Stereoscopic Spectacles Control Device Phase Error Correction
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Solution Overview
Problem
Stereoscopic spectacles systems face issues with detecting the opening/closing timing of shutters due to phase errors caused by jitter in external synchronization signals, leading to potential misalignment and increased power consumption.
Innovation Solution
A control device and method that generate a control signal for stereoscopic spectacles with reduced phase error by detecting phase errors between external synchronization signals and the control signal, and correcting parameters to synchronize the shutter timing, using a signal generation unit, detection unit, and correction unit, which includes proportional and integral control mechanisms and filtering to adjust the shutter cycle and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external synchronization signal is used to control shutter timing, then synchronization between display and spectacles is achieved, but phase error and jitter cause detection failure of opening/closing timing
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual opening/closing timing of shutters and comparing it with the external synchronization signal to calculate phase error. This detected phase error is then fed back to correct the timing, creating a closed-loop control system that continuously adjusts to maintain accurate synchronization despite jitter in the external signal.
Solution Approach 2:
The patent introduces an intermediary detection mechanism that measures the actual shutter timing independently of the external synchronization signal. This intermediary detection system acts as a mediator between the noisy external signal and the control system, providing clean timing information for phase error calculation and correction.
2Measurement precision
If phase error correction is implemented, then timing accuracy is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The correction system uses a feedback loop that automatically detects phase error and applies correction without requiring complex manual adjustment mechanisms. The feedback-based automatic correction simplifies the overall system architecture compared to open-loop control with manual calibration.
Solution Approach 2:
The system performs self-correction by automatically detecting its own timing errors and adjusting accordingly. The spectacles control device monitors its own performance and autonomously corrects phase errors, eliminating the need for external calibration equipment or complex control infrastructure.
3Measurement precision
If proportional and integral control mechanisms are added, then phase error reduction is enhanced, but computational load and processing time increase
Solution Approach 1:
The patent transforms the phase error correction problem into parameter adjustment by modifying the timing parameters of shutter opening/closing based on detected phase error. The proportional and integral control mechanisms adjust these timing parameters dynamically, converting a complex synchronization problem into simple parameter modification that requires minimal computation.
Data Source
AI summary
A phase error detection unit measures a phase error between an external synchronization signal and a spectacles control signal that is fed back, more specifically, a discrepancy between vertical synchronization timing and shutter opening/closing timing, that is, jitter. A timing correction unit corrects the shutter opening/closing timing, using the measured jitter. Specifically, a parameter indicating the corrected shutter opening/closing timing is written to a storage unit. The storage unit stores a parameter used to generate the spectacles control signal, for example, the parameter indicating the shutter opening/closing timing. A signal generation unit generates the spectacles control signal, using the parameter stored in the storage unit. A frequency divider divides the frequency of the spectacles control signal by n.