Display Panel Boundary Compensation for OLED Burn-In
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Solution Overview
Problem
Organic light emitting display devices experience afterimages or stains due to burn-in when displaying images with vertical boundaries for extended periods, leading to visibility issues.
Innovation Solution
A display device and method that generate compensation data to adjust luminance levels based on edge detection and boundary areas, reducing luminance in specific areas to delay afterimage formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the organic light emitting display device displays the same image for a long period of time, then the display device maintains stable image output, but afterimages or stains appear due to burn-in of the organic light emitting diode
Solution Approach 1:
The system performs preliminary detection of boundary areas in the image data before displaying the image. By identifying regions with high edge density or luminance differences in advance, the system can pre-apply compensation values to these areas, preventing burn-in effects before they occur during prolonged display.
Solution Approach 2:
Instead of uniformly adjusting the entire image, the system applies different compensation strategies to specific local areas identified as boundary regions. By calculating edge values and determining boundary areas with high luminance differences, the system selectively modifies only the problematic regions that are prone to afterimages, preserving the quality of other areas.
2Shape
If the display device displays a split image with a vertical boundary, then the image content is clearly divided, but a visible afterimage line appears at the boundary
Solution Approach 1:
The system detects and marks boundary areas before image display by analyzing edge values and luminance differences. This preliminary identification allows the system to pre-calculate compensation values for boundary regions, ensuring that when the split image is displayed, the boundary areas are already protected against afterimage formation.
Solution Approach 2:
The system applies targeted compensation only to the boundary areas where vertical lines or sharp transitions exist. By calculating edge values in the first direction and identifying continuous edge blocks in the second direction, the system locally adjusts luminance in these specific regions without affecting the overall image quality or the clarity of the split image boundaries.
3Reliability
If the display device decreases luminance in boundary areas to prevent afterimages, then afterimage occurrence is delayed, but the image luminance uniformity is reduced
Solution Approach 1:
The system maintains luminance uniformity in non-boundary areas while applying selective luminance adjustment only in identified boundary regions. By using edge detection and continuity analysis to precisely locate boundary areas, the system ensures that compensation is applied locally where needed, preserving the overall uniformity and visual quality of the majority of the image.
Solution Approach 2:
The system applies compensation values that may exceed what is strictly necessary for afterimage prevention, particularly in boundary areas with high luminance differences. This excessive action in localized regions ensures robust protection against afterimages while the majority of the image maintains its original luminance characteristics, achieving a balance between protection and uniformity.
Data Source
AI summary
A display device includes a driving controller which generates output image data based on input image data, a data driver which generates data voltages based on the output image data, and a display panel which displays an image based on the data voltages. The driving controller may generate a plurality of edge values in a first direction for a plurality of blocks based on a plurality of luminance values for the plurality of blocks that are dividing the display panel, determine a boundary area in the first direction based on a continuity of edge blocks in a second direction crossing the first direction, the edge blocks being determined based on the plurality of edge values, and generate the output image data based on the input image data and compensation data for decreasing a luminance of the image corresponding to the boundary area.