Projector Light Source Abnormality Detection via Segmented Illuminance
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Solution Overview
Problem
Existing projector systems lack an efficient method to detect abnormalities in the light source unit, which can lead to improper operation or damage, as they rely on single-threshold illuminance values without considering time-divided segment periods and wavelength-specific illuminance patterns.
Innovation Solution
An abnormality detection unit comprising a processor, an illuminance value obtaining unit, and a light source device that emits light in time-divided segment periods, detecting an abnormal state when all illuminance values within a frame are less than a predetermined threshold, allowing for precise identification of light source issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single illuminance threshold is used for abnormality detection, then the detection process is simple, but the detection accuracy is insufficient and cannot identify light source abnormalities reliably
Solution Approach 1:
The patent divides the frame period into multiple segment periods and divides the illuminance detection into multiple threshold comparisons (first threshold for any segment, second threshold for all segments). This segmentation of the detection process enables more accurate abnormality identification by checking different conditions at different stages, resolving the contradiction between detection accuracy and process complexity.
2Reliability
If illuminance values are not checked for all segment periods, then the detection speed is faster, but the reliability of abnormality detection is reduced
Solution Approach 1:
The patent implements a two-stage detection process where the first threshold check acts as a preliminary filter. If any segment period exceeds the first threshold, the system can quickly determine normal operation without checking all segments. Only when all segments fail the first threshold does the system proceed to the second threshold check, thereby maintaining high reliability while reducing average detection time through early termination in normal cases.
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 enables accurate detection of light source abnormalities, preventing damage and ensuring safe operation by stopping the light source when necessary, while reducing the complexity of the detection process and improving the reliability of the projector system.
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 includes a light source device configured to emit light for each of segment periods that are time divided in a frame and an illuminance value obtaining unit configured to obtain an illuminance value of light emitted from the light source device and determines that the light source device is abnormal when all illuminance values obtained at the segment periods are less than a threshold.