Projector Light Amount Density Control for Eye Safety
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Solution Overview
Problem
Existing projector technologies using laser beam sources face challenges in preventing eye damage while ensuring comfortable video entertainment, as they often require complex monitoring systems to detect objects entering the laser beam path, leading to frequent unnecessary stops in video light output and increased complexity.
Innovation Solution
A projector design that includes a light source device, an optical element, and a detecting unit to adjust the light amount of the video light based on detection results, ensuring the light amount density is within a predetermined safe value, and using invisible detection light to prevent eye damage and simplify the monitoring configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex monitoring system is used to detect objects entering the laser beam path, then the accuracy of detecting persons or objects is improved, but the device complexity increases and unnecessary stops in video light output occur frequently
Solution Approach 1:
The patent extracts the detection function from a complex monitoring system and implements it through a simple light receiver that detects the presence of a person or object in the laser beam path. By using a minimal detection mechanism rather than a comprehensive monitoring system, the patent achieves detection accuracy while avoiding unnecessary complexity and false stops in video light output.
2Object-affected harmful factors
If the light amount density of video light is reduced to a predetermined safe value, then the safety against eye damage is improved, but the brightness of the projected image decreases
Solution Approach 1:
The patent changes the parameter of light amount density to a predetermined safe value that prevents eye damage while maintaining acceptable image brightness. This parameter optimization allows the system to operate at the boundary of safety and performance, achieving both eye protection and sufficient brightness for comfortable viewing.
3Speed
If the light amount of video light is adjusted frequently based on detection results, then the safety response speed is improved, but the comfortable video entertainment is hindered
Solution Approach 1:
The patent implements dynamic adjustment of video light amount based on real-time detection results. The system automatically increases or decreases light output in response to detected objects or changes in ambient light conditions, achieving fast safety response while maintaining comfortable viewing conditions through adaptive control rather than frequent abrupt stops.
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 solution effectively reduces eye damage risks and simplifies the monitoring system, allowing for comfortable video entertainment while maintaining a safe and efficient operation of the projector.
Implementation Method 1
a wavelength converting section that makes the light having the first wavelength, which is emitted from the light source unit, incident thereon to thereby emit the light having the first wavelength and light having a second wavelength different from the first wavelength
Implementation Method 2
a detecting unit that detects detection light supplied to the optical element
Implementation Method 3
an optical element that transmits the video light projected onto the display surface and emits the video light toward the outside of the housing
Data Source
AI summary
A projector that projects video light corresponding to an image signal onto a display surface includes: a light source device that emits light; a housing that houses at least the light source device; a projection lens, that is, an optical element that transmits the video light projected onto the display surface and emits the video light toward the outside of the housing; a detecting unit that detects detection light supplied to the optical element; and a control unit that adjusts a light amount of the video light on the basis of a result of the detection by the detecting unit. The projector is set such that, when the optical element is in a normal setting state, the light amount density of the video light is equal to or lower than a predetermined value on an emission surface for emitting the video light of the optical element.