Composite Substrate Moisture Barrier for Thin Touch Displays

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Solution Overview

Problem

Existing touch display devices face challenges in thinning while maintaining multiple functions, as the addition of moisture barrier layers and other components increases the overall thickness.

Innovation Solution

The use of a composite substrate with a moisture barrier layer provides a thin, effective solution by integrating the touch electrode and other elements onto this substrate, eliminating the need for additional moisture barrier films and reducing device thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple functional components are bonded together to achieve multi-functionality, then the device can perform multiple functions, but the overall thickness of the product increases

Engineering Contradiction:

Improvemulti-functionalityVSAvoidproduct thickness

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent combines the moisture barrier layer and support layer into a single composite substrate structure. The moisture barrier layer is integrated directly with the support layer, eliminating the need for separate moisture barrier films and reducing the overall number of bonded components, thereby achieving multi-functionality (structural support + moisture protection) while minimizing thickness increase

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The composite substrate serves multiple functions simultaneously: it provides structural support, acts as a moisture barrier, and serves as a base for mounting electronic components. By designing the substrate to fulfill multiple roles, the patent reduces the need for additional separate components that would increase thickness

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a moisture barrier layer is added to protect against moisture, then moisture protection is improved, but the device thickness increases

Engineering Contradiction:

Improvemoisture protectionVSAvoiddevice thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The moisture barrier layer is merged with the support layer to form a composite substrate. This integration eliminates the need for additional separate moisture barrier films, providing effective moisture protection (with moisture transmission rate less than 1×10^-2 g/m2/day) while minimizing the increase in device thickness

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses a composite substrate comprising a support layer and a moisture barrier layer. This composite structure provides enhanced moisture protection compared to single-layer materials, while the optimized composition and structure of the composite allow for thin-film implementation that does not significantly increase overall device thickness

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12282635B2Touch display device with moisture barrier layer embedded composite substrate

Publication Date: 2025.04.22 E INK HLDG INC

AI summary

A touch display device includes a substrate, a display element layer, a composite substrate, a touch electrode and an adhesive layer. The display element layer is disposed on the substrate. The composite substrate includes a support layer and a moisture barrier layer. The moisture barrier layer is in direct contact with and covers a surface of the support layer. The display element layer is located between the substrate and the composite substrate. A moisture transmission rate of the moisture barrier layer is less than 1×10−2 g/m2/day. The touch electrode is disposed on the composite substrate. The adhesive layer is disposed between the display element layer and the composite substrate.