Active-Matrix Substrate Static Electricity Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic thin-film transistors on flexible plastic boards are prone to dielectric breakdown due to static electricity, which can be caused by the insulating properties of plastic materials and the lower breakdown voltage of organic transistors compared to inorganic transistors.
Innovation Solution
The formation of an organic conductive material conduction portion between source lines and gate lines, which allows them to be equipotential, preventing electric fields and enabling the electrical connection to be broken through physical or chemical methods, such as dissolving with an organic solvent, to prevent dielectric breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If plastic materials are used for flexible boards, then flexibility and insulating properties are improved, but static electricity accumulation occurs causing dielectric breakdown
Solution Approach 1:
A conduction portion made of organic conductive material is introduced as an intermediary between the plastic board and the source/gate lines. This mediator allows controlled electrical connection during manufacturing to prevent static electricity accumulation, while being removable afterward to restore insulation. The conduction portion acts as a temporary bridge that resolves the contradiction between needing insulation and preventing static damage.
Solution Approach 2:
The conduction portion is formed in advance during the manufacturing process, before the device is completed. This preliminary action establishes a safe electrical connection that prevents static electricity damage during subsequent manufacturing steps. The conduction portion is then removed in a later step, leaving the final device with proper insulation and no static electricity vulnerability.
2Ease of manufacture
If organic conductive material is used for conduction portion, then ease of manufacture and cost are improved, but permanent conductivity may cause short circuit
Solution Approach 1:
The electrical conductivity of the conduction portion is made dynamic rather than static. The material transitions from a conductive state during manufacturing to an insulating state in the final product. This is achieved by using organic conductive material that can be selectively removed or deactivated, allowing the system to adapt its electrical properties according to the manufacturing stage.
Solution Approach 2:
The electrical conductivity parameter of the conduction portion is changed from conductive to insulating through chemical treatment or physical removal. The organic conductive material is designed to be soluble or removable under specific conditions, allowing control over its conductivity parameter. This parameter change resolves the contradiction by providing temporary conductivity for manufacturing ease while ensuring final reliability through removal.
3Ease of manufacture
If conduction portion is formed by printing, then manufacturing cost is reduced, but precision of electrical connection may be compromised
Solution Approach 1:
Traditional mechanical methods of forming precise electrical connections (such as photolithography and etching) are replaced with printing technology. The conduction portion is deposited using printing methods that can achieve sufficient precision for the application while significantly reducing manufacturing costs. The organic conductive material's properties allow printing to achieve acceptable connection precision where traditional methods would be too expensive.
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 approach effectively prevents dielectric breakdown due to static electricity, ensuring the active-matrix substrate functions reliably by maintaining the source and gate lines at the same potential and allowing for easy and reliable disconnection without damaging the board.
Implementation Method 1
forming a conduction portion that provides electrical connection between the source lines and the gate lines using an organic conductive material
Implementation Method 2
breaking the electrical connection provided by the conduction portion by dissolving and removing at least part of the conduction portion using an organic solvent
Data Source
AI summary
A method for producing an active-matrix substrate including a board, pixels, thin-film transistors that switch the pixels, and source lines and gate lines electrically connected to the thin-film transistors includes forming a conduction portion that provides electrical connection between the source lines and the gate lines using an organic conductive material at the same time as forming either the source lines or the gate lines; and breaking the electrical connection provided by the conduction portion.