Backlight Control for LCDs via Region-Specific Power Allocation
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Solution Overview
Problem
Conventional LCD screens face issues with high power consumption, low image contrast, and light leakage due to the inability to adjust backlight luminance effectively, which affects the quality of the displayed image.
Innovation Solution
A backlight display control method that identifies salient and non-salient regions in an image using a combination of conventional saliency detection and AI information identification algorithms, dynamically adjusting the backlight power value to enhance contrast and lighting effects while maintaining image quality under power constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight power value is increased to improve image luminance, then the image brightness is improved, but the power consumption increases and the contrast ratio deteriorates
Solution Approach 1:
The backlight is divided into multiple independent backlight units corresponding to different image regions. Each backlight unit can be controlled separately based on the salience of its corresponding image region, allowing selective illumination that reduces overall power consumption while maintaining image quality in important areas.
Solution Approach 2:
Different backlight units are assigned different power values based on the salience detection results. High-salience regions receive higher backlight power to maintain image quality, while low-salience regions receive reduced power to lower overall consumption, creating non-uniform local illumination characteristics.
2Use of energy by moving object
If the backlight power value is reduced to save energy, then the power consumption is decreased, but the image contrast and lighting effect deteriorate
Solution Approach 1:
By segmenting the backlight into multiple controllable units, the system can reduce power in non-critical regions without compromising the illumination quality of salient regions, thus maintaining image contrast while achieving energy savings through selective dimming.
Solution Approach 2:
The system implements local quality control by assigning different power levels to different backlight units based on image salience. Critical regions maintain high illumination for contrast, while non-critical regions are dimmed, preserving overall image quality perception with lower average power consumption.
3Device complexity
If conventional LCD technology is used, then the device structure is simple, but the image contrast is low and light leakage occurs
Solution Approach 1:
The backlight is segmented into multiple independently controllable units that correspond to different image regions. This segmentation enables local dimming capability, allowing the system to achieve high image contrast by turning off or dimming backlight units corresponding to dark image regions while maintaining illumination in bright regions.
Solution Approach 2:
The system introduces dynamic control capability to the backlight, allowing real-time adjustment of each backlight unit's power based on the corresponding image region's salience. This dynamic adaptation enables the display to optimize contrast ratio in real-time without requiring complex hardware modifications to the basic LCD structure.
Data Source
AI summary
A backlight display control method and apparatus are provided. The method includes: obtaining a fused image based on an input image; identifying a salient region and a non-salient region in the fused image; increasing a backlight power value of the salient region; and/or decreasing a backlight power value of the non-salient region. In this way, a region of interest that is for human eyes and that is in the image may be identified, the backlight power value and luminance distribution are controlled based on salience information, the backlight power value is dynamically allocated, and contrast of the region of interest for human eyes is maintained or improved, to improve quality of a displayed image under a same power value constraint; and backlight luminance is adjusted, without weakening image effect, to decrease or increase a backlight power value of a specific region, and thus improve contrast and lighting effect.