Touch Screen Panel Poly-Crystalline ITO Resistance Reduction
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Solution Overview
Problem
Conventional capacitive touch screen panels face issues with high resistance in connection patterns and static electricity buildup, which affect the accuracy and reliability of touch input.
Innovation Solution
The touch screen panel incorporates poly-crystalline ITO first and second sensing cells with a thick amorphous ITO connection pattern, along with an island-shaped insulating layer and a low-resistance metal auxiliary pattern, to reduce resistance and static electricity, featuring a double-layered structure for the sensing cells and a specific fabrication method that transforms amorphous indium-tin-oxide into poly-crystalline indium-tin-oxide for enhanced conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capacitive touch screen panel uses thin connection patterns, then the device complexity is reduced, but the resistance of the connection pattern increases and static electricity builds up
Solution Approach 1:
The connection pattern uses a composite structure combining poly-crystalline ITO and amorphous ITO layers. The poly-crystalline ITO provides low resistance and static electricity dissipation, while the amorphous ITO layer enhances conductivity and reduces overall resistance, creating a composite material system that solves the resistance problem without requiring excessive structural complexity
Solution Approach 2:
The patent changes the physical and chemical parameters of the ITO material by controlling the crystallization process. By transforming amorphous ITO into poly-crystalline ITO through thermal treatment, the electrical conductivity and resistance characteristics are significantly improved, allowing for effective resistance reduction while maintaining manufacturing simplicity
2Reliability
If the connection pattern is made thicker to reduce resistance, then the resistance decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes in the material state during manufacturing. By depositing amorphous ITO and then transforming it to poly-crystalline ITO through thermal processing, the material's electrical properties are enhanced without requiring precise control of thick pattern dimensions. The phase transformation process naturally improves conductivity while maintaining manufacturing feasibility
Solution Approach 2:
The multi-layer composite structure of poly-crystalline and amorphous ITO allows for optimized electrical performance without excessive thickness. The combination of different ITO states provides both conductivity and structural integrity, reducing the need for manufacturing precision while achieving static electricity reduction
3Illumination intensity
If a double-layered sensing cell structure is implemented, then the transmittance is improved, but the device complexity increases
Solution Approach 1:
The patent employs a double-layered sensing cell structure where sensing electrodes are arranged in overlapping layers at different vertical positions. This three-dimensional arrangement allows light to pass through transparent regions while maintaining sensing functionality, effectively improving transmittance without significantly increasing lateral structural complexity
Solution Approach 2:
The sensing cells use composite ITO structures with poly-crystalline and amorphous layers that provide both optical transparency and electrical conductivity. This material composition enables the double-layered structure to maintain high light transmittance while delivering enhanced sensing performance
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 configuration decreases the resistance of the connection pattern, reduces static electricity, and enhances the sensitivity and reliability of the touch screen panel by minimizing electrostatic discharge (ESD) and improving transmittance.
Implementation Method 1
a fabrication method that transforms amorphous indium-tin-oxide into poly-crystalline indium-tin-oxide for enhanced conductivity
Implementation Method 2
a thick amorphous ITO connection pattern therebetween, thereby decreasing the resistance of the connection pattern
Implementation Method 3
a capacitive touch screen panel converts a contact position into an electrical signal by sensing a change in capacitance formed between a conductive sensing pattern and an adjacent sensing pattern
Data Source
AI summary
A touch screen panel includes a transparent substrate divided into a display area and a non-display area, the non-display area being outside the display area, first sensing cells disposed in one row with a same X-coordinate in the display area, the first sensing cells having a double-layered structure including first and second sensing cell parts overlapping each other, a connection portion between adjacent first sensing cells, second sensing cells disposed in one column with a same Y-coordinate in the display area, the second sensing cells having a double-layered structure including third and fourth sensing cell parts overlapping each other, a connection pattern between adjacent second sensing cells, the connection pattern intersecting and overlapping the connection portion, and an island-shaped insulating layer between the connection portion and the connection pattern.