Communication Device 4K2K Video Transmission via YCrCb 4:2:0 Sampling
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Solution Overview
Problem
The existing HDMI communication technology faces challenges in transmitting high-definition video formats like 4K2K due to increased load on the communication interface, exceeding the maximum transmission rate of general HDMI, which results in failure of video transmission.
Innovation Solution
The communication device employs a transmission method that transmits first and second color difference information for adjacent pixels through separate lines, and luminance information for each pixel through additional lines, using YCrCb 4:2:0 sampling and specific video timing formats to reduce the pixel clock and frame rate, allowing for efficient transmission of 4K2K video by halving the data requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-definition video format (4K2K) is transmitted through standard HDMI interface, then video quality is improved, but transmission rate exceeds maximum capacity of communication interface
Solution Approach 1:
The video data is segmented into different color difference information (Cb, Cr) and luminance information, which are transmitted through separate transmission lines. This segmentation allows parallel transmission of multiple data streams, effectively increasing the total transmission capacity and enabling 4K2K video transmission without exceeding the maximum transmission rate of individual HDMI channels.
Solution Approach 2:
The patent utilizes YCrCb 4:2:0 sampling format which separates color difference information from luminance information, transmitting them through different dimensions (separate transmission lines). This dimensional separation reduces the pixel clock requirement from 594 MHz to 297 MHz while maintaining video quality, effectively solving the transmission rate limitation.
2Productivity
If color difference information and luminance information are transmitted through separate lines, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The transmission device is designed with multi-functionality to handle different video formats (including 4K2K, 1080p, and other HD formats) through the same YCrCb 4:2:0 sampling and separate transmission line architecture. This universal design approach maintains data transmission efficiency across multiple video standards while managing device complexity through standardized processing pipelines.
Data Source
AI summary
One embodiment provides a communication device for transmitting a video to an external device through first to third transmission lines, the communication device including: a transmission module configured to transit first color difference information and second color difference information concerned with adjacent two pixels through the first transmission line, to transmit first luminance information concerned with one of the two pixels through the second transmission line, and to transmit second luminance information concerned with the other of the two pixels through the third transmission line.