Flash LED Current Adjustment Based on Temperature
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Solution Overview
Problem
Camera flash devices in electronic devices face challenges in maintaining optimal light output due to temperature fluctuations, which affect battery impedance and voltage droop, potentially leading to reduced image quality and component shutdowns.
Innovation Solution
Implementing a temperature-sensing mechanism to dynamically adjust the power level of the flash device's light emitting diode (LED) based on sensed battery or ambient temperature, using a processor to determine appropriate current levels and adjust the LED's brightness accordingly, ensuring optimal light output while preventing battery voltage droop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the flash device operates at high power to maintain optimal light output, then illumination intensity is improved, but battery voltage droop increases and components may shut down at low temperatures
Solution Approach 1:
The patent implements dynamic power adjustment by transitioning from a static flash power approach to a dynamic one that responds to temperature conditions. The processor continuously monitors temperature and adjusts the flash power level accordingly, enabling the system to adapt its operation to prevent component shutdown while maintaining optimal performance when conditions allow.
Solution Approach 2:
The patent changes the operational parameters of the flash device based on temperature measurements. By modifying the power level parameter as a function of temperature, the system optimizes flash brightness at higher temperatures while preventing voltage droop and component shutdown at lower temperatures through reduced power consumption.
2Device complexity
If the flash device operates without temperature compensation, then device complexity is reduced, but image quality deteriorates due to inconsistent flash output
Solution Approach 1:
The patent implements a feedback mechanism where the processor monitors temperature conditions and uses this information to adjust flash power levels. This closed-loop control system ensures consistent flash output across varying temperature conditions by continuously adapting the power delivery based on real-time temperature measurements, thereby maintaining image quality.
3Reliability
If the flash power is reduced at low temperatures to prevent voltage droop, then reliability is improved, but illumination intensity decreases
Solution Approach 1:
The system dynamically adjusts flash power based on temperature conditions, transitioning from a fixed power approach to one that adapts in real-time. At low temperatures, the processor reduces power levels to prevent voltage droop and component shutdown, while at higher temperatures, it restores full power to maintain optimal illumination intensity.
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
This solution ensures better image quality by maintaining optimal flash brightness across varying temperatures, preventing component shutdowns and improving overall device performance by dynamically managing power levels based on temperature conditions.
Implementation Method 1
adjust a power level of a flash device. The flash device may include a light source and a driver. The light source may be a light emitting diode (LED)
Data Source
AI summary
A method may be provided that includes sensing a temperature, determining a current of a flash device based on the sensed temperature, and operating the flash device based on the determined current to provide light.