Display Burn-In Prevention via Frame Mixing
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Solution Overview
Problem
Displays such as CRT, plasma, and LCD are prone to burn-in when showing static images for extended periods, leading to objectionable patterns when the display changes, which is particularly concerning for expensive video monitors and projectors.
Innovation Solution
A system and method are introduced to modify the video processing pipeline by adding an image sampler, static area detector, and burn-in prevention module to identify and address static areas, applying techniques like blacking out, reverse pixel patterns, or blur filters to prevent burn-in in MPEG and non-MPEG environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If static images are displayed for extended periods, then the display can maintain stable and clear image quality, but burn-in occurs leading to permanent image retention
Solution Approach 1:
The patent applies periodic action by introducing frame mixing that periodically alters the display of static images. The system mixes current and previous frames with controlled probability, creating periodic changes in the displayed content while maintaining overall image stability. This periodic intervention prevents burn-in by ensuring that no single static image is displayed continuously for extended periods.
Solution Approach 2:
The patent implements dynamics by transforming the static display into a dynamic process through frame mixing. The mixing probability parameter controls the degree of dynamic change, allowing the display to adapt between stability and change. This dynamic approach enables the system to maintain image quality while preventing permanent image retention through controlled temporal variations.
2Reliability
If frame mixing is applied to prevent burn-in, then display reliability is improved, but image quality may deteriorate due to potential blurring or artifacts
Solution Approach 1:
The patent applies parameter changes by introducing a mixing probability parameter that controls the extent of frame mixing. This parameter can be adjusted to optimize the balance between burn-in prevention and image quality. By changing the mixing probability, the system can adapt to different display conditions and content types, maintaining reliability while minimizing quality degradation through controlled parameter adjustment.
Solution Approach 2:
The patent implements local quality by applying frame mixing selectively rather than uniformly across all pixels. The technique allows different regions of the image to be mixed with different probabilities or patterns, preserving important static elements while preventing burn-in in areas most susceptible to image retention. This localized approach maintains overall image quality while providing targeted burn-in prevention.
3Duration of action of stationary object
If frame mixing is used to prevent burn-in, then the lifespan of display devices is extended, but the complexity of the video processing pipeline increases
Solution Approach 1:
The patent applies preliminary action by performing frame mixing operations in advance before the mixed frames are displayed. The system prepares the mixed frame data ahead of time, storing it in buffer memory, so that the actual display process remains simple and straightforward. This preliminary processing approach extends display lifespan through burn-in prevention while keeping the real-time display pipeline relatively simple and efficient.
Solution Approach 2:
The patent introduces an intermediary component (the frame mixing module with buffer memory) that sits between the video source and the display device. This intermediary handles the complex mixing operations, allowing the rest of the video processing pipeline to remain relatively simple. The intermediary absorbs the added complexity, enabling lifespan extension through burn-in prevention without significantly complicating the overall system architecture.
Data Source
AI summary
A system and method for the prevention of display burn-in in Motion Picture Experts Group (MPEG) and non-MPEG environments. In one environment, a system may include an image sampler to sample images from a decoded video stream; a static area detector to successively compare the sampled images using a pixel-wise XOR operation, where the static area detector marks an area in the compared images that appear as zero brightness; and a burn-in prevention module to apply a burn-in preventative technique for a period of time to the marked area.