Afterimage Compensator Weighting Strategy for Display Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face issues with displaying images with target luminance due to hysteresis phenomena, leading to instantaneous afterimages, and existing solutions do not effectively address this while minimizing memory usage.
Innovation Solution
A display device with an afterimage compensator that applies weights to input grayscales to generate output grayscales, where the first weight has an initial value greater than 1 for one group and less than 1 for another, converging to 1 over time, and a driving method that uses a look-up table and various calculators to determine these weights based on frame and pixel representative values to minimize afterimage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weights are applied to input grayscales to compensate for hysteresis effects, then afterimage issues are reduced, but device complexity increases
Solution Approach 1:
The input grayscale values are divided into two distinct groups: a first group for which a first weight (greater than 1) is applied, and a second group for which a second weight (less than 1) is applied. This segmentation allows differential compensation strategies for different grayscale ranges, effectively addressing hysteresis-induced afterimages while maintaining a relatively simple compensator architecture.
Solution Approach 2:
The weights are not fixed but are dynamically adjusted based on the difference between current and previous frame grayscale values. When the grayscale difference exceeds a threshold, the corresponding weight is applied; otherwise, no compensation is performed. This dynamic approach enables adaptive afterimage compensation without requiring complex continuous adjustment mechanisms.
2Measurement precision
If frame comparison and weight calculation are performed for all pixels, then afterimage compensation accuracy is improved, but processing time and computational load increase
Solution Approach 1:
Instead of performing weight calculations for all pixels in every frame, the compensator selectively applies weights only to pixels where the grayscale difference between current and previous frames exceeds a predetermined threshold. This partial action approach maintains compensation accuracy for pixels requiring it while significantly reducing unnecessary computational overhead and processing time.
Solution Approach 2:
The patent replaces complex continuous weight adjustment mechanisms with a simplified threshold-based decision system. By substituting gradual mechanical-style adjustment with discrete threshold comparisons and fixed weight applications, the system achieves efficient processing with reduced computational load while maintaining effective afterimage compensation.
Data Source
AI summary
A display device includes an afterimage compensator generating output grayscales by applying at least one of first and second weights to input grayscales when the input grayscales correspond to a still image, and pixels displaying an image based on the output grayscales. The afterimage compensator applies the first weight having an initial value greater than 1 to the input grayscales of a first group, and converges the first weight to 1, and applies the second weight having initial values less than 1 to the input grayscales of a second group, and converges the second weights to 1.