Gap Retaining Member Adhesive Application for Display Substrate Bonding

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Solution Overview

Problem

Existing display medium manufacturing methods face challenges in achieving strong adhesion between substrates while maintaining electrical field integrity and light permeability, often resulting in transfer defects and increased production costs due to the interference of adhesives with the particle dispersion liquid.

Innovation Solution

A method involving a gap retaining member with an adhesive component insoluble in the dispersion medium, applied only to the top surface of the gap retaining member, allowing for substrate adhesion without interfering with the particle dispersion liquid, thereby securing adhesion power and preventing electrical field interruption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If adhesive is applied to the entire surface of the gap retaining member, then adhesion strength between substrates is improved, but electrical field integrity and light permeability are compromised due to adhesive interference with particle dispersion liquid

Engineering Contradiction:

Improveadhesion strengthVSAvoidelectrical field integrity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The adhesive is applied selectively only to the top surface of the gap retaining member that will contact the second substrate, rather than the entire surface. This local application ensures strong adhesion where needed while preventing adhesive interference with the particle dispersion liquid in other areas, thus maintaining electrical field integrity and light permeability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The gap retaining member is segmented into different functional zones: the top surface serves as the adhesion interface with the second substrate, while the side surfaces and bottom interface with the particle dispersion liquid. This segmentation allows the adhesive to be applied only where it provides benefit (top surface) without compromising the electrical and optical properties in other regions.

Inventive Principle:

Principle #1Segmentation

2Strength

If adhesive is applied to the gap retaining member, then substrate adhesion is improved, but transfer defects increase due to adhesive interference with particle dispersion liquid

Engineering Contradiction:

Improvesubstrate adhesionVSAvoidtransfer defects

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The adhesive application is localized to the top surface of the gap retaining member, creating a clear spatial separation between the adhesive zone and the particle dispersion liquid zone. This prevents the adhesive from interfering with the particle dispersion liquid, thereby eliminating transfer defects while maintaining substrate adhesion.

Inventive Principle:

Principle #3Local quality

3Strength

If adhesive component is present on the second substrate surface, then adhesion is improved, but production costs increase due to additional processing requirements

Engineering Contradiction:

ImproveadhesionVSAvoidproduction cost

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The adhesive component is extracted from the second substrate surface through the selective application process. By applying adhesive only to the gap retaining member's top surface and using a solvent that evaporates completely, the adhesive component is removed from areas that would interfere with the particle dispersion liquid, simplifying the manufacturing process and reducing costs.

Inventive Principle:

Principle #2Taking out (Extraction)

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 approach ensures strong adhesion between substrates, minimizes transfer defects, maintains light permeability, and reduces production costs by preventing adhesive interference with the particle dispersion liquid, while supporting fine planar accuracy and thin film formation.

Implementation Method 1

adhering the first substrate and a second substrate together via the gap retaining member, by contacting the second substrate with the adhesive applied to the top surface of the gap retaining member and drying the solvent of the adhesive so as to adhere the second substrate to the top surface of the gap retaining member by the adhesive component of the adhesive

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

drying the solvent of the adhesive so as to adhere the second substrate to the top surface of the gap retaining member by the adhesive component of the adhesive

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS8526101B2Method of manufacturing display medium, display medium, and display apparatus

Publication Date: 2013.09.03 E INK CORP

AI summary

The present invention provides a method of manufacturing a display medium, including preparing a first substrate on which a gap retaining member that retains a gap between substrates is disposed in a protruded form; applying an adhesive to a top surface of the gap retaining member; disposing a particle dispersion liquid on an area surrounded by the first substrate and the gap retaining member; and adhering the first substrate and a second substrate together via the gap retaining member, by contacting the second substrate with the adhesive applied to the top surface of the gap retaining member and drying the solvent of the adhesive so as to adhere the second substrate to the top surface of the gap retaining member by the adhesive component of the adhesive. The display medium and a display apparatus including the display medium and an electrical field-generating unit are also provided.