Clad Layer Protects Low-K Interlayer Insulation in OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED displays face issues with acid resistance and surface non-uniformity in the interlayer insulation layer, leading to defects and potential loss of electrodes when cleaned with solutions like hydrogen fluoride, which affects the integrity and performance of the display device.
Innovation Solution
A display device is designed with a low dielectric constant interlayer insulation layer covered by a clad layer made of silicon oxide or silicon nitride, which has high acid resistance, minimizing damage from cleaning solutions and ensuring electrode integrity by forming a strong bond with the sealant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a low dielectric constant material is used for the interlayer insulation layer to minimize parasitic capacitance, then signal transmission speed is improved, but acid resistance deteriorates and surface uniformity is compromised when cleaned with hydrogen fluoride
Solution Approach 1:
The patent uses a composite structure where the interlayer insulation layer (low dielectric constant material) is combined with a clad layer (silicon oxide or silicon nitride) that provides acid resistance. This composite approach allows the system to simultaneously achieve low parasitic capacitance for fast signal transmission and high acid resistance for reliable cleaning processes.
2Speed
If a low dielectric constant material is used for the interlayer insulation layer to minimize parasitic capacitance, then signal transmission speed is improved, but surface uniformity deteriorates when cleaned with hydrogen fluoride
Solution Approach 1:
The clad layer acts as an intermediary protective layer between the hydrogen fluoride cleaning solution and the interlayer insulation layer. This mediator layer prevents direct contact between the cleaning solution and the low dielectric constant material, thereby maintaining surface uniformity while allowing the interlayer insulation layer to retain its low parasitic capacitance properties.
3Ease of manufacture
If the interlayer insulation layer is cleaned with hydrogen fluoride to remove defects, then cleaning effectiveness is improved, but electrode integrity deteriorates due to surface non-uniformity
Solution Approach 1:
The clad layer is formed beforehand to cushion or protect the interlayer insulation layer from the harmful effects of hydrogen fluoride cleaning. This protective layer allows effective cleaning to occur while preventing the cleaning solution from directly damaging the electrode structures, thereby maintaining electrode integrity.
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 defects and damage to the interlayer insulation layer, maintains electrode integrity, and enhances the display device's impact resistance and image quality by minimizing parasitic capacitance and signal speed reduction.
Implementation Method 1
a dielectric constant of the interlayer insulation layer being less than a dielectric constant of the gate insulation layer
Implementation Method 2
a clad layer disposed on the interlayer insulation layer... which has high acid resistance, minimizing damage from cleaning solutions
Data Source
AI summary
A display device includes a substrate, an active layer, a gate insulation layer, a gate electrode, an interlayer insulation layer, a clad layer, a source electrode, and a drain electrode. The active layer is disposed on the substrate. The gate insulation layer is disposed on the active layer. The gate electrode is disposed on the gate insulation layer. The interlayer insulation layer is disposed on the gate electrode. A dielectric constant of the interlayer insulation layer is less than a dielectric constant of the gate insulation layer. The clad layer is disposed on the interlayer insulation layer. The source and drain electrodes are disposed on the clad layer.