Display Pixel Degradation Sensing and Compensation
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Solution Overview
Problem
Display devices face challenges in accurately sensing and compensating for degradation in driving transistors, particularly in threshold voltages and mobilities, which affects image display quality.
Innovation Solution
A display device and method that involve a controller generating compensation data based on sensing data from threshold voltages, mobilities, and mobility changes of driving transistors during specific sensing periods, allowing for accurate compensation of input image data to maintain optimal transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensing periods and multiple types of compensation data are generated to accurately sense degradation of driving transistors, then the accuracy of compensation is improved, but the complexity of the control system increases
Solution Approach 1:
The sensing process is divided into multiple distinct sensing periods (first sensing period for threshold voltage and mobility, second sensing period for mobility change during image display). Each sensing period targets specific degradation parameters, allowing the system to accurately measure different aspects of transistor degradation separately. This segmentation enables comprehensive degradation sensing while maintaining manageable system complexity through structured, phased measurement approaches.
Solution Approach 2:
The first sensing period is performed before image display to pre-characterize the driving transistors' threshold voltages and mobilities. This preliminary sensing establishes baseline compensation data (first compensation data and second compensation data) that is used to compensate image data during subsequent display operations. By performing this initial characterization in advance, the system reduces the complexity of real-time compensation during active display.
2Measurement precision
If compensation data is generated based on sensing during multiple periods including during image display, then the compensation accuracy for mobility changes is improved, but the time required for sensing and processing increases
Solution Approach 1:
The system implements periodic sensing operations structured in distinct phases: a first sensing period for initial characterization, followed by a second sensing period during image display for mobility change detection. This periodic structure allows the system to balance accurate degradation sensing with efficient time management by performing comprehensive measurements at appropriate intervals rather than continuously, thus improving mobility change sensing accuracy while controlling processing time.
3Measurement precision
If first compensation data and second compensation data are used to compensate image data for sensing, then the accuracy of subsequent mobility sensing is improved, but the complexity of data processing increases
Solution Approach 1:
The first compensation data (for threshold voltages) and second compensation data (for mobilities) are fed back into the system to compensate image data before subsequent sensing operations. This feedback mechanism uses the previously acquired compensation information to improve the accuracy of mobility sensing in the second sensing period. The compensated image data serves as a reference that enhances the precision of degradation measurement while the systematic application of feedback data maintains manageable processing complexity through structured compensation algorithms.
Data Source
AI summary
A display device including pixels; a controller configured to generate first compensation data based on first sensing data with respect to threshold voltages of driving transistors of the pixels which are sensed during a first sensing period, to generate second compensation data based on second sensing data with respect to mobilities of the driving transistors of the pixels which are sensed during the first sensing period, to generate third compensation data based on third sensing data with respect to mobility change amounts of the driving transistors of the pixels which are sensed using image data for sensing compensated based on the first and second compensation data during a second sensing period, and to compensate input image data based on the first, second, and third compensation data to generate compensated image data; and a data driver configured to provide data voltages to the pixels based on the compensated image data.