Region-Based Backlight Luminance Adjustment for Power Efficiency
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Solution Overview
Problem
Conventional display devices waste electrical power due to a constant backlight luminance that cannot be effectively adjusted for images with varying brightness levels across different regions, leading to inefficient power usage.
Innovation Solution
A region-based image display device with a backlight module divided into adjustable luminance units, a separating unit to divide input image signals into region-specific signals, and a modulation unit to adjust luminance values based on image region signals, ensuring chromaticity and brightness consistency across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the backlight module uses constant luminance, then the display can maintain uniform brightness across the entire display area, but electrical power is wasted when displaying images with low brightness
Solution Approach 1:
The backlight module is divided into multiple independently controllable backlight regions (e.g., first backlight region, second backlight region, etc.), each with its own luminance unit that can be adjusted separately based on the brightness requirements of different image regions
Solution Approach 2:
Different backlight regions are assigned different luminance values according to the brightness characteristics of their corresponding image regions, allowing high-brightness regions to receive higher luminance while low-brightness regions receive lower luminance, optimizing power consumption locally
2Adaptability or versatility
If the backlight module uses adaptive dynamic image control to adjust whole luminance, then power consumption is reduced, but different parts of the image with different gray scale values cannot be displayed by different luminance values simultaneously
Solution Approach 1:
The backlight module is segmented into multiple independently controllable regions, allowing different luminance values to be applied to different spatial regions simultaneously, enabling the system to handle images with varying brightness levels across different areas
Solution Approach 2:
The luminance of each backlight region can be dynamically adjusted in real-time based on the brightness characteristics of the corresponding image region, providing adaptive control that responds to local image requirements rather than using a uniform luminance setting
Data Source
AI summary
A region-based image display device includes a backlight module, a separating unit, a signal-processing unit, and a modulation unit. The backlight module includes several backlight regions. Each backlight region includes an adjustable luminance unit. Each luminance unit has a basis luminance value. The separating unit separates an input image signal into several image region signals corresponding to the backlight regions. The signal-processing unit transforms the image region signals into several output image signals. The modulation unit adjusts the basis luminance values to output luminance values according to the image region signals. Each basis luminance value and the corresponding image region signal on the one hand, and the corresponding output luminance value and output image signal, on the other hand, cooperatively define substantially the same chromaticity and brightness.