Display Device Brightness Deterioration Discrimination

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Solution Overview

Problem

Conventional methods for manufacturing organic light-emitting devices fail to accurately discriminate defective items with short brightness life, leading to potential shipment of defective products.

Innovation Solution

A display device manufacturing method that involves lighting up the device for a predetermined period, measuring initial and final brightness, calculating the deterioration rate, and identifying defective items if the rate exceeds a threshold value.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional brightness prediction methods are used, then aging time can be calculated, but defective items with short brightness life cannot be discriminated

Engineering Contradiction:

Improveaccuracy of brightness life predictionVSAvoidability to discriminate defective items

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by measuring brightness at multiple time points during an aging period before final discrimination. Instead of relying solely on predicted aging time, the method performs preliminary brightness measurements at intermediate time points to detect actual deterioration trends, enabling early identification of defective items that would otherwise be missed by conventional prediction methods alone

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by comparing actual brightness measurements taken during aging against predicted brightness values. This feedback mechanism allows the system to detect deviations from expected performance and identify defective items with short brightness life, thereby improving discrimination accuracy beyond what conventional prediction methods can achieve

Inventive Principle:

Principle #23Feedback

2Measurement precision

If brightness measurements are taken over extended periods to improve discrimination accuracy, then defective items can be identified, but manufacturing time increases

Engineering Contradiction:

Improveaccuracy of defective item discriminationVSAvoidmanufacturing time for brightness testing

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies partial action by measuring brightness at selectively chosen time points during aging rather than continuously monitoring throughout the entire aging period. By taking measurements at critical intermediate time points and comparing against predicted values, the method achieves sufficient discrimination accuracy without requiring complete extended-period monitoring, thus reducing manufacturing time

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent makes the brightness measurement system multi-functional by using the same measurement apparatus and procedure for both aging time calculation and defective item discrimination. This universal approach allows the system to perform multiple functions (predicting aging and identifying defects) simultaneously without requiring additional specialized equipment or separate testing procedures, thereby minimizing time loss

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10157558B2Display device manufacturing method

Publication Date: 2018.12.18 MAGNOLIA BLUE CORP

AI summary

A display device manufacturing method includes: lighting up a display device for a predetermined period; measuring, as first brightness, brightness of the display device at a start of lighting; measuring, as second brightness, brightness of the display device when the predetermined period has elapsed; calculating a deterioration rate of the second brightness with respect to the first brightness; and discriminating the display device as a defective item if the deterioration rate is greater than a threshold value.