Display Panel Block Analysis for Dynamic Afterimage Prevention
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Solution Overview
Problem
Organic light emitting display devices experience lifespan differences across pixels, leading to afterimages and potential burn-in due to fixed images being displayed for extended periods.
Innovation Solution
A display device controller divides image data into blocks, determines fixed or moving images based on inter-frame variation, and adjusts an afterimage prevention operation mode by accumulating or subtracting stack values for blocks exceeding a threshold, changing luminance levels to prevent afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fixed images are displayed for extended periods, then image quality is maintained, but afterimages and burn-in occur due to pixel lifespan differences
Solution Approach 1:
The patent applies dynamics by transitioning from static image display to dynamic image adjustment. The controller dynamically adjusts operation modes based on real-time detection of fixed image conditions, switching between normal mode and afterimage prevention mode to adapt to changing display conditions and prevent afterimages.
Solution Approach 2:
The patent implements feedback through a detection mechanism that continuously monitors inter-frame variation to identify fixed images. When fixed images are detected, the system provides feedback to the controller, which then activates afterimage prevention operations to counteract the harmful effects of prolonged static display.
2Duration of action of stationary object
If afterimage prevention operation mode is activated, then display panel lifetime is extended, but processing complexity increases due to block division and stack value calculation
Solution Approach 1:
The patent applies segmentation by dividing the image into multiple blocks for independent analysis. This allows the system to process only relevant portions of the image data, reducing overall processing complexity while maintaining effective afterimage prevention across the entire display panel.
Solution Approach 2:
The patent implements preliminary action by calculating stack values in advance for each block based on inter-frame variation. This pre-computation allows the system to quickly determine when afterimage prevention mode should be activated, reducing real-time processing burden and extending display panel lifetime.
3Reliability
If stack values are accumulated for blocks displaying fixed images, then afterimages are prevented, but processing time increases due to continuous monitoring
Solution Approach 1:
The patent applies periodic action by monitoring inter-frame variation at specific intervals rather than continuously. The controller periodically compares current frame data with previous frame data to detect fixed images, which reduces processing time while maintaining effective afterimage prevention through consistent periodic monitoring.
Data Source
AI summary
Disclosed is a display device, which includes a display panel that displays an image, and a controller that receives image data corresponding to a frame and drives the display panel. The controller divides the image data into a plurality of blocks and determines whether the image is a fixed image based on an inter-frame variation of a block of the plurality of blocks. The controller changes an afterimage prevention operation mode when the number of blocks displaying the fixed image for a period equal to or greater than a first reference value among the plurality of blocks is equal to or greater than a second reference value.