Bent Window Edge Sealing for Moisture Resistance in Touch Displays

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Solution Overview

Problem

Display devices with touch input systems are vulnerable to external moisture due to exposed edges after laser cutting, leading to defects and reduced lifespan.

Innovation Solution

A display device design featuring a window with a bent end to seal the touch screen panel, combined with adhesive layers, including a second adhesive layer with higher adhesion, to prevent moisture ingress and enhance sealing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If laser cutting is used to process the window and touch screen panel, then manufacturing precision and productivity are improved, but the edges become exposed and vulnerable to moisture permeation

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidmoisture permeation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The window is designed with a bent part that extends beyond the touch screen panel edge before assembly, creating a preliminary sealing structure that prevents moisture from reaching the exposed edges during and after assembly. This preliminary protective structure counteracts the harmful effect of laser-cut exposed edges

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

A bent part of the window acts as an intermediary sealing element between the external environment and the exposed edges of the touch screen panel. This intermediary structure blocks moisture permeation paths that would otherwise directly contact the vulnerable laser-cut edges

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the window is designed with a bent part to seal the touch screen panel, then moisture resistance is improved, but device complexity increases

Engineering Contradiction:

Improvemoisture resistanceVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bent part of the window serves multiple functions simultaneously: it provides structural support, creates the sealing barrier against moisture, and extends to cover the exposed edges. This multi-functionality reduces the need for additional separate sealing components, thereby limiting the increase in device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If adhesive layers are used to seal the touch screen panel, then moisture resistance is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesealing performanceVSAvoidalignment precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The adhesive layer functions as a flexible sealing film that can accommodate minor misalignments and surface irregularities. This flexibility reduces the stringent alignment precision requirements compared to rigid sealing methods, while still providing effective moisture resistance

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS10146263B2Display device having improved defect and moisture resistance

Publication Date: 2018.12.04 SAMSUNG DISPLAY CO LTD

AI summary

Provided is a display device including: a display panel configured to generate an image; a touch screen panel formed on the display panel; and a window formed on the touch screen panel and extending over a side edge of the touch screen panel to facilitate a covering and sealing of the touch screen panel. According to the present invention, by providing a display device having a laminated structure in which the edge of the touch screen panel is sealed so as to prevent moisture from permeating from the outside, occurrence of product defects may be prevented.