OLED Display Burn-In Prevention via Image Enlargement and Cropping
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience burn-in due to fixed patterns, and existing orbit algorithms to mitigate this issue cause edge pixels to appear black, increasing the perceived bezel size as the image moves on the screen.
Innovation Solution
A display device and image processing method that enlarges an input image, crops it to fit the screen, and periodically changes the cropping area to move the fixed pattern, preventing burn-in and eliminating black edges by ensuring pixel data is always present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an orbit algorithm is used to prevent burn-in by moving fixed patterns on the screen, then burn-in prevention is improved, but edge pixels appear black and the bezel seems to increase
Solution Approach 1:
The patent transitions from a 1D movement approach (moving image left-right or up-down) to a 2D enlargement approach where the image is scaled up and positioned within the screen area. This dimensional change allows the image to occupy more screen real estate while maintaining proper pixel data coverage at all edges, eliminating the black edge phenomenon while still achieving burn-in prevention through periodic repositioning.
Solution Approach 2:
The patent changes the scaling parameter of the displayed image from 100% (original size) to an enlarged size (greater than 100%). This parameter change allows the image to be larger than the screen dimensions, enabling the system to crop and reposition portions of the enlarged image to prevent burn-in without creating black edges, since the enlarged image provides sufficient pixel data coverage for all screen areas.
2Reliability
If an image of the same size as the screen is moved to prevent burn-in, then pixel degradation is dispersed, but there is no pixel data in edge pixels causing black areas to appear
Solution Approach 1:
The patent performs preliminary enlargement of the image before displaying it on the screen. By pre-enlarging the image to a size greater than the screen dimensions, the system ensures that sufficient pixel data exists for all screen areas including edges and corners. This preliminary action prevents the loss of pixel data information that would otherwise occur when moving a same-size image around the screen.
Data Source
AI summary
The present invention relates to a display device and a method for image processing thereof, in which an input image is enlarged and a part of the enlarged image is selected as an image to be displayed on the screen of a display panel, and it is possible to thereby prevent screen burn-in and to prevent a phenomenon in which pixel data is not present and thus a pixel appears black when an image is moved on the screen.