Bonding Layer Hygroscopic Agent Display Polarizing Plate

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Solution Overview

Problem

Polarizing plates in display devices deteriorate in high temperature conditions due to moisture retention, leading to chemical changes and color shifts, which degrade image quality.

Innovation Solution

A display device with a bonding layer containing a hygroscopic agent is used between the polarizing plate and the protective layer, allowing moisture to evaporate and be absorbed, thereby suppressing chemical reactions and maintaining polarizing plate characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a polarizing plate is used in a display device, then image display function is achieved, but reliability deteriorates in hot and humid environments due to moisture retention causing chemical changes and color shifts

Engineering Contradiction:

Improvereliability at high temperatureVSAvoidmoisture retention

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A bonding layer is introduced as an intermediary component between the protective layer and the polarizing plate. This bonding layer contains a hygroscopic agent that actively absorbs moisture from the polarizing plate, preventing moisture retention and its harmful effects while maintaining the structural integrity of the display device

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The hygroscopic agent in the bonding layer converts the harmful effect of moisture into a beneficial function by actively absorbing and managing moisture that would otherwise cause chemical changes and color shifts in the polarizing plate, thereby improving reliability in hot and humid environments

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 effectively improves the reliability of display devices at high temperatures by preventing color changes and maintaining image quality.

Implementation Method 1

The bonding layer contains a hygroscopic agent... allowing moisture to evaporate and be absorbed

Methodology Applied

Scientific EffectHygroscopic absorption: Absorption (physical)

Implementation Method 2

allowing moisture to evaporate and be absorbed

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS10996497B2Display device and method for producing display device

Publication Date: 2021.05.04 PANASONIC AUTOMOTIVE SYST CO LTD

AI summary

A display device includes a display, a protective layer, and a bonding layer. The display has a polarizing plate configuring an image display plane of a display. The protective layer faces the polarizing plate. The bonding layer is disposed between the polarizing plate and the protective layer and is directly bonded to the polarizing plate and the protective layer. The bonding layer contains a hygroscopic agent.