Camera-Based Display Brightness Control Without Illuminance Sensors
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Solution Overview
Problem
Existing electronic devices face challenges in cost-effectively determining and adjusting the brightness of light sources, such as displays, to match ambient environments without using additional illuminance sensors, which can lead to user discomfort due to glare or difficulty in recognizing information.
Innovation Solution
An electronic device uses a camera to capture images of the ambient environment, determining the brightness by analyzing exposure conditions like aperture value, shutter speed, and ISO sensitivity, and adjusts the light source accordingly, eliminating the need for separate illuminance sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an illuminance sensor is used to sense ambient brightness, then the brightness measurement precision is improved, but the device cost and complexity increase
Solution Approach 1:
The camera module is designed to serve dual purposes: capturing images for photography purposes and sensing ambient brightness levels. By utilizing the camera's existing image sensor and processing capabilities, the system eliminates the need for a separate illuminance sensor while maintaining accurate brightness measurement for display adaptation
Solution Approach 2:
Instead of using a dedicated illuminance sensor, the system creates a virtual copy of brightness sensing functionality by processing images captured by the camera module. The exposure value and image luminance data are analyzed to derive ambient brightness information, effectively copying the sensing function through software processing rather than hardware duplication
2Illumination intensity
If the display brightness is increased to improve visibility in bright environments, then the visibility is improved, but the user experience deteriorates due to glare in normal lighting conditions
Solution Approach 1:
The display brightness is dynamically adjusted based on real-time ambient lighting conditions detected by the camera module. The system continuously monitors the environment and modifies display luminance levels accordingly, transitioning from static brightness settings to adaptive dynamic control that responds to changing lighting conditions
Solution Approach 2:
The system implements a feedback loop where the camera module continuously senses ambient brightness, the processor analyzes the exposure value and image luminance, and the display brightness is adjusted based on this feedback. This closed-loop control ensures the display brightness optimally matches the ambient environment, preventing both glare and visibility issues
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 method provides a cost-effective and efficient way to adjust light source brightness, enhancing user experience by reducing glare and improving visibility, while also simplifying the device design.
Implementation Method 1
a camera capturing an image of an ambient environment
Data Source
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AI summary
An electronic device for controlling a brightness of a light source and an operating method of the electronic device are provided. According to the electronic device and the operating method, an image including an ambient environment of a light source is captured, information of an exposure of the captured image is obtained, information about a brightness of the ambient environment of the light source is determined based on the information about the exposure, and a brightness of the light source is controlled based on the determined information about the brightness of the ambient environment.