Stereoscopic Projector Synchronization with Light Meter Feedback
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Solution Overview
Problem
The existing stereoscopic image projecting systems face challenges in effectively mitigating crosstalk between the left and right eyes due to mismatches between the clock phases of the synchronization signal and the timings of the left-eye and right-eye images, which are exacerbated by signal transmission delays and processing delays.
Innovation Solution
An image projecting system that includes a projector, a pair of stereoscopic glasses, and a light meter, which projects a left-right eye test image and generates multiple synchronization signals. The light meter measures brightness values through the lenses, allowing the projector to calculate light leakage values and choose an adjusted synchronization signal that aligns with the best matching signal to minimize crosstalk by ensuring the dark time coincides with the response time of the glasses or polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If dark time is incorporated to coordinate with response time for mitigating crosstalk, then crosstalk between left and right eyes is reduced, but clock phases of synchronization signal become mismatched with image display timings due to signal transmission delays
Solution Approach 1:
The system measures actual brightness values through the stereoscopic glasses lenses and feeds this information back to the projector. The projector then adjusts the synchronization signal timing based on the measured light leakage values, creating a closed-loop feedback system that compensates for transmission delays and ensures precise alignment between the synchronization signal and image display timings.
Solution Approach 2:
The system dynamically adjusts the timing parameters of the synchronization signal based on measured light leakage values. By changing the phase and timing of the synchronization signal to match the actual response characteristics of the stereoscopic glasses, the system optimizes the coordination between dark time and response time while compensating for signal transmission delays.
2Ease of operation
If standard synchronization signal timing is used, then system operation is simple, but light leakage occurs due to mismatch between dark time and response time
Solution Approach 1:
The system automatically measures light leakage values through the stereoscopic glasses and self-adjusts the synchronization signal timing without requiring manual intervention. The projector performs brightness measurements, calculates optimal timing parameters, and adjusts the synchronization signal automatically, making the system self-optimizing while maintaining ease of operation.
Solution Approach 2:
The system uses real-time brightness measurements from the stereoscopic glasses to feedback-adjust the synchronization signal timing. This feedback mechanism enables the system to automatically eliminate light leakage by coordinating dark time with the actual response time of the glasses, maintaining simple operation while achieving optimal performance.
Data Source
AI summary
An image projecting system and a synchronization method for use in the image projecting system are provided. The image projecting system comprises a projector, a pair of stereoscopic glasses and a light meter. The projector projects a left-right eye test image according to a timing, and generates a plurality of left-right eye synchronization signals according to the timing. The light meter, electrically connected to the projector, measures a plurality of left-lens brightness values and a plurality of right-lens brightness values through a left lens and a right lens of the pair of stereoscopic glasses, respectively. The projector calculates a plurality of left-lens light leakage values and a plurality of right-lens light leakage values corresponding to the left-right eye synchronization signals according to the left-lens brightness values and the right-lens brightness values, respectively, so as to choose one of the left-right eye synchronization signals as an adjusted left-right eye synchronization signal.