaining adequate width in other regions. This localized dimension adjustment allows traces to cross the groove overlap area without causing short-circuits from metal residue, while still achieving the narrow bezel design goal.
Solution Approach 2:
The patent changes the line width parameter of the trace portions at critical locations where they span overlapping grooves. By reducing the line width at these specific positions, the patent prevents short-circuits while maintaining the overall narrow bezel design. This parameter adjustment is applied locally rather than uniformly across all traces.
2Adaptability or versatility
If multiple metal layers with signal wires are arranged in the bezel region, then functionality is enhanced, but complexity of manufacturing increases
Solution Approach 1:
The patent utilizes the vertical dimension by arranging multiple metal layers (first metal layer, second metal layer, bridge metal layer) at different heights. This multi-layer stacking approach enables enhanced signal wire functionality and routing flexibility while managing the complexity through systematic layer organization rather than planar expansion.
Solution Approach 2:
The patent segments the signal wire structure into multiple independent metal layers, each with specific functions. The first metal layer contains signal wires, the second metal layer contains additional signal wires, and the bridge metal layer connects them. This segmentation allows for specialized manufacturing processes for each layer and simplifies the overall manufacturing complexity through modular construction.
Data Source
AI summary
A display substrate and a display device. The display substrate includes a base substrate, at least two first metal layers insulated from each other, at least two barrier dams and at least one second metal layer are sequentially arranged on the base substrate, and the base substrate includes a display region and a bezel region on at least one side of the display region. In the bezel region, the at least two barrier dams are arranged around the display region, and a first groove is provided between adjacent barrier dams; each first metal layer includes a plurality of first leads, a second groove is provided between adjacent first leads, and orthographic projections of at least some of the second grooves overlap orthographic projections of the first grooves; and the second metal layer includes a plurality of first signal wires.