Image Display Synchronization via Blanking Interval Adjustment
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Solution Overview
Problem
Existing methods for synchronizing image signals from different sources in motor vehicles are either prone to disturbances, require excessive memory, or lack failure protection, making them unsuitable for reliable and efficient use in vehicle displays.
Innovation Solution
A method that synchronizes image signals by modifying the temporal position of the blanking intervals of one signal relative to the other, allowing for 'loose' synchronization during blanking intervals, which can be achieved with minimal memory requirements and independent timing of the devices, enabling precise synchronization and fast stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large RAM memory is provided in the display device with triple buffering, then the freedom from interference and protection against failure is achieved, but the memory requirement becomes very high (about 2.3 MBytes for WVGA frame)
Solution Approach 1:
The patent extracts the synchronization function from the display device itself and implements it in the video source device. By generating the synchronization signal externally and providing it to the display device, the need for large buffer memories in the display device is eliminated, while still achieving reliable synchronized operation.
2Quantity of substance
If simple solutions are used where video sink is driven in slave mode through common clock signal, then the memory requirement is minimum (one FIFO of one line), but the lack of failure protection and start-up problems occur
Solution Approach 1:
The patent implements preliminary synchronization by generating the synchronization signal in advance in the video source device before the display device needs to use it. This allows the display device to be properly synchronized from the start, avoiding start-up disturbances and providing failure protection without requiring complex memory structures.
3Device complexity
If unsynchronized display approach is used where current image is continuously stored and displayed, then the implementation is simple, but disturbances occur in the display because no complete images can be utilized
Solution Approach 1:
The patent implements a feedback mechanism where the synchronization signal generated from the video source is used to control the timing of image display. This feedback loop ensures that complete images are displayed without disturbances, while maintaining relatively simple implementation through the use of a synchronization signal rather than complex buffering.
Data Source
AI summary
A method and a device for synchronizing an image display, a first image signal being provided by a first device and a second image being provided by a second device being brought together for display, the first device and the second device being time-controlled independently of each other. The second image signal is synchronized with the first image signal by modifying a blanking interval of the second image signal.