Illumination Device Brightness Control via Ambient Light PWM
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Solution Overview
Problem
Advanced driving assistance systems (ADAS) with driver monitoring systems (DMS) face challenges in maintaining optimal image brightness in varying ambient light conditions, requiring effective brightness control of illumination devices to enhance display quality without excessive power consumption.
Innovation Solution
A brightness control method and system that detect ambient light levels, calculate supplementary light needs, and generate pulse signals to control illumination devices, optimizing power usage by turning devices on or off as necessary, using a formula to determine the required power and duty cycle for efficient light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the illumination device is continuously operated to maintain image brightness, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using pulse width modulation (PWM) to control the illumination device. The controller generates pulse signals with varying duty cycles to periodically switch the illumination device on and off, achieving average brightness control without continuous operation. This reduces power consumption while maintaining required image brightness levels.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the duty cycle of PWM signals based on ambient light conditions detected by the ambient light sensor. The system continuously adapts the illumination device's operation state according to real-time environmental changes, optimizing the balance between image brightness and power consumption.
2Illumination intensity
If the illumination device operates at high brightness to ensure image quality, then display effect is improved, but energy expenditure increases
Solution Approach 1:
The patent employs feedback by using an ambient light sensor to continuously monitor environmental light conditions and feed this information back to the controller. The controller adjusts the illumination device's brightness accordingly, ensuring optimal display effect only when necessary, thereby reducing unnecessary energy expenditure.
Solution Approach 2:
The patent applies parameter changes by varying the duty cycle parameter of PWM signals to control illumination intensity. Instead of operating at fixed high brightness, the system dynamically changes the duty cycle parameter based on ambient light levels, achieving required display effects while minimizing energy loss.
3Use of energy by moving object
If the illumination device is controlled with simple on/off switching, then power consumption is reduced, but image brightness control precision deteriorates
Solution Approach 1:
The patent uses periodic action through PWM technology to achieve precise brightness control. Instead of simple on/off switching, the system employs high-frequency pulse modulation with variable duty cycles, enabling fine-grained brightness adjustment while maintaining low average power consumption.
Data Source
AI summary
A brightness control method of an illumination device includes: obtaining a brightness of ambient light, determining an amount of supplementary light according to the brightness of the ambient light and target brightness if the brightness of the ambient light is less than the target brightness, and generating a first pulse signal according to the amount of supplementary light to control the illumination device to emit light.