Timing Controller Scene Change Luminance Reduction
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Solution Overview
Problem
Existing organic light-emitting display devices reduce luminance based on average grayscale levels, leading to inefficient power consumption as they incorrectly identify non-still images as still images and only reduce luminance in still images, which is rare in typical viewing environments.
Innovation Solution
A timing controller that determines scene changes in video data and reduces luminance to the maximum extent within a scene section until a scene change occurs, using a scene change algorithm like histogram matching to maintain image quality and efficiently decrease power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If luminance is reduced based on average grayscale level (APL) to decrease power consumption, then power consumption is reduced, but image quality deteriorates because non-still images are incorrectly identified as still images
Solution Approach 1:
The patent changes the parameter used for still image detection from average grayscale level (APL) to histogram-based scene change detection. By comparing histogram distributions between frames rather than relying on APL thresholds, the system accurately identifies actual scene changes while maintaining the ability to reduce luminance during genuine still periods, thus preserving image quality while achieving power savings.
Solution Approach 2:
The patent replaces the simple APL-based detection mechanism with a more sophisticated histogram comparison mechanism. This substitution enables more accurate scene change detection by analyzing the distribution of pixel intensity values across the entire image, rather than relying on a single averaged value, thereby preventing false identification of moving images as still images.
2Use of energy by moving object
If luminance is reduced only in still images to save power, then power consumption decreases, but the power consumption reduction efficiency is low because still images are rare in typical viewing environments
Solution Approach 1:
The patent implements dynamic luminance adjustment based on continuous scene change detection. Instead of statically reducing luminance only for detected still images, the system dynamically adjusts luminance in real-time based on ongoing histogram comparisons, enabling continuous power savings during actual still periods while quickly recovering when scenes change, thereby improving overall power consumption reduction efficiency.
Solution Approach 2:
The patent maintains continuous scene change detection and luminance adjustment operations. The histogram comparison process runs continuously across frame boundaries, and luminance adjustment is applied continuously during detected still periods rather than in discrete steps, ensuring maximum power savings are achieved whenever still conditions exist without missing brief still periods.
3Use of energy by moving object
If luminance is reduced in images determined not to be still images, then power consumption decreases further, but image quality deteriorates due to incorrect luminance reduction
Solution Approach 1:
The patent implements a feedback mechanism where histogram comparison results directly control luminance adjustment decisions. The system continuously monitors scene change conditions through histogram analysis and provides feedback to the luminance adjustment module, ensuring luminance is reduced only when the feedback indicates genuine still conditions, thereby preventing incorrect luminance reduction and preserving image quality.
Data Source
AI summary
Disclosed are a timing controller, a driving method thereof, and a display device using the same. The timing controller includes a memory configured to sequentially store input video data of respective frames, a determiner configured to compare the input video data of respective frames to determine whether a scene is changed, and a converter configured to, when it is determined by the determiner that the scene is changed, in the same scene section until the scene is changed and then changed to another scene, reduce luminance of the input video data included in the scene section, and output image data with reduced luminance.