Display Panel Light Spread Region Compensation for Transistor Reliability
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Solution Overview
Problem
Display devices face issues with light stress, where driving transistors in low gray level pixels are degraded by light emitted from adjacent high gray level pixels, leading to inconsistent brightness due to threshold voltage shifts, especially exacerbated in oxide transistors.
Innovation Solution
A display device and method that detect high gray regions adjacent to low gray regions, set a light spread region based on light spread distance and pixel density, and correct input image data to prevent light stress by increasing gray levels in the light spread region, thereby maintaining consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high gray level pixels emit light to display bright regions, then display brightness is improved, but driving transistors in adjacent low gray level pixels are degraded by light stress
Solution Approach 1:
The patent applies preliminary anti-action by pre-identifying pixels that are adjacent to high gray level regions and predicting which ones are susceptible to light stress. Before the light stress degrades the transistors, the system proactively adjusts the driving current for these identified pixels to compensate for the expected degradation, thereby preventing the harmful effect before it occurs.
Solution Approach 2:
The patent implements preliminary action by performing light stress prediction and compensation in advance during the image processing stage. The controller identifies potential受害 pixels based on the input image data and adjacent high gray level regions, calculates compensation values beforehand, and applies these corrections to the driving current before the actual display occurs, ensuring transistor reliability is maintained.
2Reliability
If light stress is prevented by adjusting pixel gray levels, then transistor reliability is improved, but image data accuracy deteriorates
Solution Approach 1:
The patent applies local quality by selectively adjusting only those pixels that are adjacent to high gray level regions and predicted to be susceptible to light stress, while leaving other pixels unchanged. This localized compensation approach ensures that image data accuracy is preserved in regions not affected by light stress, while reliability is improved only where needed, minimizing information loss.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the driving current parameters for specific pixels based on predicted light stress levels. The controller modifies the current magnitude for identified vulnerable pixels while maintaining original parameters for other pixels, thereby preventing transistor degradation without introducing unnecessary distortions to the overall image data.
3Reliability
If compensation is applied to all pixels, then transistor reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display pixels into different categories: pixels adjacent to high gray level regions that are susceptible to light stress, and pixels that are not. The light stress prediction and compensation processing is applied only to the identified vulnerable segment, rather than uniformly to all pixels, thereby reducing processing complexity while maintaining reliability where it matters.
Solution Approach 2:
The patent implements partial action by applying light stress compensation only to the extent necessary - specifically to pixels adjacent to high gray level regions that are predicted to be affected. Rather than applying excessive compensation to all pixels, the system performs partial processing on the relevant subset, reducing overall device complexity while achieving the reliability improvement goal.
Data Source
AI summary
A display device including: a display panel including pixels; a controller configured to receive input image data, to detect a high gray region adjacent to a low gray region in an image represented by the input image data, to set at least a portion of the low gray region adjacent to the high gray region as a light spread region based on a light spread distance or a pixel density of the display panel, and to generate output image data by correcting the input image data for the light spread region; and a data driver configured to provide data voltages to the pixels based on the output image data.