Adaptive Luminance Controller for Smooth LED Transitions
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Solution Overview
Problem
Rapid luminance variations from illuminating units, such as LED lights, can cause unrestorable damage to human pupils due to frequent and extreme expansions and contractions of the pupils, as they struggle to adapt to sudden changes in light levels.
Innovation Solution
A luminance controller with an A/D converter and an adaptive luminance adjusting module that generates an output luminance control signal based on a formula combining current and previous ambient luminance signals, using a rounding function to smoothly adjust the illuminating unit's luminance, preventing abrupt changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the illuminating unit switches on rapidly to provide immediate illumination, then the lighting response speed is improved, but the pupil damage risk increases due to extreme luminance variation
Solution Approach 1:
The luminance controller activates before the illuminating unit, gradually increasing luminance from an initial level to a target level over a predetermined period. This preliminary action prepares the human eyes for the upcoming light change, reducing pupil stress when the full illumination activates.
Solution Approach 2:
The system dynamically adjusts luminance levels during the transition period, continuously changing the output from initial to target luminance. This dynamic adjustment allows the lighting system to adapt to human eye adaptation capabilities while maintaining rapid overall response.
2Illumination intensity
If the luminance increases rapidly to meet lighting requirements, then the illumination effectiveness is improved, but the human eye adaptation capability deteriorates
Solution Approach 1:
The luminance controller implements periodic or continuous adjustment of luminance levels during the predetermined period. Instead of a single abrupt change, the system applies gradual increments or decrements, allowing human eyes to adapt progressively while achieving the required illumination level.
Solution Approach 2:
The ambient luminance sensor continuously detects surrounding light levels and feeds this information to the luminance controller. The controller uses this feedback to adjust the illuminating unit's output, ensuring the luminance transition is appropriate for current environmental conditions and human eye adaptation state.
3Adaptability or versatility
If the pupil expands and contracts frequently to adapt to luminance changes, then the light adaptation response is improved, but the pupil suffers unrestorable damage
Solution Approach 1:
The luminance controller provides beforehand cushioning by gradually changing luminance levels before the full illumination activates. This cushioning effect reduces the abruptness of light transitions, protecting pupils from the stress of rapid expansion and contraction while still enabling effective light adaptation.
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
The solution effectively prevents sudden increases in luminance, allowing pupils to adapt gradually, thereby protecting them from potential damage and ensuring a smoother transition between light levels.
Implementation Method 1
an ambient luminance sensor for detecting an ambient luminance of the luminance smoothening system
Data Source
Figure 1
Figure 2
AI summary
A luminance smoothening system includes an illuminating unit, an ambient luminance sensor and a luminance controller. The ambient luminance sensor detects an analog ambient luminance. The luminance controller includes an A/D converter and an adaptive luminance adjusting module. The A/D converter is electrically coupled to the ambient luminance sensor. The A/D converter receives the analog ambient luminance signal. The A/D converter transforms the analog ambient luminance signal to a digital ambient luminance signal. The adaptive luminance adjusting module is electrically coupled to the illuminating unit. The adaptive luminance adjusting module generates an output luminance control signal at a current stage based on a first adjusted ratio of the digital ambient luminance signal at the current stage and a second adjusted ratio of the output luminance control signal at a previous stage. The adaptive luminance adjusting module controls the illuminating unit using the output luminance control signal at the current stage.