Backlight Region Luminance Control for Display Contrast
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Solution Overview
Problem
Existing display devices with backlights struggle to maintain gradation expression in dark image portions during power saving control, as conventional techniques uniformly reduce backlight luminance, leading to decreased contrast and poor image quality.
Innovation Solution
A display device with a controller that independently adjusts the luminance of multiple backlight regions based on image region luminance, reducing luminance only in regions exceeding a threshold while maintaining it in regions below, thereby optimizing power consumption and image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If uniform backlight luminance reduction is applied for power saving control, then power consumption is reduced, but gradation expression in dark image portions deteriorates
Solution Approach 1:
The backlight is divided into multiple independent light emitting regions that can be controlled separately. Each region's luminance is adjusted based on the luminance requirements of corresponding image regions, allowing selective power reduction in areas where dark portions are not critical while maintaining gradation expression in important dark areas.
Solution Approach 2:
Different luminance reduction strategies are applied to different backlight regions based on local image characteristics. Regions corresponding to dark image portions with important gradation information maintain higher luminance, while other regions can undergo more aggressive luminance reduction for power saving.
2Use of energy by moving object
If backlight luminance is reduced for power saving, then energy consumption decreases, but image contrast deteriorates
Solution Approach 1:
The backlight control is segmented into multiple independently controllable regions. This allows the system to maintain high luminance in regions where contrast is critical for image quality while reducing luminance in regions where contrast is less important, thereby preserving overall image contrast while achieving power savings.
Solution Approach 2:
The system applies different luminance adjustment qualities to different backlight regions based on local image requirements. Regions with high contrast requirements receive minimal luminance reduction, while regions with lower contrast requirements receive greater luminance reduction, optimizing the balance between power consumption and image contrast.
Data Source
AI summary
A display device includes a display panel that displays an image, a backlight that includes a light emitting surface that emits light toward a rear surface of the display panel, the light emitting surface being divided into a plurality of light emitting regions, and a controller that independently determines luminance of the backlight for each of the plurality of light emitting regions according to each luminance of a plurality of image regions in the image respectively corresponding to the plurality of light emitting regions. When the backlight satisfies a predetermined condition, while comparing each determined luminance of the plurality of light emitting regions with a threshold, the controller decreases luminance of a light emitting region having luminance greater than the threshold, and maintains luminance of a light emitting region having luminance not greater than the threshold.