Display Panel Static Image Detection for Afterimage Control
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Solution Overview
Problem
Display panels suffer from afterimages when showing the same image for a long time, leading to deteriorated display quality and increased power consumption due to incorrect determination of static images as moving images.
Innovation Solution
A display apparatus determines static images by calculating differences in loads or luminances between previous and present frames for display blocks of each color, using a sensitivity value to accurately identify static images and reduce luminance when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If luminance of display image is decreased to prevent afterimage, then afterimage is prevented and power consumption is reduced, but moving images with little movements or dark overall images are mistakenly determined as static images causing inconvenience to user
Solution Approach 1:
The patent divides the display panel into multiple display blocks and calculates load differences for each block separately. This segmentation allows the system to distinguish between truly static images (where all blocks show no change) and moving images with minor variations (where some blocks show small changes), preventing false positives while maintaining afterimage prevention functionality.
Solution Approach 2:
The patent applies different determination criteria to different display blocks based on their local characteristics. By calculating load differences individually for each display block and comparing against thresholds, the system adapts its sensitivity locally, allowing accurate distinction between static and moving regions without requiring uniform high sensitivity across the entire display.
2Use of energy by stationary object
If luminance is reduced for static images, then power consumption is reduced, but display quality deteriorates when moving images are incorrectly identified as static
Solution Approach 1:
The patent implements a feedback mechanism where the driving controller continuously monitors load differences between frames and adjusts luminance accordingly. By using feedback from the load difference calculation, the system can dynamically determine when to reduce luminance for energy savings and when to maintain it for display quality, preventing power consumption reduction from compromising display quality through incorrect identification.
Data Source
AI summary
A display apparatus includes a display panel, a data driver and a driving controller. The display panel includes a plurality of display blocks. The data driver is configured to output data voltages to the display panel. The driving controller is configured to control the data driver. The driving controller is configured to calculate differences between loads of a previous frame and loads of a present frame for the display blocks for each colors, to determine whether an image is a static image or not based on the differences between the loads of the previous frame and the loads of the present frame for the display blocks for the each colors, and to reduce luminance of the image when the image is determined as the static image.