Afterimage Compensator for Display Devices
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Solution Overview
Problem
Display devices, such as OLED and LCD, experience pixel degradation and afterimages when displaying high-luminance images or logos for extended periods, leading to accelerated degradation and image quality deterioration.
Innovation Solution
An afterimage compensator is introduced, comprising a logo detector, blurring determiner, and image corrector, which detects logo areas, determines a blurring area, and blurs only the logo image while maintaining the logo background's luminance and grayscale, using a binary-coded logo map and weighted values to minimize pixel degradation and afterimage occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the logo image is displayed with high luminance for extended periods, then the visibility and clarity of the logo image is improved, but pixel degradation is accelerated and afterimages occur
Solution Approach 1:
The display area is segmented into logo image area and logo background area. Different image processing operations are applied to each segment: the logo image area undergoes blurring to reduce pixel degradation, while the logo background area maintains original image quality. This segmentation allows simultaneous optimization of logo visibility and pixel protection.
Solution Approach 2:
Different quality levels are applied to different regions of the display. The logo image area receives blurring processing with reduced luminance to protect pixels, while the logo background area maintains high luminance and sharpness. This local quality differentiation resolves the contradiction by applying appropriate treatments to specific regions rather than uniformly across the entire display.
2Reliability
If the logo image is blurred to reduce pixel degradation, then afterimage occurrence is reduced, but the visibility and clarity of the logo image deteriorates
Solution Approach 1:
Blurring is applied partially only to the logo image area rather than the entire display. The blur radius and intensity are controlled to be sufficient for pixel protection but limited in scope to maintain overall logo visibility. The logo background remains sharp and clear, compensating for the blurred logo area.
Solution Approach 2:
The luminance parameter of the logo image is dynamically adjusted downward when blurring is applied. By reducing luminance in the blurred region and maintaining normal luminance in the background region, the overall visibility is preserved while the blurring effect protects against afterimages. This parameter change allows simultaneous achievement of pixel protection and visual acceptability.
3Reliability
If the entire logo area including background is blurred, then pixel degradation is reduced, but the image quality and grayscale of the logo background are lost
Solution Approach 1:
The logo area is precisely segmented into logo image sub-area and logo background sub-area using image recognition and thresholding algorithms. This segmentation enables selective application of blurring: the logo image sub-area is blurred for pixel protection, while the logo background sub-area is excluded from blurring to preserve its image quality and grayscale information.
Solution Approach 2:
The logo background area is extracted and excluded from the blurring operation. By identifying and separating the background region from the logo image region, the system applies protective blurring only where necessary (logo image) while preserving the quality of the background area, thus resolving the contradiction between pixel protection and background image quality.
Data Source
AI summary
An afterimage compensator includes: a logo detector configured to detect a logo area including a logo image displayed in a display panel and a logo background image included in a preset range at the periphery of the logo image, based on input image data; a blurring determiner configured to determine a blurring area corresponding to the logo image, using the logo image and the logo background image; and an image corrector configured to blur the logo image, based on the blurring area.