Asynchronous Camera-Lamp Control via PWM Synchronization
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Solution Overview
Problem
Cameras built into vehicle headlamps experience image distortion due to reflected light from the lamp's light source, which affects image quality.
Innovation Solution
An asynchronous control system that integrates a camera into the headlamp, using pulse width modulation (PWM) to prevent the LED light source and camera from operating simultaneously, thereby controlling the shutter operation of the cameras and light sources to avoid distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED light source and camera operate simultaneously in the same headlamp, then the headlamp provides illumination, but the camera captures distorted images due to reflected light
Solution Approach 1:
The patent applies periodic action by using PWM control to alternately activate the LED light source and camera in time intervals. The controller generates periodic control signals that turn the LED on during certain time periods and the camera on during other time periods, ensuring they never operate simultaneously. This periodic switching resolves the contradiction by maintaining illumination functionality while preventing reflected light distortion in captured images.
Solution Approach 2:
The patent implements preliminary action by controlling the LED light source to turn off before the camera shutter opens. The controller anticipates the camera's operation and pre-adjusts the light source state to avoid reflected light interference. This preliminary coordination ensures that when the camera captures images, the LED is already in a safe state, thereby maintaining image quality while preserving illumination capability.
2Manufacturing precision
If the LED and camera are controlled to avoid simultaneous operation, then image distortion is prevented, but coordination complexity increases
Solution Approach 1:
The patent applies merging by integrating the LED driver and camera shutter control functions into a single controller. This unified controller generates both the PWM signals for the LED and the synchronization signals for the camera shutter, coordinating their operations through a centralized control logic. By merging these control functions, the system achieves precise coordination to prevent simultaneous operation while actually reducing overall system complexity compared to having separate independent control systems.
Solution Approach 2:
The patent implements feedback mechanisms where the controller monitors the operational states of both the LED light source and camera shutter. Based on this feedback information, the controller dynamically adjusts control signals to ensure proper timing coordination. This feedback-based control enables the system to maintain precise synchronization and avoid simultaneous operation automatically, reducing the need for complex manual coordination while ensuring consistent image quality.
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 approach improves image quality by preventing the camera from being affected by reflected light, ensuring clear and undistorted images by synchronizing the operation of camera shutters and light sources.
Implementation Method 1
preventing an LED and a camera from operating simultaneously in the same headlamp through pulse width modulation (PWM) control of the LED that is the light source of the headlamp
Data Source
AI summary
According to an embodiment of the present disclosure, an asynchronous control system of a camera built-in lamp may include a headlight module including a one-side headlight module integrated with a first camera and a first light source, and an other-side headlight module integrated with a second camera and a second light source, and transmits a sync signal for controlling driving of the first light source and the second light source to the one-side headlight module and the other-side headlight module, causes the first light source and the second light source to be turned off when the shutters of the first camera and the second camera operate to be opened, and causes the first light source and the second light source to be turned on when the shutters of the first camera and the second camera operate to be closed.