AMOLED Display Luminance Uniformity Detection and Repair
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Solution Overview
Problem
Current methods for detecting and repairing Mura defects in AMOLED display devices are inefficient and subjective, leading to inconsistent results and reduced product yield due to reliance on visual inspection rather than objective luminance measurement.
Innovation Solution
A detecting apparatus and method that divides the screen into detection regions, sequentially illuminates them, and acquires detection currents to identify defective regions based on current ratios, followed by a repairing apparatus that performs current compensation using the current density of normal regions to correct luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect Mura defects, then the detection process is simple, but the detection accuracy and consistency are poor
Solution Approach 1:
The patent replaces the mechanical visual inspection system with an automated optical-electrical measurement system. The luminance detection apparatus uses an illuminating device to illuminate detection regions and a luminance meter to objectively measure luminance values, converting subjective visual assessment into quantifiable electrical signals for accurate defect detection.
2Measurement precision
If the screen is divided into multiple detection regions for sequential illumination, then the detection precision is improved, but the detection time increases
Solution Approach 1:
The patent divides the screen into multiple detection regions that are sequentially illuminated and measured. This segmentation allows the system to focus measurement resources on specific regions, improving the precision of luminance measurements while managing the overall detection time through systematic sequential processing of each region.
Solution Approach 2:
The patent employs periodic sequential illumination of different detection regions followed by measurement cycles. This periodic action pattern allows the system to systematically cover the entire screen while maintaining measurement precision, balancing the trade-off between comprehensive detection and time consumption.
3Manufacturing precision
If current compensation is performed on defective regions, then the luminance uniformity is improved, but the repair process complexity increases
Solution Approach 1:
The patent applies local quality adjustment by performing current compensation specifically on identified defective regions rather than the entire screen. The system determines the luminance difference between defective and normal regions, then applies targeted current compensation to restore uniformity, making the repair process more efficient and manageable despite the added complexity.
Data Source
AI summary
A detecting apparatus and method, repairing apparatus and method, and repairing system of AMOLED display device are provided. The detecting apparatus includes: an illuminating device for sequentially illuminating a plurality of detection regions of a screen of the AMOLED display device, the screen being divided into the plurality of detection regions, each of the detection regions including at least one light-emitting unit; a current detecting device for acquiring a detection current which is a sum of driving currents of the light-emitting unit in the detection region being illuminated; and a judging device for judging whether the detection region corresponding to the detection current is a defective region according to the detection current. The apparatus can detect luminance uniformity of the AMOLED display device. The detection efficiency is high, the detection standard is unified and the detection accuracy is high.