Subpixel Driver Layout With Bridge Electrode for Low-Resistance Current Paths
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Solution Overview
Problem
Existing display devices face challenges with high resistance in the lines through which driving currents flow, affecting the efficiency and performance of subpixels.
Innovation Solution
The display device incorporates a scan write line, scan initialization line, sweep signal line, first and second data lines, and subpixels connected to these lines, with pixel drivers and transistors configured to generate and control currents, and a bridge electrode connecting spaced electrodes of transistors to reduce resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional line configurations are used in display devices, then the structure is simple and easy to manufacture, but the resistance of the lines through which driving currents flow is high
Solution Approach 1:
The patent introduces a bridge electrode that extends in the second direction (vertical direction) to connect spaced-apart electrodes, adding a dimensional component to the electrical connection. This vertical bridging approach reduces horizontal line length and resistance while maintaining a relatively simple planar structure that can be integrated into existing display device architectures.
Solution Approach 2:
The bridge electrode serves as an intermediary element that connects the eighth transistor electrode and fifteenth transistor electrode which are spaced apart. This intermediate structure provides a low-resistance electrical path between the two electrodes, effectively reducing the overall line resistance without requiring a complete redesign of the entire electrical interconnection system.
2Reliability
If the length of lines carrying driving current is reduced, then resistance is reduced, but the layout complexity of the display device increases
Solution Approach 1:
The electrical connection path is segmented into multiple components: the eighth transistor electrode, the bridge electrode, and the fifteenth transistor electrode. This segmentation allows the connection to be made in discrete steps rather than requiring a single long continuous line, thereby reducing the total length of any individual current-carrying conductor while maintaining manufacturing feasibility through standardized fabrication processes.
Solution Approach 2:
By utilizing the vertical dimension (second direction) for the bridge electrode, the patent creates a three-dimensional electrical interconnection within a largely two-dimensional planar structure. This approach shortens the effective current path length without significantly increasing the planar footprint or complicating the overall device layout, as the bridge electrode can be formed as part of the standard multi-layer conductor structure.
Data Source
AI summary
A display device includes a scan write line configured to receive a scan write signal, a scan initialization line configured to receive a scan initialization signal, a sweep signal line configured to receive a sweep signal, a first data line configured to receive a first data voltage, a second data line configured to receive a second data voltage, and a subpixel connected to the scan write line, the scan initialization line, the sweep signal line, the first data line, and the second data line. The subpixel includes a light-emitting element, a first pixel driver including a first transistor configured to generate a control current according to the first data voltage of the first data line, and a second pixel driver including an eighth transistor configured to generate a driving current applied to the light-emitting element according to the second data voltage.