Pixel Circuit Shield Wire Layout for Data Line Noise Suppression
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Solution Overview
Problem
In electro-optical devices with miniaturized displays and high resolution, potential fluctuations on data lines cause noise that degrades display quality by affecting the holding potential of driving transistors, leading to undesired current flow in light emitting elements.
Innovation Solution
The integration of shield wires between data lines and driving transistors in the pixel circuit design, which absorb noise before it reaches the driving transistor, is implemented to prevent potential fluctuations from degrading display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the data line and driving transistor are placed close to each other for miniaturization, then the display size is reduced and resolution is improved, but noise from potential fluctuation propagates through parasitic capacitance degrading display quality
Solution Approach 1:
A shield wire is introduced as an intermediary component between the data line and the driving transistor. The shield wire absorbs noise from potential fluctuation before it reaches the driving transistor through parasitic capacitance, thereby protecting the pixel circuit while maintaining the close proximity required for miniaturization and high resolution
2Object-affected harmful factors
If the shield wire is placed closer to the data line, then noise absorption is improved, but the area of the pixel circuit increases
Solution Approach 1:
The shield wire is positioned selectively closer to the data line in specific regions where noise coupling is most severe, particularly near the driving transistor gate. This localized positioning optimizes noise absorption effectiveness while minimizing the additional area occupied by the shield wire structure
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
The shield wires effectively mitigate noise interference, ensuring stable current flow to the light emitting elements and maintaining display quality by reducing the influence of parasitic capacitance.
Implementation Method 1
the degree of capacitative coupling is increased... 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.