Electrooptic Device Adhesive Layer Spacer Design

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Solution Overview

Problem

Liquid-crystal display devices face issues with uneven adhesive layers due to pressure, leading to the generation of Newton's rings and reduced contrast, especially as panels become thinner, and existing solutions with thicker adhesive layers are not optimal for modern thin panels.

Innovation Solution

Incorporating spacers on the functional member or display panel to maintain a consistent gap, using spherical or fiber spacers no larger than 50 μm to ensure an even adhesive layer thickness of 50 μm or less, and employing a transparent adhesive to maintain visibility and reduce manufacturing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a thick adhesive layer is used to prevent Newton's rings, then the adhesive layer becomes thick enough to avoid uneven gaps, but the overall device thickness increases and manufacturing precision deteriorates

Engineering Contradiction:

Improveprevention of Newton's ringsVSAvoidadhesive layer thickness control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Spacers are dispersed in the adhesive layer before bonding occurs, pre-establishing the correct gap thickness between the liquid-crystal display panel and the functional member. This preliminary positioning prevents uneven gaps and Newton's rings during the bonding process, while maintaining precise thickness control without requiring thick adhesive layers.

Inventive Principle:

Principle #10Preliminary action

2Strength

If pressure is applied during polarizer bonding to ensure adhesion, then bonding strength improves, but the adhesive layer becomes uneven in thickness

Engineering Contradiction:

Improvebonding strengthVSAvoidadhesive layer uniformity

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

Spacers are incorporated into the adhesive layer before bonding, pre-defining the gap thickness. This allows pressure to be applied during bonding to ensure strong adhesion without causing uneven compression of the adhesive layer, as the spacers maintain uniform thickness throughout the bonding process.

Inventive Principle:

Principle #10Preliminary action

3Weight of moving object

If the liquid-crystal display panel is made thinner to reduce device size, then device weight and size decrease, but the panel becomes more prone to uneven gaps

Engineering Contradiction:

Improvedevice weightVSAvoidgap uniformity

Core Design Contradiction:

Weight of moving objectVSReliability

Solution Approach 1:

Spacers are dispersed in the adhesive layer before bonding, pre-establishing uniform gap thickness. This is particularly important for thin liquid-crystal display panels, as the spacers compensate for the reduced rigidity of thinner panels during bonding, ensuring uniform gaps and preventing Newton's rings even when the panel itself is very thin.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8064032B2Electrooptic device, method for manufacturing the same, and electronic device

Publication Date: 2011.11.22 MAGNOLIA WHITE CORP

AI summary

An electrooptic device includes: a display panel; an adhesive layer mounted on the outer surface of the display panel; and a functional member bonded to the display panel with the adhesive layer. The adhesive layer has spacers dispersed on the functional member or the display panel.