OLED Display Bridge Electrode Layout for Cross-Talk Reduction
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face issues with cross-talk due to parasitic capacitance between data lines and driving connectors, leading to luminance variations and reduced display quality.
Innovation Solution
Incorporating a bridge electrode and gate connectors separate from the data line to replace the driving connector, reducing parasitic capacitance by forming a bridge electrode on the substrate and connecting it to the gate electrodes through contact holes, thereby minimizing the impact of data line voltage variations on the driving transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving connector is used to connect the gate electrode to the data line, then electrical connection is achieved, but parasitic capacitance increases causing cross-talk
Solution Approach 1:
The patent extracts the driving connector from the system and replaces it with a bridge electrode structure. The bridge electrode is formed directly on the substrate and connects to the gate electrode through contact holes, eliminating the need for a separate driving connector and thereby removing the source of parasitic capacitance between the data line and the gate electrode connection structure.
Solution Approach 2:
The bridge electrode acts as an intermediary element between the substrate and the gate electrode. Instead of directly connecting the gate electrode to the data line through a driving connector, the bridge electrode provides an indirect connection path that reduces parasitic capacitance while maintaining electrical connectivity.
2Device complexity
If data line and driving connector are placed adjacent to each other, then routing is simplified, but cross-talk increases due to parasitic capacitance
Solution Approach 1:
The patent removes the driving connector from the adjacent routing structure and replaces it with a bridge electrode that is formed on the substrate and connects to the gate electrode through contact holes. This extraction eliminates the parasitic capacitance source while maintaining routing efficiency.
3Reliability
If driving connector is used, then gate electrode connection is achieved, but luminance consistency deteriorates due to voltage variations
Solution Approach 1:
The patent extracts the driving connector that causes voltage variations and replaces it with a bridge electrode structure. The bridge electrode provides a stable connection path with minimal parasitic capacitance, ensuring consistent voltage delivery to the gate electrode and maintaining luminance consistency across the display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces cross-talk, maintaining consistent driving current and luminance, and improving display quality by minimizing the influence of data line voltage variations on the driving transistor.
Implementation Method 1
cross-talk generated between a data line and a driving connector adjacent thereto is reduced
Data Source
AI summary
An exemplary embodiment provides an organic light emitting diode display including a substrate, a bridge electrode disposed on the substrate, a buffer layer which covers the bridge electrode, a semiconductor layer disposed on the buffer layer, a first gate insulating layer which covers the semiconductor layer in a plan view, a first gate conductor disposed on the first gate insulating layer and which includes a first gate electrode, a second gate insulating layer which covers the first gate conductor, a second gate conductor disposed on the second gate insulating layer, an interlayer-insulating layer which covers the second gate conductor, and a data line disposed on the interlayer-insulating layer. The first gate electrode is directly connected to the bridge electrode, the semiconductor layer is electrically connected to the bridge electrode, and a capacitance exists between the data line and the bridge electrode.