Video Signal Selector Synchronization Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional video display systems experience video distortion when switching between video signals, leading to increased workload due to the need for video muting to synchronize signals, which can result in partial video missing or distortion during the switching process.
Innovation Solution
A semiconductor device with a first selecting portion and a selection signal generating portion that selects and outputs video signals in synchronization with their accompanying synchronization signals, preventing distortion by ensuring seamless switching without the need for video muting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the selector performs simple instant switching of video signals, then the switching speed is improved, but video distortion occurs during switching
Solution Approach 1:
The selector is configured to advance the selection timing so that the video signal selection is completed before the vertical synchronization signal period ends. This preliminary action ensures that the new video signal is ready and synchronized before the display refresh cycle completes, preventing video distortion while maintaining fast switching capability
2Reliability
If video muting is performed to prevent distortion during switching, then video display quality is improved, but system workload increases
Solution Approach 1:
The patent extracts and eliminates the video muting function from the system by implementing synchronization at the selector level. Instead of muting video during switching, the selector advances its selection timing to complete switching within the vertical sync period, removing the need for additional muting control logic and reducing system workload
3Adaptability or versatility
If the selector outputs video signal not synchronized with vertical synchronization signal, then switching flexibility is improved, but video distortion occurs
Solution Approach 1:
The selector advances the selection timing as a preliminary action to ensure that video signal switching is completed within the vertical synchronization signal period. This maintains switching flexibility for different video sources while ensuring synchronization with the display refresh cycle, preventing distortion
Data Source
AI summary
A semiconductor device includes a first selecting portion and a selection signal generating portion. The first selecting portion is configured to select one of a plurality of video signals input thereto according to a first selection signal. Further, the first selecting portion is configured to output the one of the video signals thus selected in synchronization with a synchronization signal accompanied with the one of the video signals thus selected. The selection signal generating portion is configured to generate the first selection signal.