Liquid Crystal Display Panel Sealant Defect Detection
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Solution Overview
Problem
Existing liquid crystal display panels face challenges in detecting micro gaps or breaking sealant issues during the manufacturing process, leading to defective sealing performance and reduced yield due to the transparency of the sealant, making it difficult for optical apparatuses to identify these problems.
Innovation Solution
A liquid crystal display panel design featuring anisotropic conductive adhesive with independent first and second conductive portions on the array and opposed substrates, respectively, connected through conductive spheres to form an unclosed conductor, allowing for electrical testing to detect resistance abnormalities indicative of sealant defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent sealant is used between substrates, then the display quality and aesthetics are improved, but the detectability of sealant defects becomes difficult
Solution Approach 1:
The patent introduces conductive spheres as an intermediary substance within the transparent sealant. These spheres serve as a mediator that enables electrical detection of sealant integrity without compromising the visual quality of the display. The conductive spheres allow electrical signals to pass through the sealant layer, making it possible to detect defects like micro-gaps or broken sealant that would otherwise be invisible.
Solution Approach 2:
The patent replaces optical detection methods with electrical detection methods. Instead of using optical apparatus to visually inspect the transparent sealant for defects, the invention uses electrical conductivity measurements through the conductive spheres to detect sealant integrity. This substitution of detection mechanism solves the problem of invisible defects in transparent materials.
2Illumination intensity
If sealant transparency is maintained for aesthetic purposes, then the appearance quality is improved, but the manufacturing yield decreases due to undetected defects
Solution Approach 1:
The patent implements preliminary detection of sealant defects during the manufacturing process, before final product completion. By incorporating conductive spheres and performing electrical resistance measurements on the sealant layer early in the manufacturing process, defective panels can be identified and removed before they become finished products, thereby improving manufacturing yield while maintaining aesthetic quality.
Solution Approach 2:
The patent establishes a feedback mechanism by measuring the electrical resistance of the sealant layer containing conductive spheres. This resistance measurement provides immediate feedback on sealant integrity, allowing manufacturers to identify and correct defects during production. The feedback system enables real-time quality control, improving yield by preventing defective products from advancing to later manufacturing stages.
3Device complexity
If conventional optical detection is used for sealant inspection, then the detection process is simple, but the detection precision for micro gaps is insufficient
Solution Approach 1:
The patent replaces the simple but imprecise optical detection system with an electrical detection system based on conductivity measurements through conductive spheres. This substitution maintains operational simplicity while dramatically improving measurement precision for detecting micro-gaps and small defects in the sealant that optical methods cannot reliably identify.
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 solution enables effective detection of micro gaps or breaking sealant problems, improving the yield of liquid crystal display panels by preventing defective units from progressing to subsequent processes.
Implementation Method 1
all of the first conductive portions and all of the second conductive portions are electrically connected through the sealant to form an unclosed conductor surrounding the display region
Implementation Method 2
the sealant is anisotropic conductive adhesive
Data Source
AI summary
A liquid crystal display panel, a sealing performance testing method thereof and a display device are provided. In the liquid crystal display panel, a side of the array substrate facing the opposed substrate is provided with a plurality of independent first conductive portions, a side of the opposed substrate facing the array substrate is provided with a plurality of independent second conductive portions, sealant is an anisotropic conductive adhesive, all of the first conductive portions and all of the second conductive portions are electrically connected through the sealant to form an unclosed conductor surrounding a display region; by testing a resistance value between any two first conductive portions on the array substrate, it can be determined that there is a micro gap or breaking sealant problem upon the resistance value being abnormal.