Backlight Brightness Adjustment Using Human Eye Sensitivity
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Solution Overview
Problem
Current content adaptive brightness control (CABC) technologies for mobile devices face challenges in determining the optimal amplitude for decreasing backlight brightness, leading to either insufficient image quality compensation or wasteful power consumption.
Innovation Solution
A method that calculates a screen backlight decreasable ratio considering human eye sensitivity to brightness changes, using image and environmental information to adjust pixel brightness compensation, ensuring the brightness decrease is within the minimum perceptible magnitude to maintain image quality while saving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If backlight brightness is excessively decreased to save power, then power consumption is reduced, but image quality deteriorates and becomes obviously darker
Solution Approach 1:
The patent implements a feedback mechanism by detecting ambient light brightness and using it to dynamically adjust backlight brightness. The system continuously monitors the display environment and adjusts the backlight accordingly, creating a closed-loop control system that optimizes power consumption while maintaining acceptable image quality based on actual viewing conditions.
Solution Approach 2:
The patent changes the backlight brightness parameter based on ambient light conditions and image content characteristics. By adjusting the backlight brightness parameter dynamically rather than using a fixed value, the system achieves power savings in appropriate conditions while maintaining image quality when needed, resolving the contradiction between power consumption and image quality.
2Reliability
If backlight brightness is insufficiently decreased to maintain image quality, then image quality is preserved, but power consumption increases and standby time decreases
Solution Approach 1:
The system dynamically changes the backlight brightness parameter based on ambient light detection and image content analysis. When ambient light is sufficient or image content allows, the backlight brightness is reduced to save power. This parameter adjustment resolves the contradiction by adapting power consumption to actual display requirements.
Solution Approach 2:
The patent introduces dynamic adjustment of backlight brightness based on real-time environmental and content conditions. Instead of a static brightness setting, the system continuously adapts the backlight level, enabling power savings when conditions permit while maintaining image quality when necessary, thus resolving the power consumption versus image quality trade-off.
3Loss of energy
If automatic backlight brightness adjustment is applied based on ambient light mapping, then power consumption is reduced, but fine adjustment capability is insufficient
Solution Approach 1:
The patent segments the brightness adjustment process into two distinct stages: coarse adjustment based on ambient light mapping and fine adjustment based on image content analysis. This segmentation allows the system to first establish a baseline power-saving brightness level and then refine it for optimal image quality, combining power efficiency with adjustment precision.
Solution Approach 2:
The system performs preliminary coarse adjustment of backlight brightness based on ambient light conditions before applying fine adjustments based on image content. This preliminary action establishes a power-efficient baseline that can then be optimized, allowing the system to achieve both power savings and precise brightness control.
Data Source
AI summary
A method, an apparatus, and a device for adjusting screen backlight brightness. The method includes: obtaining image information and information about an environment; determining human eye characteristic information based on the image information and the information about the environment, where the human eye characteristic information is related to a minimum magnitude of a brightness change perceptible to human eyes; obtaining information about a display screen, calculating a screen backlight decreasable ratio based on the information about the display screen, the human eye characteristic information, and the image information; and determining a screen pixel brightness compensation value based on the backlight decreasable ratio, adjusting backlight brightness based on the screen backlight decreasable ratio, and adjusting the screen pixel brightness value based on the screen pixel brightness compensation value.