Dynamic Phase Timing for Camera Viewfinder Lag
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Solution Overview
Problem
In imaging display devices, particularly in mirrorless digital cameras, there is a significant delay between imaging an object and displaying it on the viewfinder, making it difficult to track moving objects and correct for lens aberrations, especially when the optical properties of the lens change, such as during zooming or lens exchange.
Innovation Solution
An imaging display device that includes an imaging unit, an image signal generating unit, and a timing control unit, which adjusts the phase difference between the imaging and display signals based on the optical properties of the lens, including focal length, zooming rate, and aberration correction time, to minimize delay and ensure proper aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant phase difference is used from imaging to display, then the device complexity is reduced, but the delay time cannot be optimized when optical properties change
Solution Approach 1:
The phase difference is made dynamic rather than constant. The timing control unit adjusts the phase difference based on zooming rate changes and optical property variations, allowing the system to optimize delay time adaptively without requiring complex manual intervention for each scenario
Solution Approach 2:
The system uses feedback from zooming rate detection and optical property monitoring to automatically adjust the phase difference. When zooming rate changes or optical properties vary, the timing control unit receives this information and modifies the phase difference accordingly, creating a closed-loop control system that reduces delay without proportionally increasing complexity
2Reliability
If the phase difference is set in expectation of maximum aberration, then aberration correction is ensured, but the delay time cannot be minimized
Solution Approach 1:
The phase difference parameter is changed dynamically based on actual optical conditions rather than being fixed for maximum aberration cases. When aberration levels are lower, the phase difference is reduced accordingly, allowing delay time to be minimized while maintaining sufficient aberration correction capability for the current optical state
Solution Approach 2:
The system transitions from a static phase difference setting to a dynamic one that adapts to changing optical properties. This allows the phase difference to be optimized in real-time based on actual aberration levels, balancing correction reliability with delay minimization
3Manufacturing precision
If image processing is performed for aberration correction, then image quality is improved, but the processing time increases delay
Solution Approach 1:
Aberration correction processing is performed in advance during the phase difference period. By utilizing the time gap between imaging and display, the system pre-processes the image data for aberration correction, so that when the image is displayed, the correction is already complete, minimizing perceived delay while maintaining image quality
Solution Approach 2:
The image processing for aberration correction is performed continuously during the phase difference interval rather than as a separate discrete step. This continuous processing utilizes every available moment in the timing gap, maximizing the use of available time while maintaining image quality
Data Source
AI summary
An imaging display device includes a lens unit, an imaging unit that outputs an imaging signal obtained by imaging, an image signal generating unit that generates an image signal by performing image processing in accordance with optical properties of the lens unit, a display unit that displays an image based on the image signal, and a timing control unit that controls the phase difference from the frame start of the imaging signal to the frame start of the image signal so as to be changed in accordance with a predetermined time required for the image processing.