Thin-Film Transistor Insulating Layer Thickness Control
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Solution Overview
Problem
Existing display apparatuses face challenges in accurately controlling light emission and maintaining transistor characteristics due to issues with the formation of semiconductor layers on conductive layers, leading to potential electric field imbalances and defects during manufacturing.
Innovation Solution
A display apparatus is designed with a thin-film transistor (TFT) structure that includes a conductive layer and an insulating layer with specific thickness ratios, where the insulating layer is thinner than the buffer layer and the conductive layer, using materials like aluminum oxide or tin oxide to enhance semiconductor layer formation and mobility without causing electric field imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer is formed directly on the substrate before the semiconductor layer, then carrier mobility is improved, but electric field imbalance and manufacturing defects occur
Solution Approach 1:
An insulating layer is introduced as an intermediary between the conductive layer and the semiconductor layer. This insulating layer acts as a mediator that prevents direct contact while maintaining the beneficial electrical field effects of the conductive layer below, thereby improving carrier mobility without causing electric field imbalance or manufacturing defects.
2Manufacturing precision
If the insulating layer thickness is increased to prevent electric field imbalance, then manufacturing precision improves, but carrier mobility deteriorates
Solution Approach 1:
The thickness of the insulating layer is optimized to a specific range (30-50 Å) that balances two competing requirements: it is thick enough to prevent electric field imbalance and manufacturing defects, but thin enough to allow sufficient carrier mobility. This precise parameter control resolves the contradiction between manufacturing precision and device reliability.
3Reliability
If the insulating layer thickness is decreased to improve carrier mobility, then reliability improves, but manufacturing precision deteriorates
Solution Approach 1:
The insulating layer thickness is set to a minimum effective value (30-50 Å) that maintains electric field balance while allowing adequate carrier mobility. This parameter optimization ensures that the layer is thin enough to permit carrier transport but thick enough to prevent manufacturing defects and electric field imbalance.
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 allows for the uniform formation of semiconductor layers and improved mobility of carriers, preventing defects and ensuring accurate light emission control in the display apparatus.
Implementation Method 1
a thickness of the insulating layer is less than a thickness of the buffer layer... uniform formation of semiconductor layers... preventing defects
Implementation Method 2
improved mobility of carriers... conductive layer and an insulating layer sequentially located from the second barrier layer
Data Source
AI summary
A display apparatus and a method of manufacturing the same are provided. According to an embodiment, a display apparatus includes: a substrate; a thin-film transistor located on the substrate; and a buffer layer, a conductive layer, and an insulating layer sequentially located from the substrate between the substrate and the thin-film transistor, and a thickness of the insulating layer is less than a thickness of the buffer layer.