Flash Control System for Dynamic Color Temperature Adjustment
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Solution Overview
Problem
Electronic devices with built-in flashes face challenges in adjusting illumination intensity and color temperature of the flash to match environment conditions during image capture, leading to suboptimal image quality due to inconsistent lighting.
Innovation Solution
The electronic device incorporates a flash controlling system that uses RGB sensors to detect environment conditions, adjusting the ratio of high and low color temperature LEDs in the flash to match the ambient color temperature and illumination intensity, and adjusts current levels based on distance to the subject, ensuring optimal flash settings for image capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the flash uses fixed illumination intensity and color temperature, then the device structure is simple, but the image quality deteriorates under varying environment conditions
Solution Approach 1:
The flash system dynamically adjusts its illumination characteristics by switching between high color temperature and low color temperature LEDs based on detected ambient light conditions. The system transitions from a static flash configuration to a dynamic one that adapts to environmental lighting, resolving the contradiction between structural simplicity and image quality.
Solution Approach 2:
The patent changes the color temperature parameter of the flash by selectively activating different LED types (high color temperature vs. low color temperature) based on ambient light detection. This parameter adjustment allows the flash to match environmental lighting conditions, improving image quality without requiring a completely complex controlling system.
2Manufacturing precision
If the flash adjusts illumination intensity and color temperature to match environment conditions, then image quality is improved, but the device complexity increases
Solution Approach 1:
The flash system is segmented into distinct high color temperature LED and low color temperature LED components, each optimized for specific lighting conditions. This segmentation allows the system to achieve adaptive color temperature control by simply switching between segments based on ambient light detection, avoiding the need for a single complex adjustable LED.
Solution Approach 2:
The system incorporates ambient light detection that provides feedback to the flash controlling logic. Based on the detected ambient light conditions, the system automatically determines whether to use high or low color temperature LEDs, creating a closed-loop control system that improves image quality through environment-matched illumination without requiring manual intervention.
3Device complexity
If the flash uses high color temperature LEDs only, then the flash structure is simple, but the color balance deteriorates in warm lighting conditions
Solution Approach 1:
The flash system uses a composite approach by combining both high color temperature LEDs and low color temperature LEDs in the same flash unit. This composite structure allows the system to select the appropriate LED type based on ambient lighting conditions, maintaining stable color balance across different environments while keeping the overall structure relatively simple.
4Manufacturing precision
If the flash adjusts current levels based on distance to subject, then illumination precision is improved, but the control system complexity increases
Solution Approach 1:
The system performs preliminary distance measurement and calculation before flash activation. Based on the calculated distance, the system pre-determines the appropriate current level for the LEDs, ensuring precise illumination control from the outset. This preliminary action approach simplifies the real-time control requirements during actual flash operation.
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 enables the electronic device to automatically adjust flash settings to match environment conditions, improving image quality by ensuring proper color balance and illumination, thereby enhancing the capture of images in various lighting scenarios.
Implementation Method 1
obtains a color temperature of ambient light from an RGB sensor
Implementation Method 2
the flash includes a high color temperature light-emitting diode (LED) and a low color temperature LED
Implementation Method 3
adjusting a ratio between current of the high color temperature LED and current of the low color temperature LED
Data Source
AI summary
A method for controlling a flash of an electronic device by detecting an illumination intensity and a color temperature of a current environment from a RGB sensor. When the illumination intensity is lower than a first predetermined value, a pre-flash of the flash is turned on. Control a color temperature of the pre-flash to be equal to the color temperature when the color temperature is lower than a second predetermined value. A distance between a target object and the camera is obtained, adjusting the current of the high color temperature LED and the current of the low color temperature LED simultaneously according to the obtained distance after turning on a main-flash of the flash to capture an image of the target object.