Display Device Compensation via Third-Order Polynomial Fitting
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Solution Overview
Problem
The existing camera compensation method for display devices suffers from inaccurate position data due to reduced accuracy, leading to incomplete defect compensation and reduced display quality.
Innovation Solution
A method that involves displaying calibration patterns and full white displays, capturing images with a camera, and performing two-dimensional third-order polynomial fitting and symmetry calculations to improve position data accuracy and alignment, thereby maximizing defect compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera compensation method is used to detect positional luminance, then luminance deviation can be compensated, but position data accuracy is reduced leading to inaccurate defect compensation
Solution Approach 1:
The patent applies preliminary action by performing polynomial fitting on position data before using it for defect compensation. The system pre-processes the position data obtained from camera imaging by fitting it to a polynomial function, thereby correcting systematic position errors in advance and improving the accuracy of subsequent defect compensation operations.
Solution Approach 2:
The patent introduces an intermediary approach by using polynomial fitting as a mediator between raw camera position data and defect compensation. The polynomial function serves as an intermediate processing layer that transforms inaccurate position data into corrected position information, enabling accurate defect compensation without directly modifying the camera hardware.
2Adaptability or versatility
If mapping is performed to correspond display image to photograph image, then resolution difference is addressed, but position accuracy is reduced in high MTF regions
Solution Approach 1:
The patent applies parameter changes by transforming the position data through polynomial fitting functions. The system changes the mathematical representation of position coordinates from raw camera measurements to fitted polynomial values, thereby correcting position accuracy while maintaining the adaptability of image correspondence across different resolution conditions.
3Productivity
If defect compensation is performed with inaccurate position data, then compensation process is completed, but defect compensation effect is reduced and display quality deteriorates
Solution Approach 1:
The patent maintains productivity while improving manufacturing precision by performing polynomial fitting as a preliminary step before defect compensation. This pre-processing of position data ensures that subsequent compensation operations use accurate position information, thereby achieving both efficient processing and high display quality without requiring multiple iterative corrections.
Data Source
AI summary
A method of compensating a display device includes: displaying a first display image of a calibration pattern; generating a first photograph image of the calibration pattern by capturing the first display image; generating a measurement representative position data corresponding to the calibration pattern by measuring the first photograph image; generating a third-order fitting representative position data by performing a two-dimensional third-order fitting; displaying a second display image of a full white display; generating a second photograph image of the full white display by capturing the second display image; generating a first crop image by performing a size adjustment based on the third-order fitting representative position data; calculating a luminance compensation value by comparing a measured luminance of the first crop image with a target luminance; and generating a compensated image data by applying the luminance compensation value to an image data.