Display Region Detection Using Multi-Line Threshold Scanning
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Solution Overview
Problem
Existing methods for detecting the display region of a display device in defect inspection are prone to errors due to abnormal signal levels caused by defects in the sensor panel, leading to inaccurate determination of the display region edges.
Innovation Solution
A region detection device that scans plural lines intersecting the display region's outer edge, comparing pixel values with a threshold to accurately detect the coordinate positions of the edges, thereby improving detection accuracy by suppressing the influence of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display region is detected using conventional methods based on dark/light value differences, then the detection process is simple, but the detection accuracy deteriorates due to abnormal signals from sensor panel defects
Solution Approach 1:
The detection process is segmented into multiple scanning passes. First, a preliminary scan identifies candidate edge positions using threshold comparison. Then, a second verification scan confirms the actual edge position by checking for consistent threshold crossings across multiple lines. This segmentation allows the system to handle sensor defects by not relying on a single scan result.
Solution Approach 2:
The patent performs more scanning operations than the minimum required for simple detection. By scanning multiple lines and performing verification passes, the system exceeds the basic detection requirement. This excessive action ensures that abnormal signals from sensor defects do not lead to erroneous edge detection, thereby improving measurement precision at the cost of increased processing complexity.
2Area of stationary object
If sensor panel size and pixel count are increased to improve inspection coverage, then the inspection capability is enhanced, but the computational load and detection complexity increase
Solution Approach 1:
The large inspection area is divided into multiple scan lines that are processed independently. Each line is scanned and evaluated separately for edge detection, allowing the system to handle large sensor panels without overwhelming computational complexity. The segmentation of the detection task across multiple lines enables manageable processing of large areas.
Solution Approach 2:
The patent applies verification scanning to each line individually, performing more operations than a simple single-pass detection would require. This partial verification approach across multiple lines ensures accurate edge detection throughout the entire large inspection area while keeping the complexity of each individual line processing manageable.
3Reliability
If abnormal signals from sensor defects are processed using conventional methods, then all pixel data is utilized, but erroneous edge detection occurs at display region boundaries
Solution Approach 1:
The patent extracts and identifies abnormal signal patterns from the pixel data during scanning. When a pixel value deviates significantly from expected patterns (indicating a sensor defect), the system extracts this anomaly and excludes it from edge detection calculations. This allows the system to utilize valid pixel data while removing the influence of defective sensor regions.
Solution Approach 2:
The patent introduces an intermediary verification step between raw pixel data and edge detection results. The verification scan acts as a mediator that checks whether detected edges are consistent with actual display region boundaries. This intermediary process filters out erroneous detections caused by sensor defects while preserving valid edge information.
Data Source
AI summary
A region detection device for detecting a display region of a display device from an inspection image captured in a state in which the display region is lighted, is provided. The region detection device scans plural lines set to intersect a side forming an outer edge of the display region, and specifies the display region by detecting a coordinate position of each side based on a pixel value of a pixel of each of the plural lines. In the scanning of the plural lines, the region detection device compares each of the pixel values of the pixels included in the plural lines with a threshold, and detect, as the coordinate position, a position in a scanning direction at which all the pixel values of the plural lines change from values smaller than the threshold to values not smaller than the threshold.