Touch Sensor Optical Adjusting Layer for Flexible Displays
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Solution Overview
Problem
Existing touch sensors face challenges in achieving both flexible and optical properties, particularly in thin, bendable display devices, where electrode patterns can degrade image quality and visibility due to refractive index differences between layers.
Innovation Solution
A touch sensor design featuring an optical adjusting layer with a refractive index closer to that of the electrode patterns, including protrusions and an insulation layer with a lower refractive index, which reduces transmittance and prevents electrode pattern visibility by minimizing refractive index differences between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode patterns are included in the touch panel to enable touch sensing, then touch detection function is improved, but image quality is degraded due to visible electrode patterns
Solution Approach 1:
An optical adjusting layer with refractive index matching the electrode pattern material is introduced as an intermediary between the electrode patterns and the surrounding environment. This layer masks the electrode patterns by eliminating refractive index differences, preventing light scattering and making the electrodes invisible while maintaining touch sensing functionality
Solution Approach 2:
The optical adjusting layer is selectively positioned only in regions where electrode patterns are present, providing local refractive index matching exactly where needed. This allows the electrode patterns to remain functional while being optically masked only in critical areas
2Length of moving object
If the display device is made thinner to achieve flexible properties, then flexibility and bendability are improved, but optical properties are degraded due to increased visibility of electrode patterns
Solution Approach 1:
The optical adjusting layer serves as a mediator that compensates for the increased visibility of electrode patterns in thin structures. By matching the refractive index of the electrode material, it prevents light scattering that would otherwise be more pronounced in thinner devices, thereby maintaining optical quality despite reduced thickness
3Ease of manufacture
If conventional insulation layers are used with refractive index matching the substrate, then manufacturing is simplified, but optical properties are degraded due to refractive index differences at the electrode pattern interfaces
Solution Approach 1:
The patent introduces a specialized optical adjusting layer with specific refractive index properties positioned locally at the electrode pattern interfaces, while the bulk insulation layer can maintain conventional substrate-matching refractive index. This localized approach optimizes optical properties where needed without complicating overall manufacturing
Solution Approach 2:
The optical adjusting layer can be formed using composite materials or specific material compositions that achieve the required refractive index matching with electrode patterns, combining optical performance requirements with manufacturing feasibility
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
Enhances optical properties such as transmittance and flexibility, ensuring improved image quality and user experience by reducing the visibility of electrode patterns in thin, flexible display devices.
Implementation Method 1
an optical adjusting layer interposed between the electrode patterns... the insulation layer having a refractive index less than that of the optical adjusting layer
Data Source
AI summary
A touch sensor includes a plurality of electrode patterns, an optical adjusting layer interposed between the electrode patterns, and an insulation layer at least partially covering the electrode patterns and the optical adjusting layer. The insulation layer may have a refractive index less than that of the optical adjusting layer.