Display Panel Brightness Control for Afterimage Reduction
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Solution Overview
Problem
Current organic electroluminescent light emitting display devices suffer from afterimages, which degrade image quality and have high power consumption, necessitating a solution to reduce these issues.
Innovation Solution
A display apparatus and method that includes a timing controller to process image data, detect variations in image brightness across the display panel, and adjust the brightness based on differences between frames, using a count value to generate control signals that reduce the intensity of still images and thereby minimize afterimages and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness of the display panel is maintained at high levels to ensure image quality, then image display quality is improved, but power consumption increases and afterimages occur
Solution Approach 1:
The patent implements dynamic brightness control by continuously monitoring image data and adjusting the display panel's brightness in real-time. The controller adapts the brightness level based on the actual image content being displayed, transitioning from static high brightness to dynamic adaptive brightness, thereby reducing power consumption while maintaining image quality when needed.
Solution Approach 2:
The patent changes the brightness parameter of the display panel based on image analysis. By calculating statistics (such as average brightness or contrast metrics) from the image data and comparing them against thresholds, the system adjusts the brightness parameter dynamically, reducing it when the image content allows, thus lowering power consumption without permanently compromising image quality.
2Illumination intensity
If the brightness of the display panel is maintained at high levels to ensure image quality, then image display quality is improved, but afterimages occur
Solution Approach 1:
The patent applies dynamic brightness adjustment to prevent afterimages by continuously adapting the brightness level based on the displayed image content. When the image statistics indicate low contrast or specific brightness ranges that are prone to causing afterimages, the system dynamically reduces brightness, thereby eliminating the harmful effect while preserving image quality in appropriate conditions.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously analyzes image data statistics and uses this information to adjust the display panel's brightness. This closed-loop control ensures that brightness adjustments are made in response to actual image content, preventing afterimages by adapting to conditions that would otherwise cause them, while maintaining optimal image quality.
3Use of energy by moving object
If the brightness of the display panel is dynamically adjusted based on image data analysis, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the image processing task into distinct stages: image data reception, statistic calculation, threshold comparison, and brightness control. This modular approach divides the complex controller functionality into manageable segments, making the system easier to implement and maintain while achieving dynamic brightness adjustment and power savings.
Solution Approach 2:
The patent applies partial action by performing brightness adjustment only when image statistics indicate it is necessary. Rather than continuously adjusting brightness or implementing complex algorithms, the system uses simple threshold-based decisions on key image statistics, achieving power savings with minimal additional complexity by acting only when needed.
Data Source
AI summary
In a display apparatus and a driving method thereof, image data corresponding to plural different positions of a display panel are added to each other, and a sum of the image data of a present frame is compared with a sum of the image data of a previous frame to determine whether an image displayed on the display panel is a still image or not. While a still image is displayed, brightness of the display panel is gradually lowered. Accordingly, the display panel may prevent occurrence of afterimages and deterioration of organic electroluminescent light emitting devices, as well as reduce power consumption.