Projector Cover Glass Integrity Detection Using Conductive Layers
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Solution Overview
Problem
Projectors used for obtaining 3D images with infrared laser modules pose a risk if their cover glass is broken, as the high-power laser beam can be harmful to users without detection.
Innovation Solution
An electronic device with a projector and controller that determines if the cover glass is broken by analyzing the resistance or capacitance of the conductive layers on the glass, and adjusts the power of the laser module accordingly to prevent harm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the laser module operates at high power to generate 3D images, then the image quality and depth sensing capability are improved, but the risk of laser beam harm to human eyes increases if the cover glass is broken
Solution Approach 1:
The system performs preliminary detection of cover glass integrity using conductive layers and resistance/capacitance measurement before operating the laser module at high power. This advance detection prevents the harmful situation from occurring in the first place.
Solution Approach 2:
The controller continuously monitors the resistance or capacitance values from the conductive layers and provides feedback to adjust the laser module power. When cover glass damage is detected, the system automatically reduces or turns off the laser power to prevent harm.
2Illumination intensity
If the cover glass is made transparent to allow laser beam passage, then the projected image quality is improved, but the detection of cover glass breakage becomes more difficult
Solution Approach 1:
Conductive layers are introduced as intermediary elements on the cover glass surface. These layers serve as sensors that detect cover glass integrity through electrical measurements (resistance or capacitance) without interfering with the optical transparency needed for laser beam passage and image projection.
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
Effectively controls the projector's power to prevent high-power laser exposure when the cover glass is damaged, ensuring user safety by reducing or turning off the laser beam.
Implementation Method 1
determining if the cover glass is broken by analyzing the resistance or capacitance of the conductive layers on the glass
Implementation Method 2
determining if the cover glass is broken by analyzing the resistance or capacitance of the conductive layers on the glass
Implementation Method 3
a laser module and a lens module with a cover glass, wherein a laser beam generated from the laser module passes through the lens module to generate a projected image
Data Source
AI summary
The present invention provides an electronic device, wherein the electronic device includes a projector and a controller. The projector includes a laser module and a lens module with a cover glass, wherein a laser beam generated from the laser module passes through the lens module to generate a projected image. The controller is coupled to the projector, and is arranged for determining if the cover glass is broken to generate a determination result, and controlling a power of the laser module according to the determination result.