OLED Pixel Circuit Shield Wire Layout for Data Line Noise
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Solution Overview
Problem
In electro-optical devices with OLEDs, the miniaturization and higher resolution lead to increased capacitative coupling between data lines and driving transistors, causing potential fluctuations that degrade display quality due to noise propagation through parasitic capacitance.
Innovation Solution
Incorporating shield wires between data lines and driving transistors to absorb noise before it reaches the driving transistor, with the shield wires being positioned closer to the data lines than to the driving transistors and connected to a constant potential to enhance noise absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the data line and driving transistor are positioned close to each other for miniaturization and higher resolution, then the display resolution and compactness are improved, but noise propagates through parasitic capacitance causing display quality degradation
Solution Approach 1:
A shield wire is introduced as an intermediary element positioned between the data line and the driving transistor. The shield wire absorbs noise through capacitative coupling from the data line before the noise can reach the driving transistor, thereby protecting the pixel circuit while maintaining the close proximity needed for high resolution and miniaturization
2Reliability
If the shield wire is positioned closer to the data line than to the driving transistor, then noise absorption effectiveness is improved, but the layout complexity increases
Solution Approach 1:
The shield wire is positioned with non-uniform spacing: closer to the data line than to the driving transistor. This local quality variation optimizes noise absorption where it is most needed (near the noise source) while maintaining adequate isolation from the sensitive driving transistor, achieving effective noise suppression with a relatively simple layout
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 suppresses noise influence on the driving transistor, thereby maintaining display quality and preventing degradation, especially in high-resolution and miniaturized displays.
Implementation Method 1
the degree of capacitative coupling is increased. For this reason, when there is potential fluctuation of the data line, the potential fluctuation propagates to each portion of the driving transistor, especially to the gate as a kind of noise, through parasitic capacitance
Data Source
AI summary
An electro-optical device includes a scanning line, a data line intersecting with each other, a pixel circuit which is provided corresponding to the intersection thereof, and a wire. The pixel circuit includes a light emitting element, one transistor which controls a current flowing to the light emitting element, and the other transistor of which conduction state is controlled according to a scanning signal which is supplied to the scanning line between a gate node of the one transistor and the data line. The wire is provided between the data line and the one transistor.