Display Data Driver Voltage Sensing Compensation
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Solution Overview
Problem
Display devices employing a dual scan technique face luminance differences between display regions due to varying current-resistance drops, leading to uneven brightness across the panel.
Innovation Solution
A display device and method that utilize a storage capacitor to sense local voltage levels and generate data signals based on these voltages, ensuring pixels emit light with consistent luminance by compensating for voltage differences across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a dual scan technique is employed to increase driving time and compensation time, then the driving time and compensation time are improved, but luminance uniformity deteriorates due to different current-resistance drops in respective display regions
Solution Approach 1:
The patent applies local quality by sensing the local voltage level at each pixel location and using this local information to compensate for the specific current-resistance drop at that location. The storage capacitor stores the locally sensed voltage level, and the data driver uses this local information to generate compensated data signals, ensuring each pixel receives appropriate compensation for its specific position in the display panel.
Solution Approach 2:
The patent implements feedback by sensing the actual voltage level at each pixel location through the storage capacitor and using this sensed information to adjust and compensate the data signal. The data driver receives the sensing signal representing the local voltage level and generates a compensated data signal that accounts for the measured voltage drop, creating a closed-loop compensation system.
2Duration of action of moving object
If different scan signals are used in respective display regions to implement dual scan, then driving time is increased, but current-resistance drop varies across regions causing luminance difference
Solution Approach 1:
The patent changes the parameter being compensated by transitioning from compensating for fixed line resistance to compensating for actual voltage level differences. By sensing and compensating for the voltage level (which inherently accounts for both line resistance and current effects), the system achieves more accurate compensation that adapts to the actual electrical conditions at each pixel location.
Data Source
AI summary
A display device includes a power supplier that generates a first power voltage, a display panel that includes a pixel generating a sensing signal by sensing a local voltage level of the first power voltage using a storage capacitor, and a data driver that generates a data signal based on image data and the sensing signal.