Projector Light Source Abnormality Detection via Illuminance Segmentation
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Solution Overview
Problem
Existing data projector systems lack effective abnormality detection mechanisms for the light source unit, which can lead to unintended operation or damage if abnormalities occur within the projector.
Innovation Solution
An abnormality detection unit that includes a processor and a light source device, which emits light in segment periods within a frame and uses an illuminance sensor to determine if the light source is in an abnormal state by comparing illuminance values after a predetermined delay, stopping the light source if the values fall below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an illuminance sensor is used to detect light source abnormalities by comparing illuminance values across different color segments, then the reliability of abnormality detection is improved, but the device complexity increases due to the need for synchronized timing signals and multiple threshold comparisons
Solution Approach 1:
The patent divides the light emission into segment periods corresponding to different color wavelengths (red, green, blue) and compares illuminance values across these segments. By segmenting the detection process by color wavelength, the system can identify abnormalities specific to individual light sources while maintaining overall system reliability without requiring complex continuous monitoring of all colors simultaneously.
Solution Approach 2:
The patent establishes predetermined threshold ranges for illuminance values before operation begins. These thresholds are set in advance for each color segment, allowing the system to perform simple comparisons during operation rather than complex real-time analysis, thereby improving detection reliability while keeping the operational complexity low.
2Reliability
If the light source drive is stopped immediately upon detecting an illuminance value outside the threshold range, then the safety and reliability of the projector is improved, but the loss of time occurs due to interruption of normal projection operations
Solution Approach 1:
The patent implements a feedback mechanism where illuminance values are continuously monitored and compared against predetermined thresholds. When an abnormality is detected, the system provides feedback by stopping the light source drive, preventing potential damage. This feedback loop ensures safety while maintaining minimal interruption by immediately correcting the abnormal state.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting illuminance abnormalities and autonomously stopping the light source drive when thresholds are exceeded. This self-service capability improves safety by enabling the projector to detect and respond to its own abnormalities without external intervention, minimizing the need for manual monitoring and reducing overall operational downtime.
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 allows for timely detection and prevention of abnormal light source operation, reducing the risk of damage and ensuring the projector's safety and reliability.
Implementation Method 1
an output value of an illuminance sensor, which is set on a light source-side optical system in an interior of the projector, is obtained
Data Source
AI summary
An abnormality detection unit according to the invention includes a processor, and a light source device configured to emit light for each of segment periods that are time divided within a frame, and the processor obtains an illuminance value of light emitted into the frame from the light source device after a predetermined delay time has elapsed, whereupon a segment period results where a highest illuminance value is obtained, from a timing of receiving a trigger signal that is in synchronism with the frame, and detects that the light source device is in an abnormal state, when the illuminance value is less than a predetermined threshold.