OLED Display Burn-In Mitigation via Pixel Shifting
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Solution Overview
Problem
Organic light-emitting diode (OLED) display elements experience variations in luminance due to deterioration, leading to the 'image burn-in' phenomenon, where specific pixels accumulate longer lighting times, causing uneven degradation and luminance variations.
Innovation Solution
A display device with an image processing circuit and control circuit that switches between different text modes, such as black and white text modes, and shifts text or icons to equalize accumulated lighting times across pixels, thereby reducing differences in deterioration and suppressing image burn-in.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific display pattern is fixedly displayed in a specific region, then the display function is simple and reliable, but the accumulated lighting time of pixels becomes uneven causing image burn-in
Solution Approach 1:
The patent applies dynamics by making the display pattern movable rather than fixed. The text or image is shifted to a different position in the display region at predetermined intervals, causing different pixels to accumulate lighting time more evenly. This dynamic repositioning prevents any single pixel from being continuously illuminated, thereby suppressing image burn-in while maintaining display reliability.
Solution Approach 2:
The patent implements periodic action by shifting the display pattern at predetermined time intervals. This periodic repositioning ensures that pixels that were previously illuminated are given rest periods, while new pixels take over the illumination duty. This cyclical redistribution of lighting time across different pixel groups equalizes cumulative exposure and prevents localized deterioration.
2Device complexity
If the same gray scale is continuously displayed, then the display control is simple, but the deterioration of display elements becomes uneven across pixels
Solution Approach 1:
The patent applies dynamics by continuously or periodically changing the gray scale values displayed in different regions. Instead of maintaining a static gray scale distribution, the system dynamically adjusts which pixels display which gray scale levels, ensuring that no single group of pixels is continuously subjected to the same high-intensity illumination conditions that cause uneven deterioration.
Solution Approach 2:
The patent implements parameter changes by varying the gray scale parameters across different display regions and over time. By changing the luminance levels and distribution patterns of gray scales, the system redistributes the stress on display elements, preventing any particular pixel group from experiencing consistent high-level illumination that would lead to non-uniform deterioration.
3Ease of operation
If text is displayed in a fixed position, then the readability is high, but the pixel accumulated lighting time becomes uneven
Solution Approach 1:
The patent applies dynamics by making the text position dynamic rather than fixed. The text is shifted to different positions within the display region at predetermined intervals, which redistributes the lighting time across different pixel groups. This dynamic repositioning maintains readability over the long term by preventing any single pixel from being continuously illuminated, while still providing clear text display at any given moment.
Solution Approach 2:
The patent implements periodic action by shifting the text position at regular time intervals. This periodic repositioning ensures that pixels in the original text position are given rest periods, while new pixels assume the text display function. The periodic nature of this shifting equalizes the cumulative lighting time across different pixel groups, preventing image burn-in while maintaining text readability during each display interval.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces variations in light emission across pixels, minimizing the image burn-in phenomenon by equalizing accumulated lighting times and distributing pixel deterioration, thus enhancing the display's longevity and visibility.
Implementation Method 1
a so-called self-light emitting display device having a pixel which is comprised of a display element such as a light emitting diode (LED), namely, a light emitting device has been attracting attention. As a display element used for such a self-light emitting display device, an organic light emitting diode (OLED, also referred to as an organic EL element, an electroluminescence (EL) element, or the like) has been attracting attention
Data Source
AI summary
In a display element such as an organic EL element, deterioration progresses due to light emission, and emission luminance is lowered even if the same voltage is applied to the display element. Therefore, use over time causes variations in luminance of each pixel, thereby a so-called “image burn-in” phenomenon occurs. Given this factor, the invention provides a display device which can reduce the difference in deterioration of a display element in each pixel and suppress variations in light emission of a display element in a pixel. It is prevented that only a specific pixel has a long accumulated lighting time. For that purpose, a gray scale of a display pattern is changed to prevent the difference in deterioration of display element in pixels from increasing. Alternatively, a specific display pattern is prevented from being fixedly displayed in a specific region. Further alternatively, a pixel lagging behind in deterioration is deteriorated so that the accumulated lighting time of pixels is equal to each other.