OLED TFT Shield Layer Structure for Parasitic Capacitance Control
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Solution Overview
Problem
In organic light-emitting display apparatuses, the luminance of sub-pixels can vary due to differences in received data signals, leading to deteriorated image quality.
Innovation Solution
Incorporating a shield layer between the data line and components of the thin-film transistor (TFT) and a storage capacitor structure with overlapping plates to stabilize the electric potential, thereby reducing parasitic capacitance and maintaining consistent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a data line is placed close to TFT components to transmit data signals, then signal transmission efficiency is improved, but parasitic capacitance increases causing luminance variation and image quality deterioration
Solution Approach 1:
A shield layer is introduced as an intermediary component between the data line and TFT components. This shield layer acts as a mediator that blocks electromagnetic interference and reduces parasitic capacitance coupling, allowing the data line to remain close to TFT components for efficient signal transmission while preventing harmful capacitive effects
2Device complexity
If the data line is positioned in the same layer as TFT components, then device complexity is reduced, but parasitic capacitance between the data line and TFT components increases
Solution Approach 1:
The shield layer is positioned in a different layer (vertical dimension) between the data line and TFT components. This dimensional separation allows the data line and TFT components to remain in the same horizontal layer for simplicity, while the shield layer in another dimension (vertical stacking) provides the necessary electrical isolation and parasitic capacitance reduction
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 layer and storage capacitor design ensure consistent luminance across sub-pixels, enhancing the overall image quality by minimizing the impact of varying data signals on TFT components.
Implementation Method 1
a shield layer between the data line and a component of the thin-film transistor
Implementation Method 2
a storage capacitor including a first storage capacitor plate and a second storage capacitor plate
Data Source
AI summary
A display apparatus includes: a thin-film transistor including a source electrode, a drain electrode, and a gate electrode; a data line in a layer different from the source electrode, the drain electrode, and the gate electrode, wherein the data line is configured to transmit a data signal; and a shield layer between the data line and a component of the thin-film transistor.