AMOLED Display Substrate Metal-Layer Layout for Narrow Frames
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Solution Overview
Problem
Existing active-matrix organic light-emitting diode (AMOLED) display panels face challenges in achieving narrow frames due to the arrangement of driving modules, which affect the panel's frame width.
Innovation Solution
The display substrate design includes multiple metal layers with specific electrode and signal line configurations, where electrodes of transistors and signal lines are arranged on different metal layers, allowing their orthographic projections to overlap partially, reducing the substrate width in certain directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving modules are arranged in the edge area to provide driving signals, then the display panel can function properly, but the frame width increases
Solution Approach 1:
The patent applies dimensionality change by arranging signal lines and transistor electrodes on different metal layers (vertical dimension) whose orthographic projections overlap in the planar dimension. This allows the driving module to maintain full functionality while reducing the horizontal frame width, as the signal transmission occurs in the vertical layer space rather than requiring additional horizontal space.
Solution Approach 2:
The patent implements nesting by placing the orthographic projection of signal lines within the orthographic projection area of transistor electrodes through multi-layer stacking. The signal lines are nested in the vertical space above or below the electrode plane, allowing both components to occupy the same horizontal footprint without interfering with each other's electrical functions.
2Device complexity
If signal lines and transistor electrodes are arranged on the same metal layer, then the layout is simpler, but the substrate width increases
Solution Approach 1:
The patent resolves this contradiction by transitioning from two-dimensional planar arrangement to three-dimensional multi-layer arrangement. Signal lines and transistor electrodes are placed on different metal layers, allowing their orthographic projections to overlap without physical interference. This vertical separation enables compact horizontal layout while maintaining electrical isolation through layer differentiation.
Solution Approach 2:
The patent segments the conductive elements into different metal layers, with signal lines on one layer and transistor electrodes on another layer. This segmentation allows independent optimization of each layer's layout and enables the orthographic projection overlap that reduces substrate width while preventing short circuits through vertical separation.
3Length of stationary object
If driving circuits are arranged compactly to reduce frame width, then the frame becomes narrower, but signal interference may increase
Solution Approach 1:
The patent eliminates signal interference concerns in compact layouts by utilizing vertical layer separation. Signal lines and transistor electrodes operate on different metal layers, allowing their orthographic projections to overlap for compact horizontal arrangement while the vertical spacing provides natural electrical isolation and reduces parasitic coupling between adjacent conductive elements.
Data Source
AI summary
A display substrate includes a driving module arranged on the base substrate, the driving module includes a plurality of driving units, and the driving unit includes a plurality of stages of driving circuits; the driving unit includes a first signal line, and the driving circuit includes an output sub-circuit; the display substrate includes at least two metal layers stacked along a direction away from the base substrate; in at least one driving unit, an orthographic projection of the first signal line on the base substrate at least partially overlaps an orthographic projection of a first electrode or a second electrode of at least one transistor included in the output sub-circuit on the base substrate, the first electrode and the second electrode are arranged on the same metal layer, and the first electrode and the first signal line are arranged on different metal layers.