OLED Pixel Circuit Shield Wiring for Capacitive Noise Isolation
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Solution Overview
Problem
In electro-optical devices with Organic Light Emitting Diodes (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
The introduction of shield wires between data lines and driving transistors, which absorb noise before it reaches the driving transistor, thereby preventing degradation of display quality. The shield wires are positioned close to the data lines and connected to a constant potential to enhance noise absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the data line and driving transistor are placed close to each other for miniaturization and higher resolution, then the display resolution and device size 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 electromagnetic noise from the data line before it can couple through parasitic capacitance to the driving transistor, thereby protecting the transistor while maintaining the close proximity required for miniaturization and high resolution displays
2Object-affected harmful factors
If shield wires are positioned close to data lines to absorb noise, then noise absorption is improved, but device complexity increases
Solution Approach 1:
The shield wire is configured with specific parameters including being positioned closer to the data line than to the driving transistor, and being connected to a constant potential. By optimizing these parameters, effective noise absorption is achieved while minimizing the additional structural complexity introduced by the shield wire
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, ensuring stable display quality even in high-resolution and miniaturized OLED devices, preventing issues like crosstalk and garbled 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.