OLED Pixel Voltage Compensation for Automated Defect Repair
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Solution Overview
Problem
Current OLED display products face challenges in repairing display defects due to complex and dense backplane circuits, leading to low repair rates, high labor costs, and reduced productivity.
Innovation Solution
A method and apparatus for repairing display defects in OLED panels by inputting data voltages to pixels, determining reference and defect pixels, calculating compensation data voltages, and adjusting pixel brightness to match reference pixels, thereby automating the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If manual repair methods are used for display defects in OLED panels, then repair can be performed, but the repair rate is low, labor cost is high, and productivity is low
Solution Approach 1:
The patent replaces manual mechanical repair operations with an automated detection and repair system. The system uses a camera to capture display images, processes the images to identify defect pixels, and automatically adjusts data voltages to repair defects, eliminating the need for manual inspection and repair operations.
Solution Approach 2:
The display panel system performs self-diagnosis and self-repair by automatically detecting its own defect pixels through image capture and processing, then autonomously adjusting the data voltages to compensate for defects without external human intervention.
2Reliability
If complex backplane circuits are used in OLED displays, then display performance is improved, but more spot type/line type display defects occur
Solution Approach 1:
The patent changes the electrical parameters (data voltages) of individual pixels to compensate for defects caused by complex backplane circuits. By adjusting the voltage applied to defect pixels based on captured image data, the system corrects brightness abnormalities without modifying the physical circuit structure.
3Ease of repair
If traditional repair processes are used, then repair can be performed, but the steps are complicated and repair rate is low
Solution Approach 1:
The patent segments the repair process into automated stages: image capture, defect pixel identification through image processing, and individual pixel voltage adjustment. This breakdown transforms a complex manual process into systematic automated operations that can be executed precisely and efficiently.
Data Source
AI summary
A method of repairing a display defect in a display panel includes: in a module process stage, inputting a first data voltage to each pixel in the display panel, enabling the display panel to display an image to be detected, and acquiring a brightness of each pixel; determining a reference pixel and a defect pixel according to the image to be detected; calculating a compensation data voltage for the defect pixel according to a brightness difference between the reference pixel and the defect pixel; and inputting the first data voltage to the reference pixel, and inputting a second data voltage to the defect pixel, according to the compensation data voltage, where the second data voltage is a sum of the first data voltage and the compensation data voltage.