Source Driver Image Sticking Mitigation
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Solution Overview
Problem
Self-luminescence displays, such as OLEDs, suffer from reduced lifespan due to image sticking effects when displaying the same image for a long period, leading to premature degradation of luminiferous elements.
Innovation Solution
A source driver with a judgment unit, image processing unit, and digital-to-analog converter is used to encode input images, generate a luminance controlling signal, and apply algorithms to reduce pixel brightness or share brightness among pixels, thereby minimizing the display of static images and extending pixel lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-luminescence displays continuously display the same image, then the display function is maintained, but the lifespan of luminiferous elements is reduced due to image sticking effect
Solution Approach 1:
The patent applies periodic action by alternately displaying the original image and the adjusted image (with modified luminance values) in time-division multiplexing manner. This periodic switching prevents continuous exposure of the same pixels to identical luminance levels, thereby mitigating the image sticking effect while maintaining display functionality.
Solution Approach 2:
The patent changes the luminance parameters of certain pixels by adjusting their drive voltages or current values to create an adjusted image with different luminance distribution. This parameter modification redistributes the stress on luminiferous elements, preventing any single region from being continuously overworked and thus extending overall display lifespan.
2Reliability
If image processing algorithms are applied to reduce pixel brightness, then pixel lifespan is extended, but display quality may be compromised
Solution Approach 1:
The patent applies image processing algorithms selectively rather than uniformly to all pixels. Only specific pixels that are at risk of image sticking (based on historical display data or luminance thresholds) undergo luminance adjustment, while other pixels maintain their original display characteristics. This partial application preserves overall display quality while protecting vulnerable regions.
Solution Approach 2:
The patent creates a copy of the original image and applies luminance adjustments to this copied version, then displays both the original and adjusted images in alternation. This copying approach allows the system to maintain the original high-quality image for reference while using the adjusted copy to mitigate image sticking, thus preserving display quality while extending pixel lifespan.
Data Source
AI summary
A source driver providing an output image to a plurality of pixels and including a judgment unit, an image processing unit, and a digital-to-analog converter is disclosed. The judgment unit encodes a first input image to generate an encoded code and compares the encoded code with a preset code to generate a luminance controlling signal. The image processing unit processes an image signal by an algorithm and outputs the processed result when the judgment unit asserts the luminance controlling signal. The image processing unit directly outputs the image signal when the judgment unit un-asserts the luminance controlling signal. The digital-to-analog converter transforms the output of the image processing unit and outputs the transformed result to the pixels.