Thin Film Transistor Contact Hole Formation via Supporting Layer
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Solution Overview
Problem
The challenge lies in forming fine and uniform contact holes on a substrate for organic light-emitting display apparatuses without damaging insulating layers, which is crucial for improving display quality and increasing the number of elements for high-resolution displays.
Innovation Solution
A thin-film transistor array substrate is designed with a specific structure including a substrate, active layers, insulating layers, and supporting layers, where the contact holes are defined through the insulating layers using a method that involves etching and a mask pattern process to prevent damage to the insulating layers, allowing for precise formation of fine contact holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of contact holes is increased to achieve high resolution, then display quality is improved, but the difficulty of forming fine and uniform contact holes without damaging insulating layers increases
Solution Approach 1:
The supporting layer is formed in advance at the bottom of the contact hole before etching the insulating layers. This preliminary structure prevents the etching process from damaging the insulating layers while enabling the formation of fine and uniform contact holes, thus resolving the contradiction between manufacturing precision and harmful factors.
Solution Approach 2:
The supporting layer acts as a cushioning structure formed beforehand at the bottom of the contact hole. It protects the insulating layers from etching damage by providing a physical barrier, allowing the etching process to proceed without harming the insulating layers while maintaining contact hole uniformity and precision.
2Manufacturing precision
If the size of elements is reduced to increase the number of elements, then high resolution is achieved, but the risk of short-circuits increases
Solution Approach 1:
The supporting layer is formed in advance to define the bottom of the contact hole before etching. This preliminary structure ensures precise contact hole formation with controlled dimensions, preventing short-circuits while enabling reduced element sizes for high resolution displays.
Solution Approach 2:
The supporting layer acts as an intermediary structure between the insulating layers and the contact hole. It mediates the etching process by providing a protective barrier, ensuring that contact holes are formed with precise dimensions that prevent short-circuits while maintaining the reliability of the device.
3Ease of manufacture
If conventional etching methods are used to form contact holes, then the process is simple, but insulating layers are damaged
Solution Approach 1:
The supporting layer is formed in advance before the etching process. This preliminary structure protects the insulating layers from etching damage while maintaining a relatively simple manufacturing process, as the supporting layer formation integrates with existing manufacturing steps.
Solution Approach 2:
The supporting layer serves as an intermediary protective structure during the etching process. It allows conventional etching methods to be used while preventing damage to the insulating layers, thus maintaining ease of manufacture without compromising the integrity of the insulating layers.
Data Source
AI summary
A thin-film transistor array substrate includes a substrate; a first active layer of a first transistor, which is on the substrate and includes a source region, a channel region, and a drain region; a conductive layer, which is on the first active layer and is electrically connected to the source region or the drain region via a contact hole; a first insulating layer and a second insulating layer, which are between the first active layer and the conductive layer, where the contact hole is defined through the first and second insulating layers; and a first supporting layer, which is between the first insulating layer and the second insulating layer and surrounds at least a portion of the contact hole.