Video Processing Circuit Merging Streams via LVDS Bandwidth
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Solution Overview
Problem
Conventional video processing circuits face challenges in enhancing video quality while transmitting video output streams with auxiliary graphics, as existing methods either result in poor quality around graphic data areas due to simultaneous post-processing or require additional I/O pins for separate transmission of graphic data.
Innovation Solution
A video processing circuit with a communication interface circuit that allows for merging video output streams with graphical streams through different modes, utilizing bandwidth efficiently by compressing or increasing frequency, or using video control signals to transmit graphical data without additional I/O pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If video output stream and graphic data are mixed into a single mixed data by a conventional mixer, then the transmission is simplified through a single channel, but the video quality around edges of graphic data area becomes poor due to uniform post-processing
Solution Approach 1:
The patent segments the transmission channel into two separate channels: a first channel for video output stream and a second channel for graphic data. This allows independent post-processing of each channel, preventing the quality degradation that occurs when both are processed uniformly in a single channel. The segmentation enables the video enhancement to be applied only to the video stream without affecting graphic data quality.
Solution Approach 2:
The patent applies different post-processing schemes to different data streams based on their specific requirements. The video output stream receives video enhancement processing while the graphic data stream receives different or no enhancement, ensuring that each type of data is processed with the appropriate quality parameters for its specific characteristics.
2Manufacturing precision
If video output stream and graphic data are transmitted separately through additional I/O pins, then the video quality is maintained, but the device complexity and pin count increase
Solution Approach 1:
The patent merges the transmission of video output stream and graphic data into a unified transmission interface by utilizing different channels of the same LVDS transmitter. This approach maintains the quality benefits of separate transmission while avoiding the need for additional external I/O pins, as both channels share the same physical transmission pathway with differential signal pairs.
3Productivity
If bandwidth is increased to transmit both video and graphical streams simultaneously, then the transmission capacity is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent employs time-division multiplexing where the LVDS transmitter alternates between transmitting video output stream on the first channel and graphic data on the second channel. This periodic transmission approach allows both data types to share the same bandwidth resources efficiently without requiring simultaneous high-bandwidth allocation, reducing overall device complexity while maintaining full transmission capacity.
Data Source
AI summary
A video processing circuit includes a video generating unit for generating a video output stream, a data generating unit (e.g. graphic generating unit) for providing a data stream (e.g. graphical stream), and a communication interface circuit. The communication interface circuit has a mode provided for merging the video output stream and the graphical stream to transmit a first merged signal through a channel. In the mode, the communication interface circuit merges the video output stream and the data stream by increasing a working frequency of the communication interface circuit to increase bandwidths of the channel, using positions for transmitting a portion of video control signals in the video output stream to transmit the data stream, and compressing the video output stream. The communication interface circuit may have another mode provided for mixing the video output stream and the data stream to transmit a mixed video output stream through the channel.