Data Driving Circuit Degradation Compensation via Dummy Subpixel Sensing
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Solution Overview
Problem
The degradation of circuit elements in subpixels of display devices over time leads to non-uniform driving, resulting in poor display quality due to varying degrees of degradation across different subpixels.
Innovation Solution
A method is implemented where a data driving circuit supplies a driving data voltage to active subpixels and a dummy data voltage, higher than the driving voltage, to dummy subpixels during the display driving period, allowing for real-time sensing of degradation in the dummy subpixels, which generates a compensation table to compensate for the degradation of active subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data driving circuit supplies driving data voltage to light emitting subpixels during display driving, then the display device can maintain normal display function, but circuit elements in subpixels degrade over time causing non-uniform driving and poor display quality
Solution Approach 1:
The patent applies preliminary action by performing degradation sensing and compensation table updates during periods when the display is not actively displaying images. The data driving circuit senses the degree of degradation of circuit elements and updates compensation values in advance, so that when normal display driving resumes, the degradation has already been compensated for, maintaining uniform display quality across all subpixels.
2Measurement precision
If degradation sensing is performed during display driving period, then real-time compensation is possible, but it interferes with normal display operation and reduces productivity
Solution Approach 1:
The patent implements periodic action by alternating between display driving periods and degradation sensing periods. During display driving periods, the data driving circuit supplies driving data voltage to light emitting subpixels for normal display operation. During separate degradation sensing periods, the circuit switches to sensing mode to measure degradation of circuit elements. This periodic switching ensures both display functionality and degradation monitoring are maintained without interfering with each other.
3Measurement precision
If dummy subpixels are added for degradation sensing, then degradation measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the data driving circuit to perform multiple functions: during display driving periods, it supplies driving data voltage to light emitting subpixels for normal display operation; during degradation sensing periods, it supplies dummy data voltage to dummy subpixels and senses degradation of circuit elements. This multi-functional design allows the same hardware circuit to handle both display driving and degradation sensing without requiring separate dedicated circuits, thereby reducing overall device complexity.
Data Source
AI summary
A data driving circuit, controller, and display device include a compensation table for compensating for degradation of a light emitting subpixel. The compensation table may be generated or updated based on degradation of a dummy subpixel. The dummy subpixel is disposed in a non-active area, and has the same or similar characteristics to those of the light emitting subpixel as the display device is driven. Degree of degradation of the dummy subpixel may be sensed, and by degrading the dummy subpixel more rapidly than the light emitting subpixel, accuracy of sensing may be enhanced. The degradation compensation is performed in real time during driving of the display device, and is based on the compensation table generated or updated using the degree of degradation sensed on the dummy subpixel.