OLED Pixel Compensation Curves for Aging Stress

The patent segments the compensation approach by dividing pixels into different groups based on their stress conditions (e.g., high stress, low stress groups). Each group is assigned a specific compensation curve extracted from reference pixels experiencing similar stress conditions. This segmentation enables accurate compensation for each pixel's specific aging characteristics without requiring a single complex universal model, thus resolving the contradiction between system complexity and measurement precision.

The patent applies local quality by creating compensation curves tailored to specific local stress conditions experienced by different pixels. Each compensation curve is locally optimized for pixels in particular stress groups (e.g., high stress, low stress), rather than using a single global curve. This local optimization improves measurement precision and compensation accuracy for each pixel's specific operating conditions while managing overall system complexity through targeted rather than universal approaches.

The patent implements preliminary action by extracting and storing compensation curves from reference pixels during manufacturing or initialization phases, before the display enters normal operation. These pre-extracted curves are stored in memory for later retrieval and application during display operation. This preliminary extraction of aging characteristics eliminates the need for real-time curve calculation during display refresh, thereby maintaining high reliability of aging data while preserving display productivity and refresh rate performance.