Display Device Edge Compensation for OLED Burn-In Reduction
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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, particularly noticeable in split images.
Innovation Solution
A display device with a driving controller that generates edge values and compensation data to reduce luminance in boundary areas, using a high pass filter to identify edge blocks and adjust luminance values across frames to minimize the visibility of afterimages.
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 quality, but burn-in occurs causing afterimages and stains
Solution Approach 1:
The patent applies preliminary action by proactively identifying boundary areas using edge detection algorithms before burn-in occurs. The system calculates edge values for each block based on luminance differences with adjacent blocks, determines boundary areas where edge blocks are continuous in the second direction, and applies luminance compensation in advance. This preventive approach modifies the image data before display to reduce the impact of prolonged static image display, thereby delaying afterimage occurrence while maintaining stable image quality over time.
2Reliability
If luminance compensation is applied to boundary areas, then afterimage occurrence is delayed, but image quality may be affected
Solution Approach 1:
The patent implements local quality by applying luminance compensation selectively only to identified boundary areas rather than uniformly across the entire display. The system determines boundary areas based on edge block continuity in the second direction, then applies compensation data that decreases luminance specifically in these boundary regions. This localized approach minimizes the impact on overall image quality while effectively addressing afterimage resistance in the critical boundary areas where burn-in is most likely to occur.
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.