Touch Screen Panel Auxiliary Patterns Reduce Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitance type touch screen panels face issues with high sheet resistance in touch sensing electrodes and decreased transmittance due to the use of materials like ITO, leading to reduced touch sensitivity and visibility problems.
Innovation Solution
A touch screen panel design incorporating sensing patterns with first and second directions, bridge electrodes, and auxiliary patterns that satisfy a specific ratio equation, optimizing line width, thickness, and length to reduce resistance while maintaining transmittance, using materials like molybdenum, silver, or gold for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO or conductive polymer is used as touch sensing electrode material, then transmittance is maintained, but sheet resistance becomes high leading to reduced touch sensitivity
Solution Approach 1:
The patent uses a composite structure combining transparent conductive oxide (ITO) layer with metal bridge electrodes (silver, aluminum, or copper). This composite approach allows the ITO to provide transmittance while the metal bridge electrodes provide low resistance, achieving both optical clarity and electrical conductivity.
Solution Approach 2:
The patent introduces bridge electrodes that extend in the vertical dimension (Z-axis) connecting ITO patterns at different positions. This dimensional approach creates additional conductive pathways through the stack structure, reducing overall sheet resistance without compromising the transmittance properties of the ITO layers.
2Reliability
If bridge electrodes are used to connect separated unit patterns, then conductivity is improved, but transmittance of the touch screen panel decreases
Solution Approach 1:
The bridge electrodes are strategically positioned only at specific locations where unit patterns need electrical connection, rather than forming continuous large-area structures. This localized approach provides necessary conductivity pathways while minimizing the overall area occupied by non-transparent elements, thus preserving panel transmittance.
Solution Approach 2:
The electrode structure is segmented into discrete ITO patterns connected by separate bridge electrodes. This segmentation allows each component to be optimized independently - ITO patterns for transmittance and bridge electrodes for conductivity - rather than requiring a continuous thick electrode layer that would compromise optical properties.
3Reliability
If auxiliary patterns are added to reduce resistance, then touch sensitivity improves, but device complexity increases
Solution Approach 1:
The auxiliary patterns are merged with the existing ITO and bridge electrode structures to form an integrated electrode system. Rather than adding completely separate components, the auxiliary patterns are incorporated into the same fabrication process and material layers, reducing overall device complexity while achieving the resistance reduction goal.
Solution Approach 2:
The auxiliary patterns serve multiple functions: they provide additional conductive pathways to reduce resistance, maintain electrical connection between adjacent unit patterns, and work cooperatively with the bridge electrodes. This multi-functionality reduces the need for separate dedicated components for each function.
Data Source
AI summary
Disclosed is a touch screen panel including: a touch sensing electrode; and a pixel part disposed on a bottom of the touch sensing electrodes, wherein the touch sensing electrode includes: sensing patterns which include first patterns formed in a first direction and second patterns formed in a second direction; bridge electrodes which electrically connect separated unit patterns of the second patterns; and at least one auxiliary pattern which is provided on a top or a bottom of at least one of the first patterns and second patterns, the pixel part includes a plurality of unit pixels, and the auxiliary patterns respectively satisfy Equation 1, thereby having excellent touch sensitivity due to significantly decreased resistance of a touch screen panel.