Shielded TFT Display Layout for Uniform Sub-Pixel Luminance
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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
A display apparatus is designed with a thin-film transistor and a shield layer between the data line and the transistor components, along with a storage capacitor and initialization voltage line, to stabilize the electric potential and prevent parasitic capacitance, ensuring consistent luminance across sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a data line is placed close to thin-film transistor components to transmit data signals, then signal transmission efficiency is improved, but parasitic capacitance increases causing luminance deterioration
Solution Approach 1:
A shield layer is introduced as an intermediary component between the data line and the thin-film transistor components (gate electrode, source electrode, drain electrode). This shield layer acts as a mediator that blocks the harmful electromagnetic coupling and parasitic capacitance effects from the data line, while allowing the data signal transmission to proceed efficiently through the designated pathways.
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by introducing a dedicated shield layer that specifically targets and neutralizes the electromagnetic interference from the data line. The shield layer is electrically connected to a reference potential, effectively removing the harmful coupling effect while preserving the necessary signal transmission paths.
2Device complexity
If the data line is positioned in the same layer as transistor electrodes, then device complexity is reduced, but image quality deteriorates due to luminance variations
Solution Approach 1:
Instead of keeping the data line in the same layer as the transistor electrodes (2D planar arrangement), the invention introduces a vertical dimension by placing a shield layer between the data line and the transistor components. This multi-layer vertical stacking approach increases device complexity slightly but effectively isolates the data line from harmful electromagnetic coupling, ensuring uniform luminance across the display.
3Ease of manufacture
If no shield layer is used between data line and transistor components, then manufacturing process is simpler, but electrical potential stability deteriorates
Solution Approach 1:
A shield layer is introduced as an intermediary component between the data line and the thin-film transistor components (gate electrode, source electrode, drain electrode). This shield layer acts as a mediator that blocks the harmful electromagnetic coupling and parasitic capacitance effects from the data line, while allowing the data signal transmission to proceed efficiently through the designated pathways.
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 solution effectively maintains accurate luminance and improves image quality by reducing the impact of varying data signals on the transistor components, resulting in a more stable and higher-quality display.
Implementation Method 1
a shield layer between the data line and a component of the thin-film transistor
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.