Thin Film Transistor Light Shielding Layer for OLED Stability
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Solution Overview
Problem
Oxide semiconductor materials used in thin film transistors for OLED displays are sensitive to external light, which can impact their performance and lead to failure.
Innovation Solution
Incorporating a light shielding layer in the same layer as the gate electrode but electrically unconnected, which blocks light from entering the active layer via the insulating layer, thereby reducing the adverse effects of external light on the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oxide semiconductor material is used for the active layer, then the thin film transistor can be fabricated with simpler processes and lower costs, but the active layer becomes sensitive to external light causing performance degradation and failure
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the external environment and the active layer. This layer blocks harmful light from reaching the light-sensitive oxide semiconductor material, thereby protecting the device reliability without affecting the manufacturing simplicity of using oxide semiconductors.
Solution Approach 2:
The patent converts the harmful effect of light sensitivity into a beneficial protective measure by adding a light shielding layer. The same light sensitivity that causes degradation is addressed by introducing a layer that selectively blocks light, thus transforming the vulnerability into an opportunity for enhanced device protection through targeted shielding.
2Reliability
If a light shielding layer is added to block light from the active layer, then the reliability of the thin film transistor is improved, but the device complexity increases
Solution Approach 1:
The light shielding layer is merged with the existing gate electrode layer structure. By forming the light shielding layer and gate electrode in the same layer sequence and using similar fabrication processes, the patent adds light shielding functionality without creating a completely separate complex structure, thus minimizing the increase in device complexity.
Solution Approach 2:
The gate electrode layer is given dual functionality: it serves both as the control electrode for the transistor operation and as a light shielding layer to protect the active layer. This multi-functionality reduces the need for additional dedicated light shielding structures, thereby limiting the increase in device complexity while maintaining improved reliability.
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 solution stabilizes the performance of the thin film transistors by preventing light from entering the active layer, resulting in more reliable OLED display performance.
Implementation Method 1
a light shielding layer which is configured to block light from entering the active layer via the insulating layer
Data Source
AI summary
A thin film transistor and a manufacturing method thereof, and an array substrate are disclosed. The thin film transistor includes a gate electrode, an insulating layer, an active layer and a source/drain electrode layer, and further includes a light shielding layer, and the light shielding layer is configured to block light from entering the active layer via the insulating layer, and the light shielding layer and the gate electrode are arranged in a same layer and electrically unconnected with each other. The thin film transistor can reduce the light irradiated to the active layer and thus reduce the adverse impact thus incurred.