Array Substrate Detection Without Organic Light-Emitting Layer

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Solution Overview

Problem

The high cost and complexity of display panel detection processes, particularly in AMOLED manufacturing, due to the need for an organic light-emitting layer, which complicates distinguishing deficiencies in array substrates and reduces detection efficiency.

Innovation Solution

A method involving applying driving signals to pixel electrodes on an array substrate, forming a second electrode, and monitoring voltages and currents to detect deficiencies without manufacturing an organic light-emitting layer, simplifying the detection process and reducing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the organic light-emitting layer is manufactured to verify array substrate reliability, then the reliability of array test can be verified, but the detection cost increases significantly and the process becomes complicated

Engineering Contradiction:

Improvereliability of array testVSAvoiddetection process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the essential detection function from the complete display panel structure by removing the organic light-emitting layer. The detection method uses the array substrate alone with pixel electrodes and pixel switches to perform electrical measurements, extracting only the necessary components for reliability verification while eliminating costly and complexity-introducing layers.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent creates a simplified detection model that copies the essential electrical characteristics of the complete display panel without requiring the actual organic light-emitting layer. By using the array substrate with pixel electrodes and applying driving signals, the method replicates the functional behavior needed for reliability testing at a fraction of the cost and complexity.

Inventive Principle:

Principle #26Copying

2Reliability

If the organic light-emitting layer is manufactured for detection, then array substrate reliability can be verified, but the detection cost increases significantly

Engineering Contradiction:

Improvereliability of array testVSAvoiddetection cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs a disposable or temporary detection configuration using only the array substrate with pixel electrodes, avoiding the expensive organic light-emitting layer manufacturing process. This temporary detection setup achieves the necessary reliability verification without the high costs associated with producing complete display panels for testing purposes.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the organic light-emitting layer is manufactured to test display panel cells, then reliability verification is possible, but new deficiencies are introduced that complicate the detection process

Engineering Contradiction:

Improvereliability verificationVSAvoiddeficiency identification difficulty

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies preliminary anti-action by performing detection on the array substrate before the organic light-emitting layer manufacturing process can introduce new deficiencies. By testing the pixel electrodes and pixel switches in isolation first, the method prevents the confounding of original array substrate defects with potential defects introduced during subsequent organic layer fabrication.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent segments the detection process into distinct stages: first detecting the array substrate with pixel electrodes and pixel switches independently, then separately evaluating the organic light-emitting layer if needed. This segmentation allows clear identification of which stage introduced which deficiencies, eliminating the confusion that arises when testing the complete integrated structure.

Inventive Principle:

Principle #1Segmentation

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 significantly reduces detection costs, simplifies the process, and enhances detection efficiency by excluding interference from organic light-emitting layer deficiencies, thereby improving the reliability of array substrate testing.

Implementation Method 1

The pixel electrode is one of the cathode and the anode of the electroluminescent device, the second electrode is the other one of the cathode and the anode of the electroluminescent device

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS10373537B2Method for detecting array substrate of display panel

Publication Date: 2019.08.06 BOE TECHNOLOGY GROUP CO LTD

AI summary

A method for detecting a display panel is disclosed. The display panel comprises an array substrate for driving an electroluminescent device. The array substrate comprises pixel electrodes arranged in an array and an array of pixel switches for driving the pixel electrodes. The method comprises the steps of: S1, applying a first driving signal to a manufactured array substrate, monitoring a first voltage on the pixel electrode; S2, forming a second electrode on each of the pixel electrodes of the array substrate; S3, applying a second driving signal to the array substrate formed with the second electrode, monitoring a second current flowing through the second electrode. The pixel electrode is one of the cathode and the anode of the electroluminescent device, the second electrode is the other one of the cathode and the anode of the electroluminescent device.