Doped Amorphous Silicon Conductive Layer for Static Discharge in Flexible Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display apparatuses are prone to defects due to static electricity, especially when flexible substrates with organic materials are folded or unfolded, leading to charge concentration and potential damage to components.
Innovation Solution
Incorporating a substrate with multiple insulating layers and a conductive layer made of doped amorphous silicon (a-Si) between organic and inorganic insulating layers, which disperses electric charges and reduces damage from static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate with organic materials is used, then the display apparatus can be folded/unfolded, but static electricity concentrates on bending portions causing component damage
Solution Approach 1:
A conductive layer made of doped amorphous silicon is introduced as an intermediary between the organic insulating layer and the inorganic insulating layer. This conductive layer acts as a mediator to discharge static electricity that accumulates in the organic layer, preventing charge concentration at bending portions and protecting thin film transistors from damage while maintaining substrate flexibility
Solution Approach 2:
The patent employs a composite structure combining organic insulating layers, inorganic insulating layers, and a conductive layer of doped amorphous silicon. This multi-material composite approach leverages the flexibility and insulation properties of organic materials while using the conductive silicon layer to manage static electricity, achieving both flexibility and reliability
2Reliability
If metal-based conductive layers are used to dissipate static electricity, then component protection is improved, but manufacturing complexity and equipment requirements increase
Solution Approach 1:
The patent changes the material parameter from metal to doped amorphous silicon for the conductive layer. This parameter change allows the conductive layer to be formed using existing semiconductor manufacturing processes such as low-pressure chemical vapor deposition (LPCVD) that are already used for forming semiconductor layers in thin film transistors, eliminating the need for additional metal deposition equipment while maintaining static electricity dissipation functionality
Solution Approach 2:
The doped amorphous silicon layer serves multiple functions: it provides conductivity to dissipate static electricity, acts as part of the insulating layer structure, and can be formed using the same manufacturing processes as the semiconductor layers in thin film transistors. This multi-functionality reduces manufacturing complexity and equipment requirements compared to using separate metal-based conductive layers
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 reduces static electricity-induced defects by dispersing electric charges, improving manufacturing efficiency without the need for additional equipment compared to metal-based conductive layers.
Implementation Method 1
a first conductive layer that includes amorphous silicon (a-Si) and that is disposed between the at least one organic insulating layer and the at least one inorganic insulating layer
Data Source
AI summary
A display apparatus that can reduce defects caused by static electricity, includes a substrate unit that includes at least one organic insulating layer, at least one inorganic insulating layer, and a first conductive layer that includes doped amorphous silicon (a-Si) that is disposed between the at least one organic insulating layer and the at least one inorganic insulating layer; and a thin film transistor unit disposed on the substrate portion and that includes a thin film transistor.