Flexible Display Substrate Adhesion via ITO Reinforcing Layer
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Solution Overview
Problem
Flexible display devices face adhesion issues between glass substrates and flexible synthetic resin substrates due to poor adhesion characteristics, leading to potential detachment and contamination from impurities like oxygen and moisture.
Innovation Solution
A substrate section with a reinforcing layer of indium tin oxide (ITO) between the substrates, and a barrier layer structure using PECVD processes with varying SiH4 gas amounts to minimize adhesion loss and prevent impurity penetration, comprising a less dense first barrier layer and a more dense second barrier layer to enhance adhesion and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a glass substrate and flexible synthetic resin substrate are directly bonded, then the device structure is simple, but adhesion between substrates is poor leading to detachment
Solution Approach 1:
A reinforcing layer made of ITO (indium tin oxide) is introduced between the glass substrate and flexible synthetic resin substrate. This intermediary layer serves as an adhesion promoter that chemically or physically bonds to both substrates, creating a strong interface connection. The reinforcing layer acts as a mediator that resolves the adhesion incompatibility between glass and flexible resin, preventing detachment while maintaining structural simplicity.
2Object-affected harmful factors
If barrier layers are made highly dense to prevent impurity penetration, then protection against oxygen and moisture is improved, but adhesion between layers may be reduced
Solution Approach 1:
The barrier layer structure employs varying densities at different locations and depths. The first barrier layer has a lower density (less dense) while the second barrier layer has a higher density (more dense). This local quality variation allows the lower barrier layer to maintain good adhesion with the underlying layers, while the upper denser barrier layer provides superior protection against impurity penetration. Each layer performs its specific function optimally without compromising the other.
3Shape
If thick organic pixel defined layer and thick passivation layer are used for planarization, then surface flatness is improved, but device thickness increases
Solution Approach 1:
The patent replaces the conventional mechanical approach of using thick organic layers for planarization with an alternative method. Instead of relying on thick pixel defined layers and passivation layers to achieve surface flatness, the invention uses a different structural approach that maintains planarization while reducing overall device thickness. This substitution eliminates the need for excessive layer thickness to achieve the desired surface flatness.
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 increases adhesion between substrates, prevents detachment, and minimizes impurity penetration, ensuring the reliability and durability of flexible display devices.
Implementation Method 1
forming a first barrier layer configured to contact the reinforcing layer and to cover the second substrate, and a second barrier layer disposed above the first barrier layer, where the first barrier layer is less dense than the second barrier layer
Data Source
AI summary
A substrate section for a flexible display device is disclosed. The substrate section prevents adhesion loss between a reinforcing layer and a barrier layer, thereby preventing a peel-off phenomenon between an inorganic barrier layer and a reinforcing layer.