Residual Image Detection in Display Panels Using Reference Calibration
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Solution Overview
Problem
Current methods for detecting residual images in display panels are subjective and lack accuracy, leading to inconsistent evaluations due to manual visual detection, which affects the reliability and stability of quality assessment.
Innovation Solution
A method and device that control a display panel to display a checkerboard image followed by a detection image with a predetermined gray scale, and a reference display panel to display a calibration image with alternating matrix images, allowing for objective comparison to determine the residual image level by creating a significant brightness difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual visual detection is used to evaluate residual image, then the detection process is simple and fast, but the measurement precision and reliability are poor due to subjectivity
Solution Approach 1:
The patent introduces a reference display panel as an intermediary device to display calibration images with known residual image characteristics. This reference panel serves as a mediator between the test display panel and the human evaluator, providing an objective benchmark for comparison that reduces subjectivity while maintaining a relatively simple detection system structure.
Solution Approach 2:
The patent changes the parameters of the calibration images displayed on the reference panel, specifically using images with different gray scale values (first gray scale, second gray scale, and intermediate gray scales). By varying these parameters systematically, the method enables precise measurement of residual image levels through comparison, transforming a subjective visual assessment into a parameter-based objective evaluation.
2Reliability
If a reference display panel with calibration images is introduced, then the measurement precision improves through objective comparison, but the device complexity increases
Solution Approach 1:
The patent segments the detection system into two independent parts: a test display panel for displaying detection images and a reference display panel for displaying calibration images. This segmentation allows each component to perform its specific function independently, improving reliability through comparison while keeping the overall device structure manageable through functional separation.
Solution Approach 2:
The reference display panel creates a copied version of the calibration images with known residual image characteristics. By displaying these copied images simultaneously with the detection images on the test panel, the system enables objective comparison and reliable evaluation without requiring complex automated analysis equipment, thus balancing reliability improvement with acceptable device complexity.
3Measurement precision
If calibration images with multiple gray scales are used, then the measurement precision and objectivity improve, but the ease of operation decreases due to complex image configuration
Solution Approach 1:
The calibration images with multiple gray scales (first gray scale, second gray scale, and intermediate gray scales) are prepared in advance and stored. During the detection process, these pre-configured calibration images are directly displayed on the reference panel without requiring real-time generation or complex configuration, thus maintaining measurement precision while simplifying the operational process.
Solution Approach 2:
The patent establishes a systematic parameter change scheme where calibration images use discrete gray scale values (first gray scale, second gray scale, and intermediate gray scales between them). This systematic parameter variation provides a standardized measurement scale that improves precision while making the detection process more operable through consistent, repeatable procedures.
Data Source
AI summary
This application discloses a method for detecting residual image of a display panel, including: controlling a display panel to display a checkerboard image including pure-color sub-images, gray scales of two adjacent pure-color sub-images are a first gray scale and a second gray scale; controlling, after the checkerboard image has been displayed for a first time period, the display panel to display a detection image with a predetermined gray scale; controlling a reference display panel to display a calibration image including first and second matrix images, a gray scale of each first matrix image is the same as the predetermined gray scale, gray scales of each second matrix image includes a third gray scale being the same as the predetermined gray scale and a fourth gray scale different from the predetermined gray scale; comparing the detection image and the calibration image to obtain a residual image level of the display panel.