Touch Panel Transparent Adhesive Layer Eliminates Newton's Rings
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Solution Overview
Problem
External light reflection at the interfaces between transparent electrodes in touch panels leads to visibility issues due to Newton's rings, caused by the gap between the upper and lower transparent electrode base members.
Innovation Solution
A touch panel design incorporating an insulating transparent adhesive layer with pressure-sensitive particles between the upper and lower transparent electrodes, which eliminates the air gap and establishes electrical conduction upon force application, reducing light reflection and preventing Newton's rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap is maintained between the upper and lower transparent electrode base members using spacers, then electrical conduction is prevented under normal conditions, but light reflection and Newton's rings occur at the interfaces
Solution Approach 1:
The patent removes the air gap between the upper and lower transparent electrode base members by replacing it with a transparent adhesive layer that fills the entire gap. This extraction of the harmful air interface eliminates light reflection and Newton's rings while maintaining electrical conduction control through the pressure-sensitive particles in the adhesive layer.
Solution Approach 2:
The transparent adhesive layer acts as an intermediary substance that fills the gap between the electrode base members. It serves dual functions: eliminating the harmful air interface to prevent light reflection, and providing a medium with pressure-sensitive particles that enable electrical conduction when pressure is applied, thus resolving the contradiction between maintaining gap and enabling conduction.
2Reliability
If spacers are used to maintain the gap between electrode base members, then electrical insulation is ensured, but the device complexity and component count increase
Solution Approach 1:
The patent merges the functions of electrical insulation and gap filling into a single transparent adhesive layer. This layer simultaneously provides insulation between the electrode base members and eliminates the need for separate spacer components, thereby reducing device complexity while maintaining insulation reliability.
Solution Approach 2:
The transparent adhesive layer performs multiple functions: it fills the gap between electrode base members, provides electrical insulation, eliminates light reflection interfaces, and contains pressure-sensitive particles for conduction control. This multi-functionality replaces multiple separate components (spacers, insulation layers, adhesive), significantly reducing component count and device complexity.
3Reliability
If an air gap is maintained between transparent electrodes, then electrical conduction is prevented, but visibility is reduced due to reflection and Newton's rings
Solution Approach 1:
The patent extracts and removes the air gap that causes harmful light reflection and Newton's rings. By replacing it with a transparent adhesive layer that has matching refractive index, the patent eliminates the optical interfaces that degrade visibility while maintaining controlled electrical conduction through the pressure-sensitive particle mechanism.
4Length of moving object
If the upper transparent electrode base member is made thin to reduce overall thickness, then the device becomes more compact, but it may bend easily affecting touch sensitivity
Solution Approach 1:
The patent uses a composite transparent adhesive layer containing pressure-sensitive particles dispersed in a transparent matrix. This composite material provides both structural support to maintain the thin electrode configuration and the necessary electrical conduction control when pressure is applied, allowing thin design without compromising stability or functionality.
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
The solution significantly improves visibility by reducing light reflection and enhancing the strength of the touch panel, allowing for a thinner design and reduced component count, while maintaining effective positional coordinate detection.
Implementation Method 1
when a force acts upon other surface of the upper transparent electrode base member, the acting force causes a current to flow among the pressure-sensitive particles in the transparent adhesive layer, whereby an electrical conduction is established between the upper transparent electrode and the lower transparent electrode
Implementation Method 2
the gap between the upper transparent electrode base member and the lower transparent electrode base member is filled with the transparent adhesive layer as a pressure-sensitive adhesive layer without any air layer. Therefore, the light reflection occurring at two interfaces, namely the interface between the upper transparent electrode base member and the air layer, and the interface between the air layer and the lower transparent electrode base member, can be suppressed
Data Source
AI summary
A gap between an upper transparent electrode base member and a lower transparent electrode base member is filled with a transparent adhesive layer as a pressure-sensitive adhesive layer, to eliminate an air layer.