Touch Electrode Air-Cavity Stack for Low-Noise OLED Displays
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Solution Overview
Problem
The accuracy of touch detection in electronic devices with touch panels is compromised due to increased noise from capacitance between touch electrodes and cathode electrodes, necessitating improved noise reduction techniques.
Innovation Solution
Incorporating an organic insulating layer with air cavities and hydrophobic layers to reduce permittivity, thereby minimizing capacitance and noise interference in touch-sensitive display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitance between touch electrode and cathode electrode is increased, then the touch signal strength is improved, but the noise from touch signal increases
Solution Approach 1:
The patent introduces an air cavity as an intermediary structure between the touch electrode and cathode electrode. This air cavity acts as a mediator that reduces the permittivity in the capacitance region, thereby reducing the noise generated by touch signals while maintaining sufficient touch signal strength for accurate detection.
Solution Approach 2:
The patent changes the permittivity parameter in the capacitance region by introducing air cavities. Since air has lower permittivity compared to traditional insulating materials, this parameter change reduces the capacitance between touch electrode and cathode electrode, thereby reducing noise while maintaining touch sensitivity.
2Stability of the object's composition
If traditional insulating materials are used between touch electrode and cathode electrode, then the structural integrity is maintained, but the noise from capacitance increases
Solution Approach 1:
The patent uses a composite structure combining organic insulating layers with air cavities. This composite approach maintains the structural integrity provided by organic insulating materials while incorporating air cavities that reduce permittivity and capacitance noise, achieving both structural stability and noise reduction.
Solution Approach 2:
The patent applies different properties to different regions: the organic insulating layers provide structural integrity and electrical insulation, while the air cavities provide noise reduction through lowered permittivity. This local differentiation allows each region to optimize its specific function without compromising the other.
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
Enhances touch detection accuracy and response time by reducing signal noise through the use of air cavities and hydrophobic layers, improving overall touch sensitivity.
Implementation Method 1
an organic insulating layer with air cavities that may reduce permittivity, thereby enhancing touch efficiency
Implementation Method 2
a hydrophobic layer disposed in the trenches and between the second inorganic insulating layer and the air cavities
Data Source
AI summary
A display device may include a substrate, a pixel circuit layer disposed on the substrate, a light-emitting-element layer disposed on the pixel circuit layer, and including light emitting elements, a first inorganic insulating layer disposed on the light-emitting-element layer, a first organic insulating layer disposed on the first inorganic insulating layer, and defining trenches in an area between the light emitting elements, a second inorganic insulating layer disposed on the first organic insulating layer, a second organic insulating layer disposed on the second inorganic insulating layer and capping the trenches, a plurality of touch electrodes disposed on the second organic insulating layer, and a plurality of air cavities defined by the trenches and the second organic insulating layer.