Laser Projection Distance Detection for Eye-Safe Brightness Control
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Solution Overview
Problem
Laser projection apparatuses emit high luminance beams that can cause eye damage when a user is positioned close to the projection screen.
Innovation Solution
A laser projection apparatus with a detecting device to determine the position of a target object relative to the apparatus, superimposing a second image on the projected image to alert the user to maintain a safe distance and adjust luminance levels based on the detected position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser projection apparatus emits high luminance beams to display projected image, then image brightness and visibility are improved, but eye damage risk increases when user is positioned close to projection screen
Solution Approach 1:
The detecting device performs preliminary detection of user position before the harmful effect can occur. When the user is detected to be within the threshold range (close to projection screen), the system preliminarily issues a warning through the second image overlay, alerting the user to move back before eye damage can occur from the high luminance beams
Solution Approach 2:
The system establishes a feedback loop by continuously detecting user position and providing real-time feedback through visual warnings. The detecting device monitors user distance, and when the threshold is exceeded, the control assembly overlays a warning image on the projection screen, creating a closed-loop safety mechanism that adjusts system behavior based on detected conditions
2Object-affected harmful factors
If detecting device and control assembly are added to monitor and adjust projection based on user position, then eye safety is improved, but device complexity increases
Solution Approach 1:
The projection screen serves multiple functions: it displays the normal projected image for viewing and simultaneously serves as a display medium for safety warnings. The control assembly performs both image processing functions and safety control functions, reducing the need for separate dedicated safety devices and minimizing overall system complexity
Solution Approach 2:
The second image acts as an intermediary communication medium between the detecting device and the user. Rather than requiring complex direct intervention mechanisms, the system uses visual information overlay as an intermediary to convey safety warnings, simplifying the control mechanism while maintaining effective safety functionality
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
Prevents eye damage by alerting users to maintain a safe distance and adjusting luminance levels, ensuring safe viewing conditions.
Implementation Method 1
The detecting device is configured to send out a detecting signal and receive the detecting signal reflected by a target object
Data Source
AI summary
A laser projection apparatus includes a housing, a detecting device, a projection screen, and a control assembly. The control assembly is configured to: determine a target position of a target object according to a detecting signal received by the detecting device at a first moment; if determining that the target position of the target object is within at least one threshold range, superimpose a second image on a first image on the projection screen, control the second image to show that the first image is adjusted after a target duration, and adjust at least one of the image content or the audio content corresponding to the projected image.