Touch Screen Panel Sensing Patterns for Parasitic Capacitance Reduction
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Solution Overview
Problem
Existing touch screen panels with capacitive sensing types face sensitivity issues due to high parasitic capacitance and vulnerability to static electricity, as the first and second sensing patterns are formed on different layers with large overlapping areas and high resistance materials.
Innovation Solution
The touch screen panel integrates first and second sensing cells on the same level with low resistance metal connection parts and a conductive protective layer, along with an insulating layer in an island shape to reduce parasitic capacitance and electrostatic discharge, and auxiliary patterns to prevent static electricity damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If sensing patterns are formed on different layers with large overlapping areas, then the structural stability is improved, but the parasitic capacitance increases and sensing sensitivity deteriorates
Solution Approach 1:
The patent transitions from a three-layer structure (sensing patterns on different layers) to a planar structure (sensing patterns on the same layer), effectively changing the dimensional arrangement to eliminate vertical overlap while maintaining horizontal connectivity through insulating layers
2Illumination intensity
If transparent conductive material is used for sensing patterns, then the transparency is improved, but the surface resistance increases
Solution Approach 1:
The patent employs a composite structure where transparent conductive material forms the sensing patterns and metal materials form the connection patterns, combining the transparency advantage of TCO with the low resistance advantage of metal to achieve both transparency and low surface resistance
3Device complexity
If connection patterns are disposed on the upper portion of the insulating layer, then the manufacturing complexity is reduced, but the vulnerability to static electricity increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the sensing patterns and the connection patterns, providing electrostatic protection to the sensing patterns while maintaining electrical connectivity where needed, thus reducing vulnerability to static electricity without significantly increasing manufacturing complexity
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 enhances sensing sensitivity and reduces the risk of electrostatic discharge, improving the operational reliability and accuracy of the touch screen panel.
Implementation Method 1
an overlapping area of each connection part disposed on the upper and lower layers becomes large and the capacity for parasitic capacitance accordingly becomes large
Implementation Method 2
it is vulnerable to static electricity applied or occurring from the outside
Data Source
AI summary
A touch screen panel including: a transparent substrate that incorporate a display region and a non-display region; first sensing patterns that are arranged in a first direction and include first sensing cells and first connection parts; second sensing patterns that are arranged in a second direction and include second sensing cells and second connection parts; an insulating layer that is formed on each of the second connection parts in an island shape; the second sensing cells contact the ends of exposed second connection parts; a plurality of first sensing cells that are arranged on the display region in the first direction intersecting with the second direction; connection parts that connect the adjacent first sensing cells to each other; and metal patterns that are formed in the non-display region and are connected to each of the sensing cells disposed at the ends of the display region.