OGS Touch Sensor Glass Substrate Composition for Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The sensitivity of One Glass Solution (OGS)-mode touch sensors, which use a glass substrate with a fine metal wire touch electrode, is not sufficient due to the type of glass substrate used.
Innovation Solution
A touch sensor configuration with a glass substrate containing specific atoms like Si, Al, and K, along with a fine metal wire mesh pattern, and organic insulating layers to enhance sensitivity, where the Si content is 25.0% to 35.0% by mass, Al is 5.0% to 16.0% by mass, and K is 3.0% to 10.0% by mass, and the fine metal wire forms a mesh shape with a pitch of 400 to 1,200 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional glass substrates are used in OGS-mode touch sensors, then the structure is simple and easy to manufacture, but the sensitivity is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters of the glass substrate. Specifically, it sets the SiO2 content at 40-70 mass%, Al2O3 at 5-20 mass%, and B2O3 at 3-15 mass%, along with controlling the ratio of Al2O3 to (Na2O + K2O) between 0.5-2.0. These parameter adjustments optimize the glass substrate's properties to enhance touch sensor sensitivity while maintaining manufacturability.
Solution Approach 2:
The patent employs composite materials by creating a multi-component glass system that combines SiO2, Al2O3, B2O3, and alkali metal oxides in specific proportions. This composite glass composition leverages the synergistic effects of different materials to achieve improved sensitivity, where Al2O3 enhances mechanical strength and B2O3 contributes to chemical durability and network structure modification.
2Measurement precision
If the glass substrate composition is optimized for sensitivity, then touch detection performance improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for glass composition that balance performance and manufacturability. By defining SiO2 at 40-70 mass%, Al2O3 at 5-20 mass%, B2O3 at 3-15 mass%, and the Al2O3/(Na2O + K2O) ratio at 0.5-2.0, the patent creates a controlled parameter space that achieves high touch detection accuracy while remaining feasible for industrial manufacturing.
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 results in an OGS-mode touch sensor with improved sensitivity, allowing for more accurate touch detection and enhanced performance in touch panels.
Implementation Method 1
a first organic insulating layer having a relative dielectric constant of 3.0 or more between the glass substrate and the first touch electrode
Data Source
AI summary
A touch sensor includes a glass substrate having a touch surface and a first touch electrode formed of a fine metal wire formed on a surface of the glass substrate opposite to the touch surface, the glass substrate contains an Si atom, an Al atom, and a K atom, a content of the Si atom is 25.0% to 35.0% by mass with respect to the total mass of the glass substrate, a content of the Al atom is 5.0% to 16.0% by mass with respect to the total mass of the glass substrate, and a content of the K atom is 3.0% to 10.0% by mass with respect to the total mass of the glass substrate.