Air Plasma Display Laser Output Control for Observer Safety
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Solution Overview
Problem
Existing laser-based display methods that generate plasma for 2D or 3D image display in the air do not adequately protect observers and can result in frequent display stoppages due to the need for high laser output, leading to reduced practicality and safety concerns.
Innovation Solution
A display apparatus comprising a laser radiation device, an object detection device, and a control device that adjusts the laser output and display space based on detected objects, using visible laser light to form a plasma and control the scattering of light to ensure observer safety and minimize display stoppages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high output laser beam is used to generate plasma for display, then the display quality and visibility are improved, but the safety risk to observers and objects in the environment increases
Solution Approach 1:
The system performs preliminary detection of objects in the display space before initiating laser irradiation. The object detection device scans the predetermined space and identifies potential targets, allowing the control device to preemptively adjust or terminate laser output before harmful irradiation can occur, thus resolving the contradiction between achieving high display quality and preventing safety risks.
Solution Approach 2:
The system establishes a closed-loop feedback mechanism where the object detection device continuously monitors the display space during laser irradiation. When objects are detected in the predetermined space, the control device receives real-time feedback and immediately adjusts or terminates the laser output, enabling dynamic safety management while maintaining display quality when the space is clear.
2Object-affected harmful factors
If display stoppage is implemented when objects are detected in the target position, then observer protection is improved, but the frequency of display stoppage increases and practicality deteriorates
Solution Approach 1:
The system applies local quality by defining a specific predetermined space around the display position rather than stopping display for any object detection anywhere in the environment. The control device determines this localized space based on the display position and laser characteristics, allowing display to continue when objects are outside this critical zone while stopping only when objects enter the specific protected area, thus balancing observer protection with display continuity.
Solution Approach 2:
The system dynamically adjusts the display state based on real-time object detection results within the predetermined space. Rather than implementing static display stoppage, the control device continuously monitors and adapts the laser output - maintaining display when the space is clear and stopping only when objects enter the protected zone, enabling flexible and context-dependent display management that reduces unnecessary stoppages.
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
The solution effectively protects observers by dynamically controlling laser output and space, reducing the frequency of display stoppages while maintaining the ability to display images in a safe and practical manner.
Implementation Method 1
a laser radiation device configured to radiate laser light of a predetermined wavelength range to a display position in a gas to form a plasma in the display position
Implementation Method 2
form a plasma in the display position
Implementation Method 3
intensity of the laser light scattered in the display position or having passed the display position
Data Source
AI summary
A display apparatus includes a laser radiation device, an object detection device, and a control device. The laser radiation device is configured to radiate laser light of a predetermined wavelength range to a display position in a gas to form a plasma in the display position. The object detection device is configured to detect presence or absence of an object in a predetermined space. The control device is configured to determine the predetermined space on a basis of the display position and intensity of the laser light scattered in the display position or having passed the display position.