LCD Backlight Dimming Control for Fast-Motion Image Luminance
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Solution Overview
Problem
Existing liquid crystal display devices face issues with motion data and current linkage to backlight dimming, leading to uniform reduction of backlight signal duty and current, resulting in darkened images, especially for fast-moving content.
Innovation Solution
A display device with a controller that obtains motion values for local images, calculates a global dimming value based on motion sum, and adjusts backlight signal duty and current accordingly to enhance image sharpness and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the duty of the signal supplied to the backlight is uniformly reduced by a certain ratio, then energy consumption is reduced, but the image becomes very dark
Solution Approach 1:
The patent applies local quality by dividing the backlight into multiple local blocks and controlling each block independently based on motion data. Instead of uniformly reducing duty across the entire backlight, the controller adjusts duty locally - reducing it in areas with low motion activity while maintaining higher duty in areas with fast motion, thus saving energy without darkening the overall image
Solution Approach 2:
The patent implements dynamics by making the backlight duty adaptive rather than static. The controller dynamically adjusts the duty of each backlight block based on real-time motion data analysis, changing the duty ratio according to the motion speed and direction of images in different local regions, thereby optimizing energy consumption while maintaining image quality
2Loss of energy
If the current supplied to the backlight is changed to reduce power consumption, then energy efficiency improves, but the image sharpness and luminance are compromised
Solution Approach 1:
The patent applies local quality by controlling current independently for each backlight block based on local motion characteristics. Areas with fast motion maintain higher current levels to preserve image sharpness, while areas with slow or no motion use reduced current to save power, achieving both energy efficiency and image quality
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the current supplied to different backlight blocks based on motion data. The controller modifies current parameters adaptively - increasing current for blocks displaying fast-moving images to maintain sharpness, and decreasing current for blocks with static or slow-moving content to reduce power consumption
3Loss of energy
If global dimming uniformly reduces the backlight signal duty, then power consumption decreases, but fast-moving images become dark and lose sharpness
Solution Approach 1:
The patent resolves this contradiction by replacing uniform global dimming with local dimming control. Each backlight block's duty is independently adjusted based on the motion characteristics of images in that specific local region, ensuring that fast-moving images maintain adequate brightness and sharpness while still achieving overall power savings in less demanding areas
Solution Approach 2:
The patent implements dynamics by making the dimming control adaptive to local motion conditions rather than applying a static global dimming ratio. The controller continuously monitors motion data and dynamically adjusts the duty of each backlight block accordingly, maintaining image quality consistency across different motion scenarios while optimizing power consumption
Data Source
AI summary
According to an embodiment of the present disclosure, a display device may comprise a liquid crystal display panel configured to display an image; a backlight including a plurality of backlight blocks configured to provide a light to the liquid crystal display panel, wherein each of the plurality of backlight blocks includes a plurality of light sources; and a controller configured to obtain a plurality of motion values corresponding to each of a plurality of local images constituting the image, obtain a motion sum value of the image by summing the plurality of obtained motion values, and determine a global dimming value based on the obtained motion sum value.