Display Subframe Clock Synchronization for Holographic Frame Omission
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Solution Overview
Problem
Conventional frame rate synchronization techniques, such as frame dropping, are inadequate for maintaining synchronization between a video stream with a low frame rate and a display device operating at a higher frame rate, leading to undesirable frame omission in holographic projections.
Innovation Solution
A display system that adjusts its subframe rate by extending the duration of specific clock reset signals between frames, allowing continuous synchronization without frame dropping, by using a second clock signal with varying reset times to match the frame rate of the video stream, ensuring each frame is displayed as multiple subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame dropping is used to synchronize video stream with display device, then synchronization is restored, but frames are omitted leading to loss of information
Solution Approach 1:
The patent applies dynamics by making the display device adaptive to the video stream's frame rate rather than forcing the video stream to match the display device's fixed frame rate. The system dynamically adjusts by dividing each video frame into multiple subframes, allowing the display device to operate at its native high frame rate while preserving all video frame information. This resolves the contradiction by eliminating frame dropping while maintaining synchronization through dynamic subframe generation.
Solution Approach 2:
The patent applies segmentation by dividing each video frame into multiple subframes that are displayed sequentially at the display device's higher frame rate. This segmentation allows the system to maintain the original video frame rate while utilizing the display device's capabilities, thereby preserving all frame information without omission and achieving synchronization through temporal subdivision of display events.
2Manufacturing precision
If display device operates at high frame rate, then display quality is improved, but frame synchronization with low frame rate video stream becomes difficult
Solution Approach 1:
The system dynamically adapts to the video stream's frame rate while maintaining the display device's high operating frame rate. By making the display device adaptive rather than forcing adaptation of the video stream, the system achieves both high display quality through full utilization of display capabilities and reliable synchronization through dynamic subframe generation for each incoming video frame.
Solution Approach 2:
The patent applies preliminary action by pre-dividing each video frame into multiple subframes before display. This preliminary segmentation prepares the frame data in advance, allowing the display device to operate at its optimal high frame rate while ensuring precise synchronization with the incoming video stream without requiring complex real-time adjustment during display operations.
3Adaptability or versatility
If asynchronous mode is used for frame rates, then flexibility is improved, but synchronization drift occurs over time
Solution Approach 1:
The patent applies feedback by continuously monitoring the timing relationships between video frame arrivals and display subframe generation. This feedback mechanism allows the system to maintain precise synchronization over time by adjusting subframe timing based on actual frame rate variations, thereby preserving both the flexibility of asynchronous operation and reliable long-term synchronization without drift.
Data Source
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AI summary
A display system arranged to receive a video stream of frames for display. The frame rate of the video stream is defined by a first clock signal comprising a plurality of first clock reset signals (between frames). A subframe rate of the display system is defined by a second clock signal comprising a plurality of second clock reset signals (between subframes). The second clock reset signals define n subframes for each frame of the video stream. That is, the subframe rate of the display system is n times faster than the frame rate of the video stream. The display system is arranged so that duration of every nth second clock reset signal is different to the duration of the other second clock reset signals such that synchronization between frames of the video stream and subframes of the display device is maintained.