Moisture-Resistant Touch Sensor Panel Laminate for Stable Recognition
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Solution Overview
Problem
Touch sensor panels in image display devices face issues with poor drive performance and visibility in high-temperature and high-humidity environments due to moisture exposure, leading to inaccurate touch recognition and visibility problems.
Innovation Solution
A touch sensor panel design incorporating a base layer with a low water vapor transmission rate, a patterned conductive layer, and a first insulating layer with specific thickness and toughness ratios, along with a support layer and refraction index adjustment layer, to minimize moisture impact and maintain accurate touch recognition and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor panel is used in high-temperature and high-humidity environments, then the device can operate in various environments, but moisture penetration causes poor drive performance and visibility issues
Solution Approach 1:
The patent introduces a base layer as an intermediary barrier between the moisture environment and the touch sensor layer. This base layer with specifically controlled water vapor transmission rate acts as a mediator that protects the sensitive conductive patterns from moisture while allowing the device to operate in high-humidity environments
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including a base layer, touch sensor layer, and insulating layer. Each layer is designed with specific material properties to collectively resist moisture penetration while maintaining touch sensitivity and visibility, creating a composite barrier system
2Reliability
If the base layer and insulating layer have low water vapor transmission rates, then moisture penetration is suppressed, but the device structure becomes more constrained
Solution Approach 1:
The patent specifies precise parameter ranges for the water vapor transmission rates of the base layer (Pc ≤ 900 g/(m2·24 hr)) and insulating layer (Pa ≤ 900 g/(m2·24 hr)). By controlling these parameters within defined thresholds, the patent achieves effective moisture protection without requiring excessively complex or thick barrier structures
3Manufacturing precision
If the patterned conductive layer is made visible for inspection, then manufacturing quality can be monitored, but visibility issues occur in high-humidity environments
Solution Approach 1:
The patent provides a first insulating layer that covers the patterned conductive layer beforehand, creating a protective cushion that prevents moisture from directly contacting the conductive patterns. This pre-established protection layer maintains the optical appearance and prevents visibility degradation before moisture damage can occur
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 design effectively suppresses poor drive performance and visibility issues in high-temperature and high-humidity environments, ensuring reliable touch recognition and maintaining patterned conductive layer visibility, while also enhancing bendability for flexible display applications.
Implementation Method 1
a water vapor transmission rate Pc of the base layer at a temperature of 40° C. and a humidity of 90% RH is not higher than 900 g/(m2•24 hr), and a water vapor transmission rate Pa of the first insulating layer at a temperature of 40° C. and a humidity of 90% RH is not higher than 900 g/(m2•24 hr)
Data Source
AI summary
A touch sensor panel includes a base layer, a touch sensor layer, and a first insulating layer in this order. The touch sensor layer includes a patterned conductive layer. A water vapor transmission rate Pc of the base layer at a temperature of 40° C. and a humidity of 90% RH is not higher than 900 g/(m2•24 hr). A water vapor transmission rate Pa of the first insulating layer at a temperature of 40° C. and a humidity of 90% RH is not higher than 900 g/(m2•24 hr).