LCD Panel Bonding Layer Prevents Elastomer Penetration

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Solution Overview

Problem

The prepolymeric precursor of the elastomer used in liquid crystal image display devices has low viscosity, leading to unwanted spread and penetration, causing expansion and degradation of adjacent members, such as polarizing plates and conductive adhesives, which affects the performance of the display device.

Innovation Solution

A bonding layer is used between the liquid crystal panel and the transparent protective plate, which is larger than the display area and has surface irregularities, preventing the elastomer from spreading and adhering to adjacent members, and frame members are employed to enclose and seal the periphery of the elastomer to prevent unwanted spread.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If the bonding operation takes time, then the bonding process can be completed thoroughly, but the prepolymeric precursor of the elastomer spreads to adjacent members

Engineering Contradiction:

Improvebonding operation timeVSAvoidspread control of prepolymer

Core Design Contradiction:

Duration of action of stationary objectVSManufacturing precision

Solution Approach 1:

A release paper is introduced as an intermediary barrier between the prepolymeric precursor and adjacent members. The release paper prevents the low-viscosity prepolymer from spreading to and penetrating polarizing plates, conductive adhesives, and silicone coating agents during the bonding operation, allowing sufficient bonding time without compromising manufacturing precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The release paper is applied beforehand to protect adjacent members from the harmful spreading effect of the prepolymer. This preliminary protective action prevents potential damage before it occurs, enabling the bonding process to proceed without time constraints that would otherwise limit the operation duration.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If the prepolymer contacts the cut edges of the polarizing plates, then the polarizing plates may expand and degrade, but preventing contact requires additional protective measures

Engineering Contradiction:

Improveperformance of polarizing platesVSAvoidprotective configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The release paper serves as a protective intermediary that is placed between the prepolymeric precursor and the cut edges of the polarizing plates. This simple barrier prevents the prepolymer from penetrating the TAC material and causing expansion or degradation, maintaining polarizing plate reliability without adding complex protective structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If the prepolymer contacts the conductive adhesive, then the adhesive may swell resulting in poor adherence and conductivity, but preventing contact complicates the bonding process

Engineering Contradiction:

Improveadherence and conductivity of conductive adhesiveVSAvoidbonding process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The release paper acts as a protective barrier between the prepolymeric precursor and the conductive adhesive used for bonding LCD driver ICs to the glass substrates. This prevents the prepolymer from causing swelling that would degrade adherence and conductivity, maintaining reliable electrical connections while keeping the bonding process simple and straightforward.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If the prepolymer contacts the silicone coating agent, then the coating agent may swell and lose sealing properties, but preventing contact requires additional protective steps

Engineering Contradiction:

Improvesealing properties of silicone coating agentVSAvoidbonding process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The release paper serves as a protective intermediary that prevents the prepolymeric precursor from contacting the silicone coating agent used for sealing the liquid crystal layer and glass substrates. This stops the prepolymer from causing swelling and loss of sealing properties, maintaining the integrity of the liquid crystal panel while keeping the bonding process simple without requiring additional protective steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This configuration effectively prevents the elastomer from spreading and penetrating into adjacent components, enhancing the performance and reliability of the image display device by maintaining the integrity of polarizing plates and conductive adhesives.

Implementation Method 1

a bonding layer disposed between and bonding the transparent protective plate and the liquid crystal panel

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS7903205B2Image display device

Publication Date: 2011.03.08 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

AI summary

An object of the present invention is to provide an image display device having a configuration that allows the device to be manufactured in such a way as to prevent unwanted spread and penetration of the polymeric precursor of the elastomer in its liquid display panel and thereby prevent the expansion and degradation of the members adjacent to the panel, which leads to an improvement in the performance of the image display device.