Video Processing System Seamless Switching Without Black Screens
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Solution Overview
Problem
Existing video switching methods introduce delays and result in a poor user experience due to the need to clear hardware and software settings, leading to black screens during transitions, which fails to meet the requirements of Hybrid Broadcast Broadband TV (HbbTV).
Innovation Solution
A video processing system with a first and second decoder circuit, an access circuit, and a scaler circuit that decodes video data in advance and processes image data without changing hardware settings, allowing seamless switching between video sources by generating and processing frame parameter and image data in response to control commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the video processor circuit clears existing hardware and software settings before decoding new video content, then the video switching is performed with proper initialization, but delays are introduced during video switching resulting in black screens
Solution Approach 1:
The patent applies preliminary action by pre-decoding the second video content during the period when the panel is displaying the first video content. The decoder circuit continuously decodes incoming video data from different sources and stores the decoded content in a buffer, so that when a switching command is received, the pre-decoded content is already ready for immediate display, eliminating the need to clear settings and re-decode during the switching moment.
2Reliability
If the video processor circuit clears hardware settings during switching, then proper hardware state management is achieved, but the switching speed decreases below HbbTV requirements
Solution Approach 1:
The patent performs the decoding action in advance during the display period of the first video content. The decoder circuit is configured to decode video data from multiple sources continuously, preparing the second video content before the switching command is executed, thus achieving fast switching without compromising hardware state management.
Solution Approach 2:
The patent introduces a buffer circuit as an intermediary between the decoder circuit and the panel. The buffer temporarily stores the pre-decoded video content, allowing the system to switch between video sources rapidly by simply changing which buffer content is sent to the panel, without needing to reconfigure hardware settings during the transition.
3Speed
If the system decodes video data in advance without changing hardware settings, then switching speed increases to meet HbbTV requirements, but the complexity of managing multiple decoder states increases
Solution Approach 1:
The patent segments the video processing function into distinct decoder circuits for different video sources. Each decoder circuit independently decodes video data from its specific source, and the buffer circuit selectively outputs decoded content from different decoders based on switching commands. This segmentation allows parallel processing without complex state management in a single decoder.
Data Source
AI summary
A video switching method includes the following operations: decoding second video data during a period when a panel is driven to display image content corresponding to first video data to generate frame parameter data and image data; and processing the image data according to the frame parameter data in response to a control command to drive the panel to display image content corresponding to the second video data.