Display Panel Surface Inspection Using Self-Displayed Fringe Patterns
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Solution Overview
Problem
Existing surface inspection methods for display panels face limitations in resolution and precision due to the need for projecting patterns, which restricts the detection of fine surface curvatures and defects.
Innovation Solution
A method and device that utilize the display panel itself to display a test pattern, such as a fringe pattern, and capture images at various angles to obtain three-dimensional surface distortion shapes, enabling precise detection of defects without projecting patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a projector is used to project a pattern on the surface of the display panel, then surface inspection can be performed, but the resolution is limited and fine surface curvature cannot be detected
Solution Approach 1:
The display panel itself displays the test pattern (fringe pattern) that is used for inspection, eliminating the need for an external projector. The panel's own display capability is utilized to generate the inspection pattern, thereby simplifying the equipment while enabling high-resolution detection of fine surface curvatures through the panel's native pixel structure
Solution Approach 2:
The invention changes the pattern display method from external projection to internal display through the panel's pixels. By having the panel display the fringe pattern through its own pixel structure, the system achieves higher resolution inspection capability while reducing equipment complexity
2Ease of operation
If a projector is used to project a pattern on the surface of the display panel, then surface inspection can be performed, but the equipment becomes complex
Solution Approach 1:
The display panel displays the test pattern itself, eliminating the need for external projection equipment. This self-service approach simplifies the inspection process by removing the projector component while maintaining the ability to perform surface inspection through the panel's own display functionality
Solution Approach 2:
The invention extracts and removes the projector from the inspection system, relying instead on the display panel's inherent capability to display patterns. This extraction of the external projection component simplifies the overall equipment structure while preserving the inspection function
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 precise and simple surface inspection of display panels by displaying test patterns with the panel's pixels, allowing for the detection of fine surface curvatures and defects, improving measurement consistency and defect detection accuracy.
Implementation Method 1
the display panel may include pixels, and the test pattern may be displayed by a combination of light emitted by the pixels
Implementation Method 2
three-dimensional data of a surface of the display panel may be obtained from an image obtained by projecting a pattern on the surface of the display panel and capturing a pattern reflected by the surface of the display panel with a camera
Data Source
AI summary
A surface inspection method includes applying a signal to a display panel so that the display panel displays a test pattern; capturing a surface of the display panel on which the test pattern is displayed with a camera; and processing a captured image data to obtain a surface distortion shape.