Top-Gate TFT Array Substrate Barrier Layout Against Moisture and Light
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Solution Overview
Problem
Thin film transistors with top gate structures are vulnerable to water and oxygen permeation and direct light irradiation, which affects their performance and reduces their weather resistance.
Innovation Solution
An array substrate is designed with a barrier layer placed above the active layer, covering the exposed areas between the gate and source-drain metal sub-layers, thereby blocking water, oxygen, and light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a top gate structure is used to achieve higher carrier mobility and lower leakage current, then device performance is improved, but the active layer becomes vulnerable to water and oxygen permeation and direct light irradiation
Solution Approach 1:
A barrier layer is introduced to cover the active layer in the region between the gate electrode and source-drain electrodes. This thin film structure physically blocks water, oxygen, and light from reaching the active layer, preventing degradation while maintaining the top gate structure's electrical performance advantages.
Solution Approach 2:
The barrier layer acts as an intermediary protective element between the active layer and the harmful external environment (water, oxygen, light). It mediates the interaction by providing a protective interface that prevents direct contact between the active layer and harmful factors without interfering with the electrical function of the transistor.
2Device complexity
If the active layer is exposed between gate and source-drain electrodes, then device structure is simplified, but weather resistance deteriorates
Solution Approach 1:
The barrier layer is implemented as a thin film that conforms to the device structure, covering only the necessary exposed regions of the active layer. This approach provides comprehensive protection without significantly increasing device complexity, as the barrier layer can be integrated into the existing manufacturing process.
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 barrier layer effectively enhances the weather resistance of thin film transistor devices by preventing permeation and direct irradiation, thereby maintaining device performance.
Implementation Method 1
the barrier layer not only plays a role in blocking water and oxygen
Implementation Method 2
but also blocks direct irradiation of light to the active layer at the active layer exposed area
Data Source
AI summary
An array substrate and a manufacturing method thereof are provided. The array substrate includes a substrate, an active layer, a first insulating layer, a first metal layer, a second insulating layer, and a second metal layer. The array substrate includes a thin film transistor (TFT) area, and the second metal layer includes a source-drain metal sub-layer located in the TFT area. The TFT area is defined with an active layer exposed area. The array substrate includes a barrier layer, and an orthographic projection of the barrier layer on the active layer at least partially covers an orthographic projection of the active layer exposed area on the active layer.