Electro-optical Device Relay Electrode Noise Shielding
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Solution Overview
Problem
Variations in data line potentials cause noise that affects the gate node of driving transistors in electro-optical devices, leading to uneven luminance and decreased display quality, especially when storage capacitors are miniaturized.
Innovation Solution
The electro-optical device incorporates a first relay electrode formed in the same layer as the data line, surrounded on at least three sides by a power supply wiring line, which reduces noise invasion and stabilizes the potential of the driving transistor's gate electrode, ensuring consistent current supply to the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the storage capacitor is miniaturized to reduce pixel circuit area, then the pixel circuit area is reduced, but noise from data lines more easily affects the gate node causing luminance unevenness
Solution Approach 1:
A relay electrode is introduced as an intermediary component between the data line and the gate node of the driving transistor. This relay electrode serves as a buffer that blocks the direct path of noise transmission, thereby protecting the gate node from data line noise while allowing the storage capacitor to be miniaturized
Solution Approach 2:
The connection path between the data line and gate node is segmented into multiple sections by introducing the relay electrode. This segmentation creates distinct functional zones: the data line connection section, the relay electrode section (which blocks noise), and the gate node connection section, thereby isolating the sensitive gate node from noise
2Ease of manufacture
If the relay electrode is formed in the same layer as the data line, then the manufacturing process is simplified, but noise invasion from the data line to the gate electrode increases
Solution Approach 1:
The power supply wiring line is positioned between the relay electrode and the data line to serve as a noise barrier. This intermediary wiring structure blocks electromagnetic noise from the data line from reaching the relay electrode and gate node, while maintaining the simplicity of forming all conductors in the same layer
3Object-affected harmful factors
If the power supply wiring line surrounds the relay electrode on at least three sides, then noise shielding is improved, but the device complexity increases
Solution Approach 1:
The power supply wiring line is strategically positioned to surround the relay electrode on at least three sides, creating a localized noise barrier precisely where needed. This selective shielding approach provides effective noise protection while minimizing the overall wiring complexity and avoiding complete enclosure of the relay electrode
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 shields the gate electrode from data line noise, maintaining accurate luminance and improving display quality by controlling variations in the gate potential of the driving transistor.
Implementation Method 1
The first relay electrode is surrounded on at least three sides by the power supply wiring line
Data Source
AI summary
An electro-optical device includes a scanning line and a data line intersecting each other, a pixel circuit provided at a position corresponding to an intersection of the scanning line and the data line, and a power supply wiring line that supplies a given potential. The pixel circuit includes a light emitting element and a driving transistor configured to control a current flowing through the light emitting element. A gate electrode of the driving transistor is electrically connected via a first relay electrode to a given node. The first relay electrode is formed in the same layer as the power supply wiring line and the data line. The first relay electrode is surrounded on at least three sides by the power supply wiring line.