Display Panel Inspection Using Grayscale Analysis
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Solution Overview
Problem
Conventional display panel inspection methods using transmitted light sources struggle to distinguish between different types of pixel electrodes, such as RGB pixel electrodes, due to their similar pattern shapes, leading to difficulties in defect inspection.
Innovation Solution
A method and apparatus that capture grayscale images of display panels irradiated by a predetermined light source, analyze the grayscale ranges of pixel electrode images, and use a predetermined correspondence to identify the type of pixel electrodes, determining if grayscale differences exceed a threshold to identify abnormal electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If transmitted light source is used for inspection, then the inspection can be performed, but the pixel electrodes of different types cannot be distinguished
Solution Approach 1:
The patent changes the inspection parameter from transmitted light to reflected light, which alters how different pixel electrode types interact with light. This parameter change enables the detection of grayscale differences that correspond to different electrode types (RGB), allowing inspection technicians to distinguish between them effectively
Solution Approach 2:
The patent introduces an intermediary substance (liquid crystal material with specific optical properties) between the light source and pixel electrodes. This intermediary modifies the light interaction mechanism, enabling reflected light to carry information about the underlying electrode types that would otherwise be invisible in transmitted light mode
2Measurement precision
If grayscale analysis is implemented to identify pixel electrode types, then different types can be distinguished, but the inspection system complexity increases
Solution Approach 1:
The patent replaces complex optical filtering systems or multiple light sources with a simpler grayscale analysis approach using reflected light. Instead of using mechanical or optical mechanisms to separate and identify different electrode types, the system uses digital image processing to analyze grayscale values, thereby reducing hardware complexity while maintaining identification precision
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
Enables effective identification of different pixel electrode types and detection of defective electrodes using grayscale analysis, applicable for both reflected and transmitted light, without increasing hardware costs, and simplifying equipment design.
Implementation Method 1
the structural design of various display panel testing equipments generally has limitations on the inspection by using the transmitted light source, and only reflected light can be used for the purpose
Data Source
AI summary
A display panel inspection method and a apparatus are provided, and the method includes the steps of: capturing a grayscale image while a predetermined light source is irradiating a display panel, and the grayscale image including plural pixel electrode images corresponsive to plural pixel electrodes in the display panel respectively; obtaining a grayscale range of the respective pixel electrode image; calling a predetermined correspondence between a predetermined grayscale range and a pixel electrode type; and identifying the pixel electrode type of the respective pixel electrode image according to the predetermined correspondence and the grayscale range.