Ambient-Light Display Brightness Control for Power Saving
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Solution Overview
Problem
Display devices consume excessive power when using fixed screen brightness in high illumination and fail to adjust brightness adequately in varying environments, leading to inconvenience.
Innovation Solution
A display device with an illumination sensor and controller that adjusts pixel luminance and color temperature based on ambient light conditions, using specific time intervals and luminance/color temperature transitions to optimize brightness and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fixed screen brightness is used, then the display device can maintain consistent luminance, but excessive power is consumed in high illumination environments
Solution Approach 1:
The display device dynamically adjusts screen brightness based on ambient illumination levels detected by the sensor. The controller modifies the luminance of pixels in real-time according to environmental lighting conditions, transitioning from fixed brightness to adaptive dynamic brightness control.
Solution Approach 2:
The illumination sensor provides feedback about ambient light conditions to the controller, which then adjusts the display brightness accordingly. This closed-loop feedback mechanism enables the system to automatically optimize power consumption while maintaining appropriate visibility.
2Illumination intensity
If screen brightness is increased for darker environments, then visibility is improved, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts screen brightness based on ambient illumination levels detected by the sensor. The controller modifies the luminance of pixels in real-time according to environmental lighting conditions, transitioning from fixed brightness to adaptive dynamic brightness control.
Solution Approach 2:
The system changes the luminance parameter of the display based on detected ambient light conditions. By adjusting this key parameter dynamically, the device optimizes visibility in dark environments while minimizing power consumption when ambient light is sufficient.
3Speed
If rapid brightness adjustment is implemented, then the display responds quickly to illumination changes, but image quality may deteriorate due to insufficient adaptation time
Solution Approach 1:
The brightness adjustment process is divided into multiple stages with different time constants. The controller applies different adjustment rates depending on the current luminance level and ambient light conditions, using faster adjustment for coarse changes and slower adjustment for fine-tuning to maintain image quality.
Solution Approach 2:
The illumination sensor periodically measures ambient light conditions and the controller adjusts brightness in controlled intervals. This periodic measurement and adjustment approach balances responsiveness with image quality stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Efficiently manages power consumption and maintains image quality by dynamically adjusting screen brightness and color temperature, reducing power waste and enhancing user experience in changing lighting conditions.
Implementation Method 1
an illumination sensor configured to measure an illumination of ambient light of the display panel
Data Source
AI summary
A display device is provided. A display panel includes pixels configured to display an image. An illumination sensor measures an illumination of ambient light of the display panel. A controller controls the display panel so that the luminance of the pixels decreases during a first time interval when the illumination of the ambient light decreases and controls the display panel so that the luminance of the pixels increases during a second time interval when the illumination of the ambient light increases. The first time interval is shorter than the second time interval.