Binder Curing Rate Evaluation via Stress-Strain Measurement

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Solution Overview

Problem

The existing methods for evaluating the curing rate of photo-curable binders are inadequate, leading to potential bonding defects and display failures due to insufficient bonding force and uneven filling of stepped portions in display devices.

Innovation Solution

A method involving the application of stress to the binder using a measurement apparatus, where the strain is measured and used to calculate the curing rate, determining whether the binder is defective by comparing the measured strain with reference values of non-defective binders, and applying shear or compressive stress to assess the binder's properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a photo-curable binder is fully cured before application, then bonding force is sufficient, but the binder cannot compensate for step differences and causes display failure

Engineering Contradiction:

Improvebonding forceVSAvoiddisplay failure

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The binder is applied in a partially cured state before full curing, allowing it to flow and fill step differences during application. The curing process is then completed after application to achieve sufficient bonding force, thereby preventing display failure while maintaining bonding strength.

Inventive Principle:

Principle #10Preliminary action

2Strength

If the curing rate is high, then bonding force is improved, but the compensation function of step difference cannot be performed smoothly

Engineering Contradiction:

Improvebonding forceVSAvoidstep difference filling

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The curing rate is dynamically controlled during the curing process. By adjusting the curing rate to be lower during application and higher during subsequent curing, the binder can first fill step differences smoothly and then achieve sufficient bonding force, resolving the contradiction between manufacturing precision and strength.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If existing evaluation methods are used, then the evaluation process is simple, but the curing rate cannot be accurately measured leading to bonding defects

Engineering Contradiction:

Improveevaluation processVSAvoidcuring rate measurement

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces complex mechanical or chemical evaluation methods with an optical measurement system. By measuring the refractive index of the binder, which changes with curing degree, the system can accurately determine the curing rate using simple optical equipment, thereby improving measurement precision while keeping the evaluation process relatively simple.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11635360B2Method for evaluating binder

Publication Date: 2023.04.25 SAMSUNG DISPLAY CO LTD

AI summary

A method for evaluating a binder includes disposing the binder on a first plate, bringing a second plate, which faces the first plate, into contact with one surface of the binder, applying a stress to the binder through the second plate, measuring a strain of the binder due to the applied stress, and calculating a curing rate of the binder based on the strain of the binder.